{"id":1812,"date":"2024-07-30T19:44:30","date_gmt":"2024-07-30T19:44:30","guid":{"rendered":"https:\/\/svestudy.com\/?page_id=1812"},"modified":"2025-05-11T10:54:39","modified_gmt":"2025-05-11T10:54:39","slug":"ame-unit-6-q5","status":"publish","type":"page","link":"https:\/\/svestudy.com\/?page_id=1812","title":{"rendered":"AME Unit 7 Q2"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1023\" height=\"218\" src=\"https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-329.png\" alt=\"\" class=\"wp-image-6163\" srcset=\"https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-329.png 1023w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-329-300x64.png 300w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-329-768x164.png 768w\" sizes=\"auto, (max-width: 1023px) 100vw, 1023px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">With reference to marine corrosion:<br>(a) list EIGHT factors that influence the rate of corrosion for an unprotected metal surface;(4)<br>(b) explain the process of galvanic corrosion;(4)<br>(c) state TWO major factors influencing the severity of galvanic corrosion.(2)<\/p>\n\n\n<div class=\"wp-block-ub-content-toggle wp-block-ub-content-toggle-block\" id=\"ub-content-toggle-block-e39addb6-e461-41a5-9872-881fa9f610f0\" data-mobilecollapse=\"true\" data-desktopcollapse=\"true\" data-preventcollapse=\"false\" data-showonlyone=\"false\">\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-3e4dd2af-965d-4878-9bf4-73bd2742fedf\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-0-e39addb6-e461-41a5-9872-881fa9f610f0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-e39addb6-e461-41a5-9872-881fa9f610f0\" style=\"color: #000000; \">Factors Influencing Corrosion Rate in Marine Environments<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-0-e39addb6-e461-41a5-9872-881fa9f610f0\">\n\n<p class=\"wp-block-paragraph\">The rate of corrosion on an unprotected metal surface in a marine environment is influenced by a combination of factors. These can be categorized into: \u00a0<a href=\"https:\/\/www.researchgate.net\/publication\/229397040_Influence_of_environmental_factors_on_corrosion_of_ship_structures_in_marine_atmosphere#:~:text=The%20initiation%20and%20development%20of,temperature%2C%20dissolved%20oxygen%2C%20pH%20and\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.researchgate.net\/publication\/229397040_Influence_of_environmental_factors_on_corrosion_of_ship_structures_in_marine_atmosphere#:~:text=The%20initiation%20and%20development%20of,temperature%2C%20dissolved%20oxygen%2C%20pH%20and\" target=\"_blank\" rel=\"noreferrer noopener\">1. Influence of environmental factors on corrosion of ship structures in marine atmosphere | Request PDF &#8211; ResearchGate <\/a><a href=\"https:\/\/www.researchgate.net\/publication\/229397040_Influence_of_environmental_factors_on_corrosion_of_ship_structures_in_marine_atmosphere#:~:text=The%20initiation%20and%20development%20of,temperature%2C%20dissolved%20oxygen%2C%20pH%20and\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/publication\/229397040_Influence_of_environmental_factors_on_corrosion_of_ship_structures_in_marine_atmosphere#:~:text=The%20initiation%20and%20development%20of,temperature%2C%20dissolved%20oxygen%2C%20pH%20and\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Environmental Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Oxygen Concentration:<\/strong> Higher oxygen levels accelerate corrosion. \u00a0 <a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Dissolved oxygen corrosion <\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\">www.corrosion-doctors.org<\/a><a href=\"https:\/\/www.corrosion-doctors.org\/Cooling-Water-Towers\/dissolvedoxygen.htm#:~:text=Dissolved%20oxygen%20can%20destroy%20the,dissolved%20ions%20into%20insoluble%20forms.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Temperature:<\/strong> Increased temperature generally increases corrosion rate. \u00a0 <a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\">1. Effect of temperature on the corrosion rate and potentiodynamic&#8230; &#8211; ResearchGate <\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\">www.researchgate.net<\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-temperature-on-the-corrosion-rate-and-potentiodynamic-polarization-curves-of_fig1_356021209\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Salinity:<\/strong> Higher salinity (salt content) in seawater increases conductivity and corrosion rate.<\/li>\n\n\n\n<li class=\"\"><strong>pH Level:<\/strong> The acidity or alkalinity of the seawater affects corrosion rates. \u00a0 <a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Effect of the pH on the corrosion rate | Download Scientific Diagram &#8211; ResearchGate <\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\">www.researchgate.net<\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-the-pH-on-the-corrosion-rate_fig2_238739911#:~:text=Many%20studies%20found%20that%20a,%5D%5B68%5D%20%5B69%5D%20.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Hydrodynamic Conditions:<\/strong> Water flow and turbulence can influence the rate and type of corrosion. \u00a0 <a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\">1. Corrosion of welded components in marine environments (April 2003) &#8211; TWI Global <\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\">www.twi-global.com<\/a><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/corrosion-of-welded-components-in-marine-environments-april-2003\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Marine Organisms:<\/strong> Biofouling (attachment of marine organisms) can accelerate corrosion. \u00a0 <a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\">1. Understanding biofouling and contaminant accretion on submerged marine structures | npj Materials Degradation &#8211; Nature <\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\">www.nature.com<\/a><a href=\"https:\/\/www.nature.com\/articles\/s41529-023-00370-5#:~:text=Beyond%20enabling%20the%20build%2Dup,also%20increases%20the%20risk%20of\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Metallurgical Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Metal Composition:<\/strong> Different metals have varying corrosion resistance. \u00a0 <a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Metals That Are Corrosion-Resistant: An In-depth Guide &#8211; KDM Fabrication <\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\">kdmfab.com<\/a><a href=\"https:\/\/kdmfab.com\/metals-that-are-corrosion-resistant\/#:~:text=are%20more%20prone.-,%C2%A7%20Corrosion%20Resistance%20Ratings,like%20ASTM%20G48%20measure%20this.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Impurities:<\/strong> Impurities in the metal can act as nucleation sites for corrosion.<\/li>\n\n\n\n<li class=\"\"><strong>Microstructure:<\/strong> The microstructure of the metal affects its susceptibility to corrosion. \u00a0 <a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\">1. Microstructure Evolution and Localized Corrosion Susceptibility of an Al-Zn-Mg-Cu-Zr 7xxx Alloy with Minor Cr Addition &#8211; MDPI <\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\">www.mdpi.com<\/a><a href=\"https:\/\/www.mdpi.com\/1996-1944\/16\/3\/946\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Surface Condition:<\/strong> Surface roughness, scratches, and other imperfections can accelerate corrosion. \u00a0 <a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\">1. The Relationship Between Surface Roughness and Corrosion &#8211; ResearchGate <\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\">www.researchgate.net<\/a><a href=\"https:\/\/www.researchgate.net\/publication\/267596825_The_Relationship_Between_Surface_Roughness_and_Corrosion#:~:text=Surface%20roughness%20of%20the%20metal,and%20pitting%20potential%20as%20well.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Electrochemical Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Electrolyte Conductivity:<\/strong> Seawater is a highly conductive electrolyte, facilitating corrosion reactions. \u00a0 <a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Test whether solutions formed by ionic or covalent bonds show more electrical resistance <\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\">www.britannica.com<\/a><a href=\"https:\/\/www.britannica.com\/video\/163293\/current-solution-electrolytes#:~:text=In%20this%20sample%20of%20salt,more%20conductive%20than%20pure%20water.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Electrode Potential:<\/strong> The difference in potential between the metal and its environment affects the corrosion rate.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By understanding these factors, it is possible to select appropriate materials, apply protective coatings, and implement corrosion prevention strategies to mitigate the effects of marine corrosion.<\/p>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-3e4dd2af-965d-4878-9bf4-73bd2742fedf\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-1-e39addb6-e461-41a5-9872-881fa9f610f0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-e39addb6-e461-41a5-9872-881fa9f610f0\" style=\"color: #000000; \">Galvanic Corrosion Process<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-1-e39addb6-e461-41a5-9872-881fa9f610f0\">\n\n<p class=\"wp-block-paragraph\"><strong>Galvanic corrosion<\/strong> occurs when two dissimilar metals are in electrical contact and immersed in an electrolyte, such as seawater. This electrochemical process accelerates the corrosion of one metal (the anode) while protecting the other (the cathode).<\/p>\n\n\n\n<h3 class=\" wp-block-heading\">The Process:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"\"><strong>Electrolyte:<\/strong> Seawater acts as an electrolyte, providing a conductive medium for ion movement.<\/li>\n\n\n\n<li class=\"\"><strong>Electrode Formation:<\/strong> The more active metal becomes the anode, while the less active metal becomes the cathode.<\/li>\n\n\n\n<li class=\"\"><strong>Ion Exchange:<\/strong> The anode metal releases ions into the electrolyte, creating an electric current.<\/li>\n\n\n\n<li class=\"\"><strong>Electron Flow:<\/strong> Electrons flow from the anode to the cathode through the metallic connection.<\/li>\n\n\n\n<li class=\"\"><strong>Corrosion:<\/strong> The anode metal corrodes as it loses electrons and ions, while the cathode is protected.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"noreferrer noopener\" href=\"https:\/\/byjus.com\/chemistry\/galvanic-corrosion\/\">Opens in a new window<\/a><a target=\"_blank\" rel=\"noreferrer noopener\" href=\"https:\/\/byjus.com\/chemistry\/galvanic-corrosion\/\">byjus.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">galvanic corrosion process<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key factors:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Metal Potential Difference:<\/strong> The greater the difference in the electrochemical series between the two metals, the more severe the corrosion.<\/li>\n\n\n\n<li class=\"\"><strong>Electrolyte Conductivity:<\/strong> Higher conductivity accelerates the corrosion process.<\/li>\n\n\n\n<li class=\"\"><strong>Surface Area Ratio:<\/strong> A larger anode compared to the cathode intensifies corrosion.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding this process is crucial for preventing galvanic corrosion in marine environments.<\/p>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-3e4dd2af-965d-4878-9bf4-73bd2742fedf\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-2-e39addb6-e461-41a5-9872-881fa9f610f0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-e39addb6-e461-41a5-9872-881fa9f610f0\" style=\"color: #000000; \">Factors Influencing the Severity of Galvanic Corrosion<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-2-e39addb6-e461-41a5-9872-881fa9f610f0\">\n\n<p class=\"wp-block-paragraph\">Several factors contribute to the severity of galvanic corrosion:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Electrode Potential Difference:<\/strong> The greater the difference in electrode potential between the two metals, the more severe the corrosion. \u00a0 <a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Corrosion.html <\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\">www1.udel.edu<\/a><a href=\"http:\/\/www1.udel.edu\/db\/Mas%20note\/Notes\/Corrosion.html#:~:text=It%20is%20this%20voltage%20difference,taken%20directly%20from%20Table%201.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Metal Surface Area:<\/strong> A larger surface area of the anode relative to the cathode accelerates corrosion.<\/li>\n\n\n\n<li class=\"\"><strong>Metal Composition:<\/strong> Impurities and alloying elements can influence the corrosion rate.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Environmental Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Electrolyte Conductivity:<\/strong> Higher conductivity of the electrolyte (e.g., seawater with high salinity) increases corrosion rate.<\/li>\n\n\n\n<li class=\"\"><strong>Oxygen Concentration:<\/strong> Higher oxygen levels can accelerate corrosion.<\/li>\n\n\n\n<li class=\"\"><strong>Temperature:<\/strong> Increased temperature often intensifies corrosion rates. \u00a0 <a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Factors Influencing Galvanic Corrosion &#8211; Mypdh.engineer <\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\">mypdh.engineer<\/a><a href=\"https:\/\/mypdh.engineer\/lessons\/factors-influencing-galvanic-corrosion\/#:~:text=The%20main%20driving%20force%20for,is%20given%20in%20Equation%205.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Fluid Velocity:<\/strong> Higher fluid velocity can increase the rate of corrosion due to increased oxygen availability. \u00a0 <a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Effect of velocity on the corrosion rate of mild steel immersed in aerated DI water. <\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\">www.researchgate.net<\/a><a href=\"https:\/\/www.researchgate.net\/figure\/Effect-of-velocity-on-the-corrosion-rate-of-mild-steel-immersed-in-aerated-DI-water_fig4_261133505#:~:text=The%20increasing%20velocity%2C%20increases%20the,the%20cathodic%20reaction%2C%20oxygen%20reduction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Design Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Insulation:<\/strong> Proper insulation between dissimilar metals can significantly reduce galvanic corrosion. \u00a0 <a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\">1. Galvanic corrosion <\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\">galvanizing.org.uk<\/a><a href=\"https:\/\/galvanizing.org.uk\/corrosion\/galvanic-corrosion\/\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Sacrificial Anodes:<\/strong> Using sacrificial anodes can protect the primary structure. \u00a0 <a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Sacrificial Anode &#8211; Chemistry LibreTexts <\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\">chem.libretexts.org<\/a><a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Exemplars\/Corrosion\/Sacrificial_Anode#:~:text=name%20three)-,Answers,protect%20metal%20structures%20from%20corroding.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Cathodic Protection:<\/strong> Applying an external current to protect the structure can mitigate corrosion. \u00a0 <a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Cathodic Protection (CP) for Corrosion Control &#8211; AMPP <\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\">www.ampp.org<\/a><a href=\"https:\/\/www.ampp.org\/technical-research\/what-is-corrosion\/cathodic-protection-for-corrosion-control#:~:text=It's%20accomplished%20by%20sending%20a,surface%20in%20an%20electronegative%20direction.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By understanding these factors, engineers can design and maintain systems to minimize the risk of galvanic corrosion.<\/p>\n\n<\/div>\n\t\t<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>With reference to marine corrosion:(a) list EIGHT factors that influence the rate of corrosion for an unprotected metal surface;(4)(b) explain the process of galvanic corrosion;(4)(c) state TWO major factors influencing the severity of galvanic corrosion.(2)<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"templates\/template-full-width.php","meta":{"nf_dc_page":"","footnotes":""},"class_list":["post-1812","page","type-page","status-publish","hentry"],"featured_image_src":null,"_links":{"self":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/1812","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1812"}],"version-history":[{"count":5,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/1812\/revisions"}],"predecessor-version":[{"id":9811,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/1812\/revisions\/9811"}],"wp:attachment":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}