Correct Answer:
B. Fretting corrosion happens when two metal surfaces are subjected to repeated small oscillatory motions, leading to the wear of the protective oxide layer and localized corrosion.
Explanation:
- B. Correct: Fretting corrosion is characterized by the damage and corrosion that occurs when two metal surfaces experience repeated, small oscillatory movements. These movements can wear away the protective oxide layer, exposing fresh metal surfaces to the environment, which then leads to localized corrosion.
- A. Incorrect: While high temperatures can influence corrosion, fretting corrosion specifically involves mechanical movement between metal surfaces rather than just exposure to high temperatures.
- C. Incorrect: General corrosion in seawater is not the same as fretting corrosion. Fretting corrosion involves mechanical movement and wear, not just exposure to seawater.
- D. Incorrect: The application of high-pressure steam might lead to different types of corrosion or degradation, but fretting corrosion is related to mechanical movement between metal surfaces, not steam exposure.
Correct Answer:
B. Fretting corrosion happens when two metal surfaces are subjected to repeated small oscillatory motions, leading to the wear of the protective oxide layer and localized corrosion.
Explanation:
- B. Correct: Fretting corrosion is characterized by the damage and corrosion that occurs when two metal surfaces experience repeated, small oscillatory movements. These movements can wear away the protective oxide layer, exposing fresh metal surfaces to the environment, which then leads to localized corrosion.
- A. Incorrect: While high temperatures can influence corrosion, fretting corrosion specifically involves mechanical movement between metal surfaces rather than just exposure to high temperatures.
- C. Incorrect: General corrosion in seawater is not the same as fretting corrosion. Fretting corrosion involves mechanical movement and wear, not just exposure to seawater.
- D. Incorrect: The application of high-pressure steam might lead to different types of corrosion or degradation, but fretting corrosion is related to mechanical movement between metal surfaces, not steam exposure.