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Questions and Answers
What is the result of direct combination between the metal and the environment in chemical passivity?
What is the result of direct combination between the metal and the environment in chemical passivity?
- No change in the corrosion rate
- Increase in the rate of corrosion
- Formation of insoluble compound (passive film) on the metal surface (correct)
- Formation of soluble compound on the metal surface
Which metal is protected from further corrosion by the presence of a very thin and transparent Al2O3 layer on its surface?
Which metal is protected from further corrosion by the presence of a very thin and transparent Al2O3 layer on its surface?
- Nickel (Ni)
- Aluminum (Al) (correct)
- Chromium (Cr)
- Iron (Fe)
What defines passivity in the case of active anodes such as Fe, Ni, Cr, and Ti?
What defines passivity in the case of active anodes such as Fe, Ni, Cr, and Ti?
- Passivity below Epass
- Increase in corrosion rate above Epass
- Formation of thick protective oxide layer
- Corrosion resistance above a critical anodic passive potential Epass (correct)
What acts as a barrier on the anodic dissolution reaction in the formation of passivity for active anodes?
What acts as a barrier on the anodic dissolution reaction in the formation of passivity for active anodes?
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In what state do metals and alloys exist above the critical potential Epass?
In what state do metals and alloys exist above the critical potential Epass?
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