alleryStart learning →A protective oxide layer that stops further corrosion is formed by a process called:
AElectroplating
BSublimation
CPassivation
DGalvanisation
Answer & Solution
Correct answer: C. Passivation
1. Some metals corrode once and then stop, because the product seals the surface.
2. The formation of the protective layer is called passivation.
3. Copper's patina behaves this way, sealing the metal beneath it.
4. Rust does not, so corrosion of iron continues as the rust flakes off and exposes fresh iron.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 17 'Electrochemistry', sections 17.1-17.7_
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