Home › AP Chemistry › Chemistry › Electrochemistry › A protective oxide layer that stops further corr…
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_
Related questions
Reducing chromium(III) to chromium metal requires how many moles of electrons per mole of Electrolysing neutral aqueous sodium chloride reduces water rather than hydrogen ion becauTo drive a nonspontaneous cell reaction, the applied voltage must be:A sacrificial anode protects iron because the anode metal has a reduction potential that iRust differs from copper patina in that the rust layer:The blue-green patina on outdoor copper structures forms because copper oxides react with:Compared with an internal combustion engine, a fuel cell using the same reaction is typicaA lead acid car battery reaches 12 volts because it connects in series: