Question

The rate of corrosion of iron in atmosphere depends on

Answer 1

Answer:

oxygen, temperature, ph value and diffusion

Explanation:

Answer 2

The rate of corrosion of iron in atmosphere depends on fast oxygen reduction at the electron-conducting large surface area oxide cathode

Explanation:

During drying, oxygen diffuses rapidely into the pore system of the oxide scale by gas diffusion. Then the corrosion rate is increased dramatically due to the fast oxygen reduction at the electron-conducting large surface area oxide cathode. Due to the fast corrosion a dense oxide layer is formed on top of the metal surface and the surface is passivated. The corrosion stage of drying is terminated by a re-oxidation of the oxide scale by oxygen, which causes the rate of the oxygen reduction to decrease as the electronic conductivity of the oxide scale is reduced.

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