Corrosion cell on electrochemistry

Question

Write the equations of selective corrosion of the alloy Cu/Zn in a neutral medium and in a medium of H3PO4.

Answer 1

Not entirely certain about the following answer, but since there have been no other suggestions, I proffer the following possibilities.

Corrosion is the degradation of a metal from interacting with the surroundings. Usually, this is oxidation. So, if we have Cu and Zn, according to the activity series and standard reduction potentials, the Zn will be preferentially oxidized by the oxygen in the air.

In a neutral medium (environment), maybe something like this...

Zn ==> Zn²⁺ + 2e-

1/2 O₂ + 2e- ==> O^2-

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Zn + 1/2 O₂ ==> ZnO

In an acidic medium (environment), maybe something like this...

Zn ==> Zn²⁺ + 2e-

2H⁺ + 2e- ==> H₂

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Zn + 2H⁺ ==> Zn²⁺ + H₂

Will be curious to see what others think, as I'm uncertain what might happen with the Cu in the alloy. This may be an area for a metallurgist.