Discussion
A differential aeration cell forms corrosion at the part of the metal that is
Answer: C
Correct answer: poorly supplied with oxygen
This is the result that seems backwards until the cell is drawn out. The well-aerated area supports the cathodic reduction of oxygen, so the poorly aerated area is left to be the anode, and it is the anode that dissolves. Crevices, gasket faces, the underside of a deposit and the metal below the waterline are all attacked for exactly this reason.
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