Discussion
The oxygen absorption mechanism of wet corrosion has as its cathodic reaction the reduction of
Answer: A
Correct answer: oxygen to hydroxyl ions
In neutral or alkaline solution the cathodic half-reaction is \[ \mathrm{O_2 + 2H_2O + 4e^- \rightarrow 4OH^-}, \] which is why this mechanism is called oxygen absorption. Hydrogen evolution is the competing mechanism and takes over only in acid, where hydrogen ions are plentiful enough to be reduced instead.
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