Explanation:
The corrosion of iron is an electrochemical process. The anode region and cathode region are present in iron. Iron(II) is oxidized to Iron(III) by oxygen and is then converted to rust. At the cathode, oxygen is reduced. The electron flow is from anode to cathode through metal. This is accompanied by the flow of ions through water droplets.
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$\,\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,COOH}\\
{\,\,\,\,\,\,\,\,\,|}\\
{\mathop {N{H_3}}\limits^{\,\, \oplus } - C - H}\\
{\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,R}
\end{array}\,\,\,$
