MCQ
According to the electrochemical concept, corrosion occurs at:
- ✓Anodic area of metal.
- BCathodic area of metal.
- CBoth cathodic and anodic areas of metal.
- DNeither cathodic area nor anodic areas of metal.
✓
Answer
Correct option: A.
Anodic area of metal.
Corrosion can be defined as the deterioration of materials by chemical processes. Of these, the most important by far is electrochemical corrosion of metals in which the oxidation process $\mathrm{M} \rightarrow \mathrm{M}^{+}+\mathrm{e}^{-}$ is facilitated by the presence of a suitable electron acceptor. This is possible because metals are conductive and so, the electrons can flow through the metal from the anodic to the cathodic regions.
Metallic corrosion occurs when metal atoms are oxidized and subsequently leave the metal lattice as ions. The oxidation reaction of the metal is referred to as the anodic half$-$reaction. The areas on a metal surface where oxidation occurs are referred to as anodes.
Metallic corrosion occurs when metal atoms are oxidized and subsequently leave the metal lattice as ions. The oxidation reaction of the metal is referred to as the anodic half$-$reaction. The areas on a metal surface where oxidation occurs are referred to as anodes.
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