Discussion
Galvanic corrosion occurs when two dissimilar metals in contact are exposed to an electrolyte, and the metal attacked is the
Answer: D
Correct answer: more anodic of the two
The anodic metal is the one that gives up electrons, so it dissolves while the cathodic metal is protected. Which is which is read off the galvanic series in the electrolyte concerned. The area ratio matters greatly but does not decide the direction: a small anode joined to a large cathode simply concentrates the same current into less metal, and corrodes very much faster.
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