Discussion
A scratch through a galvanised coating does not lead to rusting of the steel because zinc is
Answer: B
Correct answer: anodic to steel and protects it sacrificially
Zinc is anodic to iron, so at a scratch it is the zinc that dissolves and the exposed steel that becomes the cathode. The protection is therefore active rather than merely a barrier, and it continues as long as any zinc remains nearby - which is why a galvanised sheet can be cut and drilled on site without special treatment of the edges.
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