Discussion
A metal with a small grain size generally corrodes
Answer: B
Correct answer: faster, having more grain boundary area
Grain boundaries are regions of disordered, higher-energy atoms, so they dissolve preferentially. Reducing the grain size multiplies the boundary area per unit volume and gives the attack more sites to work on. It is a genuine trade-off in design, since fine grains are wanted for strength and toughness and work against corrosion resistance.
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