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Square metal plates having a total exposed area of 10.75 ft.2 are fastened together with rivets having a total exposed area of 15.5 in.2. The environment involves moisture and some salt. Consider two cases: (1) iron plates with nickel-copper alloy rivets, and (2) nickel-copper alloy plates with iron rivets.

(a) For each case, which metal will corrode?

(b) How do the rates of corrosion compare for the two cases?

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