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Which of the following metals will switch positions in acetic acid as the temperature gets increased?

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Which of the following metals will switch positions in acetic acid as the temperature gets increased?

(a) Copper and stainless steel

(b) Stainless steel and nickel

(c) Steel and copper

(d) Aluminum and nickel

This question was addressed to me during an interview for a job.

Question is from Environments in section Other Environments of Corrosion Engineering

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Correct option is (a) Copper and stainless steel

Explanation: Acetic acid exhibits unusual corrosion behavior with an increase in temperature. Copper and stainless-steel switch positions as the temperature are increased. Copper shows little corrosion at high temperatures whereas stainless steels corrode rapidly and vice versa.

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