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Which of the following metal results in stress corrosion cracking in an ammoniacal solution?

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Which of the following metal results in stress corrosion cracking in an ammoniacal solution?

(a) Aluminum and its alloys

(b) Nickel and its alloys

(c) Copper and its alloys

(d) Stainless steels

This question was addressed to me in a job interview.

The doubt is from Environments in division Other Environments of Corrosion Engineering

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Correct answer is (c) Copper and its alloys

For explanation: Copper and its alloys result in stress corrosion cracking in ammoniacal solutions. The decomposition of organic materials containing nitrogen has caused stress corrosion cracking.

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