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Which of the following common alkalies that results in stress-corrosion cracking of steel?

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Which of the following common alkalies that results in stress-corrosion cracking of steel?

(a) Caustic soda

(b) Caustic soda and caustic potash

(c) Caustic potash

(d) Sodium carbonate

This question was posed to me in an internship interview.

This intriguing question comes from Environments in chapter Other Environments of Corrosion Engineering

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Right option is (b) Caustic soda and caustic potash

The explanation: Caustic soda and caustic potash are the common alkalies that result in stress-corrosion cracking of steel. It usually occurs in high concentrations only.

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