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Which of the following types of corrosion in which stainless steels are more susceptible than ordinary steels?

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Which of the following types of corrosion in which stainless steels are more susceptible than ordinary steels?

(a) Pitting corrosion

(b) Stress-corrosion cracking

(c) Intergranular corrosion

(d) Stress-corrosion cracking, pitting and intergranular corrosion

I had been asked this question during an internship interview.

The doubt is from Prevention topic in section Corrosion Prevention of Corrosion Engineering

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The correct answer is (d) Stress-corrosion cracking, pitting and intergranular corrosion

The best explanation: Stainless steels are more susceptible to localized corrosion such as intergranular corrosion, stress-cracking corrosion, and pitting corrosion than ordinary steels. Instability of oxide layer in severe corrosive conditions and sensitizing temperature are the reasons for the susceptibility of stainless steel.

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