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Which of the following corrosives that induce intergranular corrosion in austenitic stainless steel?

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Which of the following corrosives that induce intergranular corrosion in austenitic stainless steel?

(a) Acetic acid

(b) Acetic acid+salicylic acid

(c) Ammonium nitrate

(d) Acetic acid, acetic acid+salicylic acid, ammonium nitrate

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My doubt is from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

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Right answer is (d) Acetic acid, acetic acid+salicylic acid, ammonium nitrate

The explanation: Stainless steel is highly susceptible to intergranular corrosion. These corrosives such as acetic acid, acetic acid+salicylic acid, ammonium nitrate, etc. Induces the intergranular corrosion in austenitic stainless steel.

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