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Which of the following alloys is/are prone to intergranular corrosion?

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Which of the following alloys is/are prone to intergranular corrosion?

(a) Iron in aluminum

(b) Zinc in brass

(c) 18-8 Stainless steel

(d) Iron in aluminum, zinc in brass and 18-8 stainless steel

This question was addressed to me at a job interview.

Enquiry is from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

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Right option is (d) Iron in aluminum, zinc in brass and 18-8 stainless steel

Best explanation: All the given alloys are prone to intergranular corrosion. Iron in aluminum and zinc in brass are susceptible to this corrosion, due to the segregation of iron and zinc respectively at the grain boundaries. Whereas 18-8 Stainless steel is susceptible due to the depletion of chromium at the grain boundaries.

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