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Which of the following is considered as high corrosive resistant material?

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Which of the following is considered as high corrosive resistant material?

(a) Mild steel

(b) Cast iron

(c) Zinc

(d) Stainless steel

The question was asked in an international level competition.

This question is from Corrosion and its Classification in portion Corrosion Principles of Corrosion Engineering

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Right option is (d) Stainless steel

Explanation: Corrosion resistant material is the material which has less corrosion rate in a particular atmosphere without much degradation. Stainless steel (an alloy of iron, chromium, nickel) is considered as corrosion resistant material. This is because it forms chromic oxide layer over its surface to avoid physical contact with the outside environment.

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