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Which of the following metal shows a decrease in corrosion attack with an increase in velocity in fuming nitric acid?

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Which of the following metal shows a decrease in corrosion attack with an increase in velocity in fuming nitric acid?

(a) Aluminum

(b) Carbon steel

(c) Stainless steel 347

(d) Copper

This question was addressed to me in my homework.

I want to ask this question from Eight Forms in section Eight Forms of Corrosion of Corrosion Engineering

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Correct choice is (c) Stainless steel 347

To explain I would say: Under stagnant conditions, stainless steel 347 in nitric acid is attacked autocatalytically because of the formation of nitrous acid as a cathodic reaction product. An increase in velocity sweeps away the corrosive nitrous acid in the environment.

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