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Which of the following metal is not corrosion resistant to sulfuric acid?

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Which of the following metal is not corrosion resistant to sulfuric acid?

(a) Grey cast iron

(b) Duriron

(c) Durimet 20

(d) Lead

I have been asked this question during an internship interview.

My question is from Mineral Acids in section Mineral Acids of Corrosion Engineering

1 Answer

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Best answer
Correct choice is (a) Grey cast iron

Best explanation: Grey cast iron is not corrosion resistant to sulfuric acid as it penetrates the metal along with the graphite flakes. Though the corrosion rates are small but the metal may split open in service.

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