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Why straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications?

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Why straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications?

(a) Due to susceptibility to crevice

(b) Due to limited corrosion resistance

(c) Due to susceptibility to pitting

(d) Sensitive to erosion-corrosion

The question was posed to me in a job interview.

Question is taken from Mineral Acids in division Mineral Acids of Corrosion Engineering

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The correct choice is (c) Due to susceptibility to pitting

Explanation: Straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications due to their susceptibility to pitting corrosion. Whereas (410) of stainless steel is sensitive to erosion-corrosion.

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