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Which of the following impurity that causes rapid intergranular stress corrosion cracking of sensitized austenitic stainless steels in refinery operations?(a) Sodium chloride(b) Naphthenic acid(c) Hydrogen sulfide(d) Carbon dioxideThis question was posed to me by my school principal while I was bunking the class.Query is from Environments in chapter Other Environments of Corrosion Engineering

Answer»

The correct choice is (b) Naphthenic acid

To elaborate: Naphthenic acid CAUSES rapid INTERGRANULAR stress CORROSION CRACKING of sensitized austenitic stainless steels in refinery operation. WHEREAS naphthenic acid is a combination of cyclopentyl and cyclohexyl carboxylic acids.



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