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Which of the following inhibitor is used for steel in the water?

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Which of the following inhibitor is used for steel in the water?

(a) Sodium silicate

(b) Alkali metal nitrates

(c) Benzoic acid

(d) 2% boron trifluoride

This question was addressed to me in an interview for job.

This question is from Corrosion Prevention topic in chapter Corrosion Prevention of Corrosion Engineering

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Correct option is (c) Benzoic acid

The best I can explain: Inhibitors are the chemical compounds that decrease the corrosion rate of metal in a specific environment. Benzoic acid is used as an inhibitor for steel in water.

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