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Which of the following corrosion contaminant will act as a protective layer?

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Which of the following corrosion contaminant will act as a protective layer?

(a) AgCl

(b) SnCl2

(c) Fe2O3

(d) CaO

I had been asked this question in my homework.

The origin of the question is Corrosion and its Classification topic in chapter Corrosion Principles of Corrosion Engineering

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Right choice is (a) AgCl

Easy explanation: Silver on reaction with chlorine forms silver chloride. It acts as a protective layer and prevents chlorine to corrode further. Here SnCl2 and CaO are volatile in nature whereas Fe2O3 is porous in nature. Hence, they can’t act as protective layers.

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