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Which of the following is/are the advantages of coal-tar coatings?

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Which of the following is/are the advantages of coal-tar coatings?

(a) Excellent corrosion resistance to fresh and seawater

(b) Excellent corrosion resistant to fresh, seawater and soil immersion

(c) High abrasive resistance

(d) Stable coating

This question was posed to me by my college director while I was bunking the class.

My question is taken from Corrosion Prevention topic in section Corrosion Prevention of Corrosion Engineering

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The correct answer is (b) Excellent corrosion resistant to fresh, seawater and soil immersion

The explanation: Coal-tar coatings are excellent corrosion resistant to fresh, seawater, and soil immersion. Whereas its abrasive resistance and stability of coating are its limitations.

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