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Which of the following applications does a tungsten-carbide coating provide?

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Which of the following applications does a tungsten-carbide coating provide?

(a) Abrasion resistance

(b) Corrosion resistance

(c) Loss of coating mass

(d) Heat resistance

The question was posed to me in a job interview.

This intriguing question comes from Refractory Materials, Superalloys topic in chapter Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Correct choice is (c) Loss of coating mass

Easiest explanation: Cobalt-cermet based coatings are generally used due to their effects on temperature and oxidation. Tungsten carbide is one such cobalt-cermet based coating which is resistant to abrasion, corrosion, and heat.  Additionally, these coatings have the benefit of nominal loss of coating mass due to the presence of carbides.

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