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Which method uses the powdered form of a coating to form the protective layer?

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Which method uses the powdered form of a coating to form the protective layer?

(a) Electroplating

(b) Hot dipping

(c) Vapor plating

(d) Cementation

The question was posed to me in final exam.

The above asked question is from Protective Coatings topic in portion Composite & Ceramic Materials of Engineering Material & Metallurgy

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The correct choice is (d) Cementation

The explanation is: Cementation is the process of alloying powdered coating metal with the base metal below melting point temperatures. Carburizing and sherardising are types of cementation processes. Al, Zn, Cr, and W are only a few metals used for cementation.

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