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Which of the following coatings has a glass composition?

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Which of the following coatings has a glass composition?

(a) Paint

(b) Galvanized

(c) Enamel

(d) Anodized

I got this question by my college professor while I was bunking the class.

I want to ask this question from Protective Coatings in section Composite & Ceramic Materials of Engineering Material & Metallurgy

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The correct answer is (c) Enamel

To elaborate: Enamel (vitreous) is a protective coating composed of glass containing a metal substrate.  Paint is composed of organic material, whereas galvanized coating has anodic metal, both of which contain metal substrate. The anodized coating has an Al composition with an aluminum substrate.

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