Question

What is meant flame spraying metallic coating?

(a) Hot rolling of two metals together to get a composite sheet

(b) A wire or powder through melting flame is blown onto the surface to be protected

(c) Coating metal is vaporized electrically to deposit on the metals to be coated

(d) Immersing native metal in a solution of the metal to be plated

The question was asked at a job interview.

Origin of the question is Corrosion Prevention topic in division Corrosion Prevention of Corrosion Engineering

Answer 1

Correct answer is (b) A wire or powder through melting flame is blown onto the surface to be protected

The best I can explain: Flame spraying metallic coating is a method of metal coating in which a wire or powder through the melting flame is blown onto the surface to be protected. Oxygen, acetylene, and propane are used for melting flame.