Question

What is meant by diffusion coatings?

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

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

(c) Heat treatment to cause alloy formation by diffusion of one metal into the other

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

The question was posed to me in my homework.

I need to ask this question from Corrosion Prevention in chapter Corrosion Prevention of Corrosion Engineering

Answer 1

Correct option is (c) Heat treatment to cause alloy formation by diffusion of one metal into the other

To elaborate: Diffusion coatings involve heat treatment to cause alloy formation by diffusion of one metal into the other. It is also called as surface alloying. It improves various properties such as wear-resistance and corrosion resistance at the surface.