Question

Which of the following is/are the ideal characteristics of the passive metal oxide layer?

(a) Good adherence and high melting point

(b) Low electrical conductivity and low vapor pressure

(c) Good adherence, high melting point, low vapor pressure, and low electrical conductivity

(d) Good adherence and high vapor pressure

I got this question by my school principal while I was bunking the class.

This question is from High-Temperature Corrosion in portion High Temperature Corrosion of Corrosion Engineering

Answer 1

The correct option is (c) Good adherence, high melting point, low vapor pressure, and low electrical conductivity

To explain: Ideal characteristics of passive metal oxides layer are:

Good adherence

High melting point

Low electrical conductivity

Low vapor pressure

Low diffusion coefficient.