Question

Which of the following is/are correct regarding the measurement of the rate of oxidation?

(a) Weight loss per unit area of metal is the measure of the rate of oxidation

(b) Either weight loss or weight gain per unit area of metal is the measure of the rate of oxidation

(c) Weight gain per unit area of metal is the measure of the rate of oxidation

(d) Neither weight loss nor weight gain per unit area of metals is the measure of the rate of oxidation

This question was posed to me in an online interview.

This key question is from High-Temperature Corrosion in division High Temperature Corrosion of Corrosion Engineering

Answer 1

Correct choice is (c) Weight gain per unit area of metal is the measure of the rate of oxidation

To elaborate: Rate of oxidation is usually measured and expressed in terms of weight gain per unit area of metal. As oxidation results in the conversion from metal M (x gms) to metallic oxides MOn (x+n*16 gms).