Question

Which of the following standard expression is used to measure the corrosion rate of a metal?

(a) Mils per year = W/DAT

(b) Mils per year = 534W/DAT

(c) Milligrams decimeter per day = 534W/DAT

(d) Milligrams decimeter per day = W/DAT

This question was addressed to me in an international level competition.

The question is from Testing topic in chapter Corrosion Testing of Corrosion Engineering

Answer 1

The correct choice is (b) Mils per year = 534W/DAT

To explain: Standard expression to measure the corrosion rate in mils per year = 534W/DAT.

Where D is the density of metal, W is weight loss in milligrams, A is the area of exposure in sq. inches, T is time in hours.