Question

Which of the following corrosion test is most reliable to know the extent of pitting corrosion?

(a) To measure the average depth of pits

(b) To measure the maximum depth of a pit

(c) Weight loss method

(d) Weight gain method

I had been asked this question in quiz.

I'm obligated to ask this question of Eight Forms in division Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Right option is (b) To measure the maximum depth of a pit

The best I can explain: The measurement of maximum depth of pit would be a more reliable way of expressing pitting corrosion. As metal loss or metal gain (corrosion product) is very small and does not indicate the depth of penetration.