Question

Which of the following statement is correct regarding pitting corrosion?

(a) Adjacent surfaces cathodically protect pits

(b) Pits cathodically protect adjacent surfaces

(c) Neither pits nor adjacent surfaces protect each other

(d) Both pits and adjacent surfaces protect each other

This question was addressed to me in an interview for job.

My question is based upon Eight Forms in chapter Eight Forms of Corrosion of Corrosion Engineering

Answer 1

The correct answer is (b) Pits cathodically protect adjacent surfaces

To explain: Pits cathodically protect adjacent surfaces of metal; this is also called as cathodic protection. This is due to the autocatalytic nature of pitting corrosion. Hence, pits cathodically protect adjacent surfaces is the correct statement.