Question

Which of the following ions have a high tendency to pitting corrosion?

(a) Chlorides

(b) Bromides

(c) Hypo chlorites

(d) Chlorides, bromides, and hypochlorites

This question was posed to me during a job interview.

My doubt stems from Eight Forms topic in section Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Right answer is (d) Chlorides, bromides, and hypochlorites

To explain: In practical applications, most pitting failures are caused by chloride ions, hypochlorites, and bromide ions. Oxidizing metal ions with chlorides are aggressive pitters. Cupric, ferric, and mercuric halides are extremely aggressive.