Question

Which of the following metals is/are subjected to increased attack in the presence of oxygen?

(a) Aluminum and its alloys

(b) Copper and its alloys

(c) Cast iron and steel

(d) Copper and its alloys, cast iron and steels

The question was posed to me in an interview.

The origin of the question is Testing topic in division Corrosion Testing of Corrosion Engineering

Answer 1

Right choice is (d) Copper and its alloys, cast iron and steels

To elaborate: Dissolved oxygen will be reduced cathodically into hydroxide ions in many of the corrosion systems and it increases the dissolution of metal anodically. Metals such as copper and its alloys, cast iron and steels are subjected to increase attack in the presence of oxygen.