Corrosion of less corrosion-resistant metal is usually increased

corrosion-of-less-corrosion-resistant-metal-is-usually-increased

Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.

A. True

B. False

I got this question in an international level competition.

This intriguing question comes from Eight Forms in chapter Eight Forms of Corrosion of Corrosion Engineering

Right answer is A. True

For explanation I would say: As galvanic corrosion is a bi-metallic corrosion, relatively less corrosion-resistant metal preferentially acts as anode and relatively high corrosion-resistant metal preferentially acts as a cathode. This increases attack on the less corrosion-resistant metal (anode) and decreases on high corrosion-resistant metal (cathode).