Question

Which of the following is the driving force in galvanic corrosion?

(a) Conductivity of electrolyte

(b) Crystal structure of metals

(c) The potential difference between the two metals

(d) Temperature of electrolyte

I got this question during an interview for a job.

This intriguing question originated from Eight Forms topic in chapter Eight Forms of Corrosion of Corrosion Engineering

Answer 1

The correct option is (c) The potential difference between the two metals

To explain I would say: The principle driving force for current transfer and corrosion is the potential developed between the two metals. This potential difference can be altered by various factors such as conductivity of electrolyte and temperature of the electrolyte.