Question

Which of the following phenomenon in which the inhibiting effect is sometimes greater than that would be achieved by either of the two or substances alone?

(a) Galvanic effect

(b) Cathodic protection

(c) Synergistic effect

(d) Inhibiting effect

This question was posed to me during a job interview.

Question is from Corrosion Prevention in section Corrosion Prevention of Corrosion Engineering

Answer 1

Right answer is (c) Synergistic effect

The best I can explain: When two or more inhibiting substances are added to a corrosive system, the inhibiting effect is sometimes greater than that achieved by either of the two or more substances alone. This is called a synergistic effect.