Question

What is the reason for the localized attack on the base metal due to the porosity of coatings?

(a) Crevice formation

(b) Galvanic effect

(c) Initiation of pits

(d) Crevice formation and galvanic effect

Answer 1

Right choice is (b) Galvanic effect

For explanation: The localized attack on the base metal due to the porosity of coatings is dueto two-metal corrosion or galvanic effect. Because metal coating and base metal are electrically connected in a corrosive environment.