Question

Which of the following metals will act as sacrificial metals in cathodic production?

(a) Tin and zinc

(b) Zinc only

(c) Magnesium, zinc and magnesium

(d) Magnesium and tin

This question was addressed to me in unit test.

I'm obligated to ask this question of Materials in section Materials of Corrosion Engineering

Answer 1

Correct option is (c) Magnesium, zinc and magnesium

Explanation: Sacrificial metals are the metals that corrode preferentially over the metallic structure that needs to be protected. This cathodic protection works on the principle of the galvanic effect. Tin, zinc, magnesium are the common sacrificial metals used.