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Which of the following is an example of cathodic protection?

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Which of the following is an example of cathodic protection?

(a) Electroplating of steel

(b) Galvanization of steel

(c) Magnesium connected to steel pipes

(d) Electroplating of steel, galvanization of steel and magnesium connected to steel

I have been asked this question during an online exam.

This interesting question is from Eight Forms topic in portion Eight Forms of Corrosion of Corrosion Engineering

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Correct option is (d) Electroplating of steel, galvanization of steel and magnesium connected to steel

The best I can explain: Electroplating and galvanization are cathodic protections of steel based on the galvanic effect. If steel under zinc or other metal coating exposed to corrosive atmosphere, zinc corrodes preferentially than steel. Magnesium acts as a sacrificial anode when it is connected to underground steel pipes.

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