Anodic material used for the cathodic protection of underground buried steel pipeline is_________________?
Correct answer: B. Zinc or magnesium
- A. Nickel or copper
- B. Zinc or magnesium
- C. Bronze
- D. Brass
Explanation
Zinc and magnesium are more active than steel and therefore dissolve as sacrificial anodes, supplying cathodic protection to the buried pipeline. Nickel, copper, bronze and brass are too noble for this purpose.
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