A steel pipe can be protected from corrosion by attaching the pipe to a piece of magnesium because

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Quizplus · Accepted Answer

Magnesium is more easily oxidized than iron, which means that it will corrode before the steel pipe does. This sacrificial protection mechanism, also known as cathodic protection, involves attaching a more easily corroded metal to the steel pipe, which absorbs the corrosive action and prolongs the life of the pipe. Magnesium is a good choice for cathodic protection because it is highly electrochemically active and forms a protective oxide coating that prevents further corrosion.

A Steel Pipe Can Be Protected from Corrosion by Attaching