Technician A says the magnesium coating on the galvanized steel corrodes to protect the steel surface. Technician A says that aluminum does not corrode, and therefore will last much longer than steel. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is incorrect because it is the zinc in galvanized steel, not magnesium, that corrodes to protect the steel surface. Technician B is incorrect because aluminum does corrode, but it forms a protective layer of aluminum oxide that prevents further corrosion, which is different from not corroding at all.

Technician a Says the Magnesium Coating on the Galvanized Steel