Answer:a) Mechanical, electrical, and chemical
Mechanical: The coating acts as a physical barrier between the metal and the corrosive environment, preventing water, oxygen, and other corrosive agents from directly contacting the metal.
Electrical: Some coatings are designed to act as sacrificial anodes, attracting corrosive ions and undergoing corrosion themselves instead of the metal they protect.
Chemical: Certain coatings contain corrosion inhibitors that chemically react with corrosive ions in the environment, forming a protective layer on the metal surface and slowing down the corrosion process.
