When the coating of galvanized coils and tin-plated coils is damaged, galvanized coils are more corrosion-resistant because zinc is more reactive than iron during electrochemical corrosion, making it suitable as the negative electrode in a galvanic cell. Zinc loses electrons and is oxidized, thus protecting the iron. Tin, on the other hand, is less reactive than iron. When the coating of tin-plated coils is damaged, the iron acts as the negative electrode, losing electrons and being oxidized.

Time：18/05/2026 17:33:25

The answer to whether tinned steel coil or galvanized steel coil is more corrosion-resistant is not absolute. It depends on whether the coating is intact or damaged.

With intact coating: Galvanized steel coil is very corrosion-resistant; tinned steel coil is extremely corrosion-resistant and has a bright, stable finish, making it practically food-grade safe.

With damaged coating: In galvanized steel coil, the reactive zinc will corrode preferentially, protecting the steel and making it more corrosion-resistant; in tinned steel coil, the steel at the damaged area will corrode faster than before plating, posing a very high risk of corrosion.

Time：14/05/2026 17:43:13

Answers

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