Why does galvanized sheet rust?
The zinc is corroded normally, otherwise it means that the zinc plate is impure and contains impurities, such as iron. Zinc protects other metals. Uneven zinc coating will expose the metal inside and cause corrosion. Or inadvertently contact with other metals to form chemical corrosion.
Galvanized sheet can also rust, but the galvanized layer is oxidized first to protect the steel pipe from rust, and its service life is longer. Under natural conditions, the chrome-plated layer will not react with oxygen, carbon dioxide and water in the air, and will not be corroded by weak acids and alkalis. Its antirust effect is certainly better.
Galvanized sheet will not rust in normal environment, and it may be cast due to improper storage, scraping and collision, water invasion and steam fumigation. The reason why the galvanized sheet rusts is that the zinc is corroded normally to protect other metals. Otherwise, the zinc plate is impure and contains impurities, such as iron. Or the zinc coating is uneven, exposing the metal inside, causing corrosion, or inadvertently contacting with other metals, forming chemical corrosion.
Post time: Feb-11-2023