The surface of galvanized steel roofing sheet evenly distributes a galvanized layer. It enjoys good corrosion resistance and can lengthen the service life of galvanized steel roofing sheet. So, how can the galvanized layer prevent being rusted?
Steel can easily rust in air and water. Yet, the corrosion rate of zinc in atmosphere is 1/15 of that of steel. Galvanized steel roofing sheet uses compact galvanized layer to prevent it from being corroded.
It is difficult for zinc to change in dry air. Yet in wet air, a layer of thick basic zinc carbonate film can generate in the surface. Then this can prevent corrosion of zinc. The galvanized layer and steel plate constitute iron-zinc microbattery. Even though part of zinc layer is damaged, steel substrate can become negative pole so as to protect itself when a small part of steel substrate is exposed.
Although galvanized steel roofing sheet enjoys good corrosion resistance, CAMELSTEEL still remind you to make protective measures on galvanized steel roofing sheet, thus it can better serve users.
Galvanization is the process of applying a protective coating to steel or iron. The coating is made from zinc and is used to halt the formation of rust. Galvanization is important because it provides long-lasting protection for steel and iron products.
The galvanized layer prevents corrosive substances like acid (acid rain for example) from reaching the metal underneath.
Galvanized layer protects from rusting. When the coating is scratched, zinc will still “sacrifice its anode” easier than the base metal does – which protects it from rusting.