The surface of galvanized steel roofing sheet evenly distributes a layer of zinc material which 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 which 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.