Galvanized Coils

1、 The whole etching process of galvanized coil

In the whole application cycle time of galvanized coil, the first corrosion is the air oxidation of the surface hot-dip galvanized layer, which turns into "white rust". After a little longer time, the "white rust" on the surface further reacts with the residual vapor such as carbon dioxide in the wet and cold gas, and transforms into "macula". When the galvanized sheet has been used for a long time and the hot-dip galvanizing layer is corroded seriously, the steel base loses the effect of "sacrificing oneself for duty and anti-corrosion" of zinc, and it just begins to oxidize in the air and turns into "red rust". As soon as the steel base begins to air oxidize, the corrosion rate will be faster and faster, and the service life of galvanized steel sheet will come to an end.

2、 Key factors of corrosion of galvanized coil

1. Air humidity

2. Temperature

3、co2

4. Environmental pollution elements

When there is environmental pollution in the gas or the metal surface is not clean, the metal material will also rapidly erode under low air humidity. When the ambient humidity is at the critical value, the air humidity increases again, and the corrosion rate of galvanized coil is further slowly expanded.