November 7, 2022
When the galvanized steel plate is exposed to the air, the key is to produce dry manic, wet cold and wet erosion and so on.
Dry manic corrosion of galvanized steel refers to the corrosion of steel in the ambient air where the air humidity is less than 30% and the surface layer does not produce continuous electrolyte water film. Under such circumstances, the rate of corrosion of steel
It's relatively slow. But there are few such natural environment standards.
Wet - cold corrosion of galvanized steel refers to the corrosion of steel in ambient air where the air humidity is more than 30% and less than 100%. In this case, there is dust on the surface of the steel, and there is micro in the rust layer
Holes and gaps caused by the microscope absorption, the human eye can not see the contraction of water, in the contraction of the underwater cell principle, the erosion rate is relatively rapid.
Wet corrosion of galvanized steel plate refers to the corrosion of galvanized steel plate when there is solidified and shrinking water visible to human eyes on the surface in the moist and cold air environment where the air humidity is more than 100%. In things like this
Below, the steel surface shrinkage water is thicker, which makes the oxygen diffusion rate to the outside of the steel surface after melting slower, reducing the rate of erosion. In fact, the corrosion of steel is closely related to the shrinkage of the surface water between the two, but also due to
When water is added, co2 is dissolved in the water, which makes the iron produce a weak electrolyte and produces a series of weak electrolyte reactions.
As the co2 in the gas continues to melt into the water, the reaction continues. Because the key product reflected is bright red, so the oxidized material of iron air is generally called "red rust". Red rust is very rusty
Loose, very easy to melt, can not maintain the steel surface not to be eroded again, promote the corrosion of steel has been carried out until it is completely eroded, it is the characteristics of steel. Because of this, the steel must be coated by the surface
Other metal material or metal material protective thickness to reasonably avoid corrosion of steel.
