Galvanized steel sheet is to prevent corrosion on the surface of the steel sheet and prolong its service life. The surface of the steel sheet is coated with a layer of metal zinc. This kind of galvanized steel sheet is called galvanized sheet. Generally, it is widely used in construction, home appliances, vehicles and ships, container manufacturing, electromechanical industry, etc.
1. Hot-dip galvanized steel sheet
2. Alloyed galvanized steel sheet
3. electro-galvanized steel sheet
4. single-sided and double-sided differential galvanized steel sheet
5. alloy, composite galvanized steel sheet
So what will happen when galvanized mild steel sheet is exposed to the air? In order to better understand the product and want to get some new inspiration in storage, let's learn about it together!
When the galvanized steel sheet is exposed to the air, as long as it will produce dry erosion, wet and cold erosion and wet erosion.
Dry erosion refers to the erosion of the surface layer of the steel plate in ambient air with an air humidity lower than 30% that does not produce a continuous electrolyte water film. At this time, the corrosion rate of the steel plate is relatively slow, but this kind of natural environment standard is less.
Wet-cold erosion refers to the erosion of steel plates in ambient air with an air humidity of more than 30% and less than 100%. In this case, there is dust on the surface of the steel plate, and there are micropores and gaps in the rust layer that cause the microscope to absorb, which produces shrinkage water invisible to the human eye. The principle of galvanic cell is generated under the shrinkage water, and the erosion rate is relatively rapid .
Wet erosion refers to the erosion of galv sheet metal in a humid and cold environment with an air humidity of more than 100%, when there is solidified shrinkage water on the surface that is visible to the human eye. In this case, the shrinkage water on the surface of the steel sheet is thicker, so that the rate of oxygen diffusion to the surface of the steel sheet after melting is relatively slow, and the rate of erosion is reduced. In fact, the corrosion of the steel plate is closely related to the shrinkage of the surface layer between the two. It is also due to the presence of water that the co2 is melted in the water, which causes the iron to produce weak electrolytes and produce a series of weak electrolyte reactions.
The co2 in the gas continues to melt into the water, and the reflection continues. Since the key product reflected is bright red, the substance after iron-air oxidation is generally called "red rust". Red rust is very loose and easily melted. It is unable to maintain the surface of the steel plate from being etched again, which will promote the corrosion of the steel plate until it is completely etched. It is a characteristic of steel. Because of this, the steel must be coated with other metal materials or the thickness of the protective layer of the metal material to avoid the corrosion of the steel.
The above are some of the corrosion characteristics of galvanized steel sheet. If you want to know more, you can continue to pay attention to us.
