Why Is The Zinc-aluminum-magnesium Coating Process So Popular in Automotive Applications?

Cars are a very important means of transportation in our lives, driving the rapid development of the automobile industry and the increase in car ownership. When buying a car, many people pay more attention to the vehicle's appearance, power, fuel consumption and other factors, but they often do not understand the car's anti-corrosion capabilities.

For automobiles, corrosion resistance is one of the very important indicators. Traditional pure zinc coating (GI) and zinc-iron alloy coating (GA) have certain limitations in effectively preventing automotive corrosion. Zinc-aluminum-magnesium coatings have been widely used in automobiles due to their advantages in material adhesion, corrosion resistance and wear resistance. Due to the composite effect of Zn, Al, Mg and other elements, the zinc-aluminum-magnesium coating material will form a stable Zn, Mg, ZnAl protective layer (such as green water stone, basic zinc carbonate, aluminum oxide, etc.) on the surface, which can greatly slow down the The corrosion rate of the coating greatly increases the corrosion resistance of the coating several times or even ten times. The alloy elements in the surface coating corrode and dissolve in the water in the atmospheric environment, forming ions and covering the cutting position of the steel plate with the flow of the liquid film, forming a dense protective film to cover the red rust at the cutting position, thereby improving the corrosion resistance of the cut.

Compared with other coating materials, the advantages of Zn-Al-Mg Steel Coil materials for coating are more obvious, mainly reflected in:

1. The zinc-aluminum-magnesium coating has high corrosion resistance, which can greatly slow down the corrosion rate of the coating and improve the corrosion resistance of the coating. Moreover, the corrosion resistance of zinc-aluminum-magnesium coating is more than three times that of pure galvanized products.

2. Zinc-aluminum-magnesium coating has excellent formability, can improve stamping formability and reduce stamping wear.

3. The dezincification amount of zinc-aluminum-magnesium coating materials is low, about 1/3 of hot-dip pure zinc, which solves the dezincification problem and reduces the frequency of mold wiping.

4. The friction coefficient of zinc-aluminum-magnesium coating material is 15% lower than that of hot-dip galvanizing, which makes the plate have good fluidity.

5. Zinc-aluminum-magnesium coating can also reduce raw material costs. Switching to electro-galvanized materials can reduce costs by 300-600 yuan/ton. In the automotive industry, zinc-aluminum-magnesium coating materials have been widely used in the interior and exterior panels of passenger car panels, solving the problems of dezincification and corrosion and avoiding the cost waste and environmental problems caused by the use of electro-galvanizing.

Application cases of zinc aluminum magnesium coating in automobiles:

Since the zinc-aluminum-magnesium coating material has the advantages of high corrosion resistance, good formability, and less stamping wear, it is used in both the inner and outer panels of passenger car coverings to solve the problems of dezincification and corrosion while avoiding the use of electroplating. Wasteful costs and environmental issues caused by zinc.

In summary, zinc-aluminum-magnesium coating materials have many advantages in the automotive industry, including high corrosion resistance, good formability and cost reduction. With the continuous development of technology and the expansion of applications, zinc-aluminum-magnesium coating materials are expected to more widely replace traditional coating materials in the future, further improving the corrosion resistance and service life of automobiles.