Why does zinc, aluminum and magnesium give steel plates the ability to "self-heal"?

What are the characteristics of galvanized aluminum and magnesium steel plates

1.High corrosion resistance

Like high-strength steel, the good corrosion resistance of zinc-aluminum-magnesium plates is determined by its structure. Magnesium can not only improve the corrosion resistance, but also improve the wettability of the strip in the plating solution, reduce the surface tension of the zinc solution, and reduce the occurrence of missing plating defects; adding aluminum on the basis of galvanizing can significantly improve the resistance of the steel plate. Corrosion performance and heat resistance. In addition, according to the results of published laboratory acceleration experiments and outdoor exposure experiments, it is shown that increasing the content of AI and Mg within a certain range will increase the corrosion resistance of steel plates by several or more than ten times.

2.Self-healing + edge protection performance

Coated steel plates often face secondary processing such as cutting and drilling in construction applications, and the corrosion of steel plates often starts from this. The zinc-aluminum-magnesium coating combines the cathodic protection of "zinc" and the active performance of "magnesium" to speed up the coating's coverage of the incision. The "aluminum" contacts oxygen to form a stable alumina protective layer, protecting the substrate from being Erosion, the perfect combination of the three improves the self-healing effect of the steel plate.

3.Good welding processing performance

The incisions and punched holes of galvanized aluminum-magnesium plates have excellent self-healing function and do not require subsequent processing. This special performance overcomes the inherent defects of traditional coated plates and has high overall cost performance. It can replace ordinary galvanized plates, color steel, Stainless steel and aluminum plates and other building materials.

4.Good scratch and corrosion resistance

Plane corrosion of coated steel plates mostly occurs at scratches, and scratches are a phenomenon that is difficult to avoid on coated steel plates, especially during processing. If the coated steel plate itself has good scratch resistance, it can be used in a very long time. Avoid scratches to a large extent, thus extending its service life. The magnesium dissolved from the coating of the zinc-aluminum-magnesium plate can form a fine, dense oxide film containing magnesium on the cut section, covering the exposed steel base in the scratched or cut area, thereby improving its scratch and corrosion resistance.

As a new type of coated steel plate, zinc-aluminum-magnesium plate can be directly processed and used, which shortens the processing period of component products and has good controllability of the project construction period. In addition, due to its corrosion resistance, wear resistance, coating resistance and good welding processability, it has been widely used in various industries, whether in the construction (photovoltaic) industry, automobile manufacturing industry, animal husbandry or airport , high-speed rail construction, etc., we can all see the presence of zinc-aluminum-magnesium panels.