With the continuous improvement of technology, alloy elements such as aluminum zinc alloy and zinc aluminum magnesium alloy with better corrosion resistance have been added to the surface of steel plates, not only improving the service life of steel plates and extending the service life of buildings, but also solving insurmountable problems for many building materials.
01
What is zinc aluminum magnesium plate?
Zinc aluminum magnesium alloy coated steel plate is a new type of coated product. According to the definition of European standard EN10346-2015, it refers to a ternary alloy coating with a certain amount of aluminum and magnesium added to the existing hot-dip galvanized coating, where the content of aluminum and magnesium ranges from 1.5 to 8% (with a magnesium content not less than 0.2%).
When the content of Zn, Al, and Mg ternary eutectic phases in the entire coating structure reaches a certain level, the corrosion products are insoluble colloidal substances with low conductivity, which can effectively isolate the transmission of coating and external substances, forming a dense and effective protective layer on the surface of the steel plate to prevent corrosion. The cathodic reaction will be effectively suppressed with the appearance of this double-layer structure, significantly improving the corrosion resistance of the coating.
02
What are the characteristics of zinc aluminum magnesium plates?
corrosion resistance
Like high-strength steel, the excellent corrosion resistance of zinc aluminum magnesium plates is determined by their microstructure. Magnesium can not only improve corrosion resistance, but also enhance the wettability of the strip steel in the plating solution, reduce the surface tension of the zinc solution, and reduce the occurrence of plating defects; Adding aluminum on the basis of galvanizing can significantly improve the corrosion resistance and heat resistance of steel plates. In addition, according to publicly available laboratory accelerated experiments, outdoor exposure experiments, and other results, an increase in AI and Mg content within a certain range can improve the corrosion resistance of steel plates by several or more times.
Self healing+trimming protection performance
Coated steel plates often face secondary processing situations such as cutting and punching in construction applications, which often leads to corrosion of the steel plates. The zinc aluminum magnesium coating combines the cathodic protection of "zinc" and the active performance of "magnesium", accelerating the coverage of the coating on the incision area. The contact between "aluminum" and oxygen forms a stable aluminum oxide protective layer, protecting the substrate from erosion. The perfect combination of the three improves the self-healing effect of the steel plate.
Good welding processing performance
Galvanized aluminum magnesium sheet has excellent self-healing function in cutting and punching positions, without the need for subsequent treatment. This special performance overcomes the inherent defects of traditional coated sheet, and has a high comprehensive cost-effectiveness. It can replace ordinary galvanized sheet, color steel, stainless steel, aluminum sheet and other building materials.
Good scratch and corrosion resistance
Surface corrosion of coated steel plates mostly occurs at scratches, which are a phenomenon that is difficult to avoid for coated steel plates. Especially during the processing, if the coated steel plate itself has good scratch resistance, it can largely avoid scratches and improve its service life. The magnesium dissolved from the zinc aluminum magnesium plate from the coating can generate a fine, dense oxide film containing magnesium on the cut section, covering the steel substrate exposed at the scratch or cut area, thereby improving its scratch corrosion resistance.
As a new type of coated steel plate, zinc aluminum magnesium plate can be directly processed and used to shorten the processing period of component products, and the project schedule is controllable. In addition, with its corrosion resistance, wear resistance, coating resistance, and good welding performance
