OEM L-Shaped Punching Gasket in Metal Stamping

Continuous hot-dip galvanized steel sheet, abbreviated as galvanized sheet or white iron sheet, is a cold-rolled continuous hot-dip galvanized steel sheet and strip with a thickness of 0.25~2.5mm. The strip is first heated by a flame in a preheating furnace to burn off residual oil on the surface, and at the same time,CNC Machining an iron oxide film is generated on the surface. It is then heated to 710~920 ℃ in a reduction annealing furnace containing a mixture of H2 and N2 gas to reduce the iron oxide film to sponge iron. The surface activated and purified strip steel is cooled to a temperature slightly higher than that of molten zinc, Enter a zinc pot at 450~460 ℃ and use an air knife to control the surface thickness of the zinc layer. Finally, Sheet Metal Part it is passivated by chromate solution to improve white rust resistance. Compared to the surface of Galvanized Sheet Metal, Sheet Metal Roller its coating is thicker and mainly used for Sheet Metal Parts that require strong corrosion resistance.

The aluminum zinc alloy coating of aluminum zinc coated sheet is composed of 55% aluminum, 43.4% zinc, and 1.6% silicon solidified at a high temperature of 600 ℃, forming a dense quaternary crystalline protective layer with excellent corrosion resistance. The normal service life can reach 25 years, which is 3-6 times longer than galvanized sheet and equivalent to stainless steel. The corrosion resistance of aluminum zinc coated panels comes from the barrier layer protection function of aluminum and the sacrificial protection function of zinc. When zinc is used as sacrificial protection in the cut edges, scratches, and coating scratches, aluminum forms an insoluble oxide layer, playing a barrier protection function.