Electroplating, hot dip galvanizing, and mechanical plating of fastener surfaces are the most common method of forming a cover layer on the surface of fasteners. After surface treatment, the fasteners can be more aesthetically pleasing. Appearance, the corrosion resistance of the fastener itself will also be improved. The main purpose is to make the fastener itself corrosion-resistant to increase the reliability and adaptability of the fastener. Therefore, the quality judgment of the surface treatment of the fastener is mainly to check the corrosion resistance of the fastener. Whether it is effective to increase, and whether the increase is in line with the expected requirements. 1. Electroplating of fasteners Electroplating of fasteners means immersing the parts of the fasteners that need to be electroplated into a specific aqueous solution. The aqueous solution will contain some deposited metal compounds, so that after passing through the aqueous solution by electric current, the metal substances in the solution are deposited and adhered to The immersed portion of the fastener. The plating of fasteners generally includes galvanizing, copper, nickel, chromium, copper-nickel alloy, and the like. 2. Hot dip galvanizing of fasteners The hot dip galvanizing of the fastener is to immerse the carbon steel component fastener into the plating bath of the molten zinc having a heat of about 510 ° C, so that the iron-zinc alloy on the surface of the fastener is converted into passivated zinc, thereby Get a surface treatment effect. The price of hot-dip galvanizing of fasteners is higher than that of electroplating, which is about 1.5 to 2 yuan per kilogram. 3. Mechanical plating of fasteners Mechanical plating of fasteners means that the surface of the fastener is impacted by a specific physical and chemical means with a powder of coated metal, so that the coated metal forms a coating on the surface of the fastener by cold welding to reach the surface. Processing effect. Mechanical plating of fasteners is mainly suitable for spare parts such as screws, nuts and gaskets. Canada Temporary Fence,Temporary Fencing,Removable Fence Shunxing Hardware Wire Mesh Co., Ltd. , http://www.rywiremesh.com