1. Electroplating of fasteners

Fastener electroplating refers to immersing the part of the fastener that needs to be electroplated into a specific aqueous solution. The aqueous solution will contain some deposited metal compounds, so that after the current passes through the aqueous solution, the metal substances in the solution will precipitate and adhere to On the immersed part of the fastener. The electroplating of fasteners generally includes zinc, copper, nickel, chromium, copper-nickel alloys, etc.

2. Hot dip galvanizing of fasteners

The hot-dip galvanizing of fasteners is to immerse fasteners of carbon steel components into a plating tank of molten zinc with a heat of about 510℃, so that the iron-zinc alloy on the surface of the fasteners will be converted into passivated zinc, thereby Obtain the surface treatment effect. The price of hot-dip galvanizing of fasteners is higher than that of electroplating, about 1.5 to 2 yuan per kilogram.

3. Mechanical plating of fasteners

The mechanical plating of fasteners refers to the use of specific physical and chemical means to impact the surface of the fastener with the powder of the coated metal, so that the coated metal forms a coating on the surface of the fastener through cold welding to reach the surface Treatment effect. The mechanical plating of fasteners is mainly applicable to spare parts such as screws, nuts and washers.

The main purpose of the surface treatment of fasteners is to obtain the anti-corrosion ability of the fastener itself, so as to increase the reliability and adaptability of the fasteners. Therefore, the quality judgment of the surface treatment of the fasteners is mainly to check Whether the corrosion resistance of fasteners has been effectively increased, and whether the increase is in line with the expected requirements.