Surface treatment method of fasteners

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 attached to the immersed part of the fastener. Electroplating of fasteners generally includes zinc, copper, nickel, chromium, copper-nickel alloys, etc.

　　2, hot dip galvanizing of fasteners

　　 Fastener hot-dip galvanizing is to immerse fasteners made of carbon steel into a bath of molten zinc with a heat of about 510℃, so that the iron-zinc alloy on the surface of the fasteners will be transformed into passivation Zinc to obtain a 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. (Guide: Standard Specification for Screws for Fasteners)

　　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 by cold welding , To achieve the surface treatment effect. The mechanical plating of fasteners is mainly applicable to spare parts such as screws, nuts and washers.

　　 The surface treatment of fasteners is more important to make the fasteners have anti-corrosion ability, so as to increase the reliability and adaptability of fasteners. Therefore, the quality of the surface treatment It is mainly to check whether the anti-corrosion ability of fasteners has been effectively increased, and whether the increase range meets the expected requirements.

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