Three methods for surface treatment of fasteners

Surface treatment of the fastener means, the process of forming a covering layer on the surface fastener by some method, the surface fastener after treatment, can exhibit a more attractive appearance, the fastener itself against corrosion Ability will also increase. There are several methods for surface treatment of fasteners.

1, plating of fasteners

The electroplating of fasteners refers to immersing the portions of the fasteners that need to be electroplated in a particular aqueous solution. The aqueous solution will contain some deposited metal compounds. After the current passes through the aqueous solution, the metallic substances in the solution will precipitate and adhere to The immersed part of the fastener. The electroplating of fasteners generally includes galvanizing , copper, nickel, chromium, copper-nickel alloys, and the like.

2, hot dip galvanized fasteners

Hot-dip galvanizing of fasteners involves immersing fasteners of carbon steel components in a bath of molten zinc at a temperature of about 510° C., so that the iron-zinc alloy on the surface of the fastener turns into passivation, thereby obtaining Surface treatment effect. The price of hot-dip galvanized fasteners is higher than that of electroplating, which is about 1.5 to 2 yuan per kilogram.

3, the mechanical plating of fasteners

Mechanical plating of fasteners means that the surface of the fastener is impacted by a certain physical and chemical means with a powder of a plated metal, so that the plated metal forms a coating on the surface of the fastener through a cold welding and reaches the surface. Treatment effect. The mechanical plating of fasteners is mainly applicable to spare parts such as screws, nuts, and gaskets.

The main purpose of the surface treatment of fasteners is to make the fasteners themselves obtain anti-corrosion capabilities, so as to increase the reliability and adaptability of the fasteners used. Therefore, the quality judgment of the surface treatment of the fasteners is mainly the inspection. Whether the fastener's anti-corrosion capability is effectively increased, and whether the increase is in line with the expected requirements.