List the three most commonly used methods of fastener surface treatment

List the three most commonly used methods of fastener surface treatment
Electroplating, hot-dip galvanizing, and mechanical plating are the most common methods used to form a covering layer on the surface of fasteners. After surface treatment, fasteners can present a more beautiful appearance. Externally, the corrosion resistance of the fastener itself will also be improved. The more important purpose is to make the fastener itself obtain anti-corrosion ability 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 anti-corrosion ability of the fastener. Whether the increase is effective, and whether the increase meets the expected requirements.

1. Electroplating of fasteners The electroplating of fasteners refers to immersing the part of the fastener that needs to be electroplated in a specific aqueous solution. The aqueous solution will contain some deposited metal compounds, so that after the current is passed through the aqueous solution, the metal substances in the solution are precipitated and attached to the surface. on the immersed part of the fastener. Electroplating of fasteners generally includes galvanized, copper, nickel, chromium, copper-nickel alloy, etc.

2. Hot-dip galvanizing of fasteners The hot-dip galvanizing of fasteners is to immerse the fasteners of carbon steel components into a bath of molten zinc at a temperature of about 510 ° C, so that the iron-zinc alloy on the surface of the fasteners will be converted into passivated zinc, thereby Get a finish. The price of hot-dip galvanizing treatment for fasteners is higher than that of electroplating, which is about 1.5 to 2 yuan per kilogram.

3. Mechanical plating of fastenersThe mechanical plating of fasteners refers to impacting the surface of the fasteners with the powder of the coating metal through specific physical and chemical means, so that the coating metal forms a coating on the surface of the fasteners through cold welding to reach the surface. processing effect. Mechanical plating of fasteners is mainly applicable to spare parts such as screws, nuts and washers.

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