Electroplating, hot dip galvanizing, and mechanical plating on the surface of the fastener are the most common methods. The process of forming a covering layer on the surface of the fastener. After the surface treatment of the fastener, it can appear more beautiful. Appearance, the corrosion resistance of the fastener itself will also be improved.
The main purpose is to enable the fastener itself to obtain corrosion resistance, so as 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 the increase is effective, and whether the increase is in line with the expected requirements.
The plating of fasteners refers to immersing the parts of the fastener that need to be plated into 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 immersed part of the fastener. The plating of fasteners generally includes zinc plating, copper, nickel, chromium, copper-nickel alloy, etc.
Hot-dip galvanizing of fasteners is to immerse fasteners made of carbon steel into a molten zinc plating bath with a heat of about 510°C, so that the iron-zinc alloy on the surface of the fastener will be transformed into passivated zinc, thus Obtain the surface treatment effect. The price of hot dip galvanized fasteners is higher than that of electroplating, about 1.5 to 2 yuan per kilogram.
Mechanical plating of fasteners refers to the use of specific physical and chemical means to impact the surface of the fasteners 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 reach the surface Treatment effect. The mechanical plating of fasteners is mainly suitable for spare parts such as screws, nuts and washers.
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