What are the methods of fastener surface treatment?

Update: 24-06-2020

Electroplating, hot dip galvanizing, and mechanical pla […]

Electroplating, hot dip galvanizing, and mechanical plating on the appearance of fasteners are the most widely used methods. The appearance of fasteners forms a covering process. After the fasteners are treated, they can show a more beautiful appearance. Appearance, the corrosion resistance of the fastener itself will also be improved. The more important intention is to enable the fasteners themselves to obtain anti-corrosion ability, so as to add the reliability and adaptability of the fasteners. Therefore, to judge the quality of the appearance of the fasteners, it is more important to check the anti-corrosion ability of the fasteners. Whether it is useful to add, and whether the range of addition meets the expected requirements.
1. Electroplating of fasteners
The plating of fasteners refers to immersing the parts of the fasteners that need to be plated into a specific aqueous solution. The aqueous solution will contain some accumulated metal compounds, so that after the current is passed through the aqueous solution, the metal substances in the solution are separated and attached On the immersed part of the fastener. The plating of fasteners generally includes zinc plating, copper, nickel, chromium, copper-nickel alloy, etc.
2. Hot dip galvanizing of fasteners
The hot-dip galvanizing of the fastener is to immerse the fastener made of carbon steel into the 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 converted to passivated zinc, and then Obtain the appearance processing effect. The price of hot dip galvanized fasteners is higher than that of electroplating, about 1.5 to 2 yuan per kilogram.
3. Mechanical plating of fasteners
Mechanical plating of fasteners refers to the use of specific physical and chemical means to impact the appearance of the fastener with the powder of the coated metal, so that the coated metal is cold welded to form a coating on the outer surface of the fastener to reach the appearance Treatment effect. The mechanical plating of fasteners is mainly suitable for spare parts such as screws, nuts and washers.


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