Three Important Methods Of Fastener Surface Treatment

Surface treatment of fasteners refers to the process of forming a covering layer on the surface of fasteners by certain methods. After surface treatment, the fastener can show a more beautiful appearance, and the corrosion resistance of the fastener itself will be improved. The surface treatment methods of fasteners are as follows.

Plating of fasteners

Electroplating of fasteners refers to immersing the parts that need to be electroplated into a specific aqueous solution, which will contain some deposited metal compounds. In this way, after passing an electric current through the aqueous solution, the metal substances in the solution will be precipitated and attached to the immersed part of the fastener. The plating of fasteners generally includes galvanized, copper, nickel, chromium, copper-nickel alloy, etc.

Hot dip galvanizing of fasteners

Hot dip galvanizing of fasteners is to dip fasteners of carbon steel components into a bath of dissolved zinc with a heat of about 510℃. In this way, the iron-zinc alloy on the surface of fasteners will be changed into passivated zinc, so as to obtain the surface treatment effect. The price of hot-dip galvanizing fasteners is higher than electroplating, about 1.5 to 2 yuan per kilogram.

Mechanical plating of fasteners

Mechanical plating of fasteners means to impact the surface of fasteners with powder of coated metal by specific physical and chemical means so that coated metal can form a coating on the surface of fasteners by cold welding to achieve a surface treatment effect. Mechanical plating of fasteners is mainly suitable for spare parts such as screws, nuts, and gaskets.

The main purpose of surface treatment of fasteners is to make the fasteners themselves obtain anti-corrosion ability, so as to increase the reliability and adaptability of fasteners. Therefore, the quality judgment of fastener surface treatment is mainly to check whether the corrosion resistance of the fastener is increased effectively and whether the increased range is in line with the expected requirements.

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