The common methods of fastener surface treatment are as follows:
1, fasteners hot dip galvanized
Hot dip galvanization of fasteners is to immerse fasteners of carbon steel composition into a plating tank of dissolved zinc at a heat of about 510℃. In this way, the iron and zinc alloy on the surface of the fasteners will be converted to passivated zinc, thus obtaining a surface treatment effect. The price of hot dip galvanized fasteners is higher than electroplating, about 1.5 to 2 yuan per kilogram.
2. Mechanical plating of fasteners
Mechanical plating of fasteners refers to the impact of metal powder on the surface of fasteners by specific physical and chemical means, so that the coated metal can form a coating on the surface of fasteners through cold welding to achieve the surface treatment effect. Mechanical plating of fasteners is mainly used for spare parts such as screws, nuts and gaskets.
3. Electroplating of fasteners
The electroplating of fasteners refers to immerging the part of fasteners to be electroplated into a specific aqueous solution, which contains some deposited metal compounds. In this way, after passing the aqueous solution with an electric current, the metal substances in the solution are precipitated and attached to the immersed part of the fasteners. The plating of fasteners generally includes zinc plating, copper, nickel, chromium, copper nickel alloy and so on. Climb a net