The quality of the surface treatment of the nut is mainly to check whether the anti-corrosion ability of the nut is effectively increased, and whether the increase is in line with the expected requirements. After the surface treatment of the nut, it can present a more beautiful appearance, and the corrosion resistance of the nut itself will be improved. The main purpose is to make the nut itself anti-corrosive, so as to increase the reliability and adaptability of the nut.
Electroplating, hot-dip galvanizing, and mechanical plating are the most common methods for nut surfaces, and we introduce them separately below.
1.Plating of nuts
Nut plating refers to immersing the portion of the nut that needs to be plated in a specific aqueous solution. The aqueous solution will contain some deposited metal compounds. After the current passes through the aqueous solution, the metal substance in the solution will precipitate and attach to the immersed part of the nut. on. Nut electroplating generally includes galvanizing, copper, nickel, chromium, copper-nickel alloy, etc.
2. Hot-dip galvanizing of nuts
The hot-dip galvanizing of nuts is to immerse a nut made of carbon steel into a zinc plating bath with a temperature of about 510 ° C. In this way, the iron-zinc alloy on the surface of the nut will be converted to passivated zinc, thereby obtaining a surface treatment effect.
3.Mechanical plating of nuts
Mechanical plating of nuts refers to the use of metal powder to impact the surface of the nut through specific physical and chemical means. In this way, the plated metal forms a coating on the surface of the nut by cold welding to achieve a surface treatment effect. Mechanical plating of nuts is mainly applicable to spare parts such as screws, nuts and washers.