Three important methods of screw surface treatment are introduced

The surface treatment of the screw refers to the process of forming a covering layer on the surface of the screw by some methods. After the surface treatment of the screw, it can show a more beautiful appearance, and the anti-corrosion ability of the screw itself will also be improved. Today, Xiaobian will introduce to you the main surface treatment methods of screws.

1. Electroplating of screws

The electroplating of screws refers to immersing the part of the screw that needs to be plated in a specific aqueous solution. The aqueous solution will contain some deposited metal compounds, so that after passing the current through the aqueous solution, the metal substances in the solution are precipitated and attached to the immersed part of the screw. superior. The electroplating of screws generally includes zinc, copper, nickel, chromium, copper-nickel alloys, etc.

2. Hot dip galvanizing of screws

The hot-dip galvanizing of screws is to immerse the carbon steel screw into a zinc-melting bath with a heat of about 510°C, so that the iron-zinc alloy on the screw surface will be converted into passivation zinc, so as to obtain the surface treatment effect.

3. Mechanical plating of screws

The mechanical plating of screws refers to impacting the surface of the fastener with the powder of the coated metal by specific physical and chemical means, so that the coated metal forms a coating on the surface of the screw in the form of cold welding to achieve the surface treatment effect. Mechanical plating of screws is mainly suitable for spare parts such as screws, nuts and washers.

The main purpose of the surface treatment of the screw is to obtain the anti-corrosion ability of the screw itself, so as to increase the reliability and adaptability of the use of the screw. Therefore, the quality judgment of the surface treatment of the screw is mainly to check whether the anti-corrosion ability of the screw is effectively increased. , and whether the increase is in line with the expected requirements.