Screws are commonly used in machinery, electrical appliances and buildings. They are generally made of metal, cylindrical in shape, with concave and convex grooves carved on the surface, such as an inclined surface surrounding the side of the screw, so that the screw can tightly lock the screw cap or other objects. What is the surface treatment process of screws? Now let's explain it to you!

Surface treatment process of screws

1、 Type of surface treatment:

Surface treatment refers to the process of forming a coating on the surface of the workpiece by a certain method. Its purpose is to give a beautiful and anti-corrosion effect to the surface of the product. The surface treatment methods are summarized in the following ways:

1. Electroplating: immerse the parts to be electroplated in an aqueous solution containing the deposited metal compound, and use current to pass through the plating solution to precipitate and deposit the electroplated metal on the parts. General electroplating includes zinc plating, copper, nickel, chromium, copper nickel alloy, etc,

Sometimes boiling black (bluing) and phosphating are also included.

2. Hot dip galvanizing: It is completed by immersing carbon steel parts in a bath of molten zinc with a temperature of about 510 ℃. The result is that the iron zinc alloy on the surface of the steel piece gradually becomes the passive zinc on the outer surface of the product. Hot dip aluminizing is a similar process.

3. Mechanical plating: impact the product surface with particles of coated metal, and cold weld the coating to the product surface.