1. Passivation

The non-standard screw passivation treatment is to dissolve the iron contaminants hidden on the screw in the passivation process, and change the surface of the non-standard screw to a passivation protective film, which can keep the non-standard screw from being corroded. Electronic devices use general passivation surface treatment methods.

Advantages of passivation of non-standard screws: After passivation of non-standard screws, the specifications, models and colors of non-standard screws have not changed much. Most of the oil inlet joints of automobile vacuum pumps can maintain the original state of non-standard screws. The passivation treatment of non-standard screws removes the pollutants on the surface of non-standard screws, which can improve the anti-rust treatment ability and corrosion resistance of screws. The passivation treatment of non-standard screws is more economical and cost-effective than the surface treatment method of gender, because the passivation treatment of non-standard screws is realized without chemical reaction.

2. Galvanized/hot-dip galvanized

Non-standard screw surface plating or hot-dip galvanizing can improve the corrosion resistance of screws, but different electroplating process layers can produce different corrosion resistance levels. If you want to know the level of its corrosion resistance, you can test its corrosion resistance level according to the salt spray test. The characteristics of non-standard screws with plating/hot galvanizing are: the surface plating/hot galvanizing of non-standard screws can improve the corrosion resistance of non-standard screws. The 72-hour rust-free salt spray test can also improve the smoothness of the surface of non-standard screws.

3. Non-standard screw parts plated with aluminum alloy/zinc non-ferrous metal are generally standard screw parts with high requirements for anti-rust treatment capability. Surface solutions of zinc non-ferrous metals can then be tested according to a salt spray of up to a thousand hours.

4. Electrophoresis principle Electrophoresis surface solution is to use electrophoresis technology to evenly cover paint, natural latex, plastic and other particles on the surface of non-standard screw standard parts. After the surface is solved according to the electrophoresis principle, the coating on the surface of the non-standard screw is plump, symmetrical, flat and smooth.

5. Spraying Use a spray gun to apply a layer of colored chromatography on the standard parts of non-standard screws on average, and change the non-standard screws into a large number of different colors, which are mainly used to decorate the appearance of non-standard screws. Spraying is also mainly used in the field of electronic equipment.