At present, there are hundreds of products on the market, such as rust steel, copper, aluminum, iron, aluminum alloy and other raw materials, which are processed by lathes and milling machines, and finally become various ideal parts after surface treatment. Several surface treatments can generally be divided into: painting, electroplating, polishing, etc.

1. painting: generally, painting process is used in the production of large hardware parts to avoid corrosion of hardware parts, such as large electrical appliance shells and handicrafts.

2. electroplating: the surface of hardware parts shall be treated by electroplating process to ensure that the product will not become moldy or rusty during long-term use. Commonly used in screws, auto parts and small parts.

3. polishing: the surface of hardware shall be polished to a smooth surface through the treatment of edges, corners and burrs, so as to avoid jamming and injury to the equipment during the use of parts. It is commonly used for hardware of daily necessities.