1. Wear resistance, abrasion resistance and high hardness.

2. Compact structure, no defects, and small porosity.

3. It is firmly separated from the metal substrate and has good adhesion.

4. Evenly dispersed, with a certain thickness.

Generally, the protective layer is divided into two types: metal coating and non-metal coating. Metal coating refers to the formation of a protective layer on the surface of simple corroded metal with a metal or alloy with strong corrosion resistance. This kind of coating is also called Plating. There are many methods and types of metallization plating. Among them, fastener manufacturers commonly use electroplating, followed by molten metal immersion plating (hot dip) and chemical surface treatment. Non-metallic coating refers to the formation of a protective layer on the surface of metal equipment or components, such as coatings, and inorganic materials, such as ceramics, these organic polymer materials, which can isolate the metal from the surrounding medium without any barriers, and avoid the base metal Corrosion is formed by touching it.