China Surface Treatment Factory

The surface treatment process of metal castings and forgings mainly targets surface defects generated during casting and forging, such as scale, burrs, pores, etc., and improves its surface quality and performance through different treatment methods, and enhances its corrosion resistance, wear resistance and fatigue resistance.

The metal surface is rubbed by mechanical equipment and polishing agent to remove the uneven surface and make it smoother. It is suitable for castings and forgings with high requirements for surface finish, such as precision mechanical parts.

The metal surface is impacted by high-speed sprayed sand particles to remove surface oxide scale, dirt and burrs, while increasing surface roughness and improving the adhesion of subsequent coatings.

The oxide scale, rust and dirt on the metal surface are removed by acidic solutions (such as sulfuric acid, hydrochloric acid, etc.). Pickling can not only clean the surface, but also provide a good adhesion basis for subsequent phosphating, electroplating or spraying processes.

Phosphating treatment is a surface treatment process that forms a layer of phosphate film on the metal surface. It is often used to enhance the corrosion resistance of castings and forgings. The phosphate film has good anti-corrosion performance and can serve as a base layer for coating adhesion to improve the durability of subsequent coatings. Phosphating treatment is commonly used for castings and forgings in industries such as automobiles, machinery and home appliances.

· Zinc phosphating

· Iron phosphating

A layer of metal (such as nickel, zinc, chromium, etc.) is plated on the metal surface through an electrolytic reaction to form a uniform coating with good corrosion resistance, wear resistance and decorative properties. Electroplating technology is often used for surface treatment of automotive parts, electronic equipment and tools.

· Zinc Plating

· Chromium Plating

· Gold/Silver Plating

Unlike electroplating, chemical plating does not rely on external current, but deposits a coating on the metal surface through chemical reaction. Chemical plating is often used for complex parts that require uniform coatings. It can avoid problems such as uneven current distribution in electroplating and is widely used in precision parts, electronic components and other fields.

· Anodizing

· Electroless Nickel Plating

A surface treatment method that sprays the paint in the form of aerosol onto the surface of metal or other substrates. Spraying technology is often used to improve the corrosion resistance, wear resistance, decorativeness and oxidation resistance of materials.

The spraying process can not only effectively improve the functionality and aesthetics of the substrate, but also provide a variety of coating thicknesses and performances according to different needs.

· Powder Coating

· Liquid Coating

· Thermal Spraying

The metal surface is irradiated with a high-energy laser beam to quickly heat and change the microstructure of the surface metal, thereby improving its wear resistance, hardness, fatigue resistance and other properties. Laser melting spraying, laser surface hardening and other technologies are often used for surface treatment of castings and forgings with high precision requirements, especially in aviation, aerospace, molds and tools.

By penetrating or diffusing metal atoms into the surface of castings and forgings, an alloy layer with special properties is formed. Common surface metallization processes include aluminizing, carburizing, nitriding, etc. Through these processes, the wear resistance, corrosion resistance and high temperature resistance of the surface of castings and forgings can be significantly improved, and they are often used for surface treatment of engine parts, tools and molds.

· Aluminizing

· Carburizing

· Nitriding