After metal stamping and forming, surface treatment processes are often required to enhance the physical properties of the stamped parts, thereby achieving higher processing standards. Some surface treatments improve aesthetic appearance, while others increase acidity or alkalinity, or conductivity, etc. This article primarily describes the purposes achieved by different surface treatments.

Electroplating

Electroplating is a process that involves attaching a layer of metal to the surface of another metal, serving to prevent corrosion, enhance weldability, conductivity, and improve aesthetics. Typically, electroplating is done with gold, silver, nickel, zinc, and tin.

Advantages: Post-plating, the surface exhibits high luster and an aesthetically pleasing metallic appearance, making it a surface treatment process suitable for the majority of electronic components.

2: Anodizing

Primarily involving anodizing in aluminum materials, this process employs electrochemical principles to form an aluminum oxide film on the surface of aluminum and aluminum alloys. This oxide layer boasts protective, decorative, insulating, and wear-resistant properties.

Advantages: Enhances strength and allows for any color except white. Achieves nickel-free sealing, meeting the nickel-free requirements of countries in Europe and the Americas.

Electrophoresis

For stainless steel, aluminum alloy, and other metals, it can impart various colors to products while maintaining metallic luster, enhancing surface properties, and offering good corrosion resistance.

Advantages: Capable of multi-color surface treatments, and can achieve surface finishes with complex structures; also compatible with subsequent processes such as sandblasting, polishing, and brushing.

4. Micro-arc oxidation

The process of generating a ceramicized surface film by applying high voltage in an electrolyte solution (usually a weakly alkaline solution), which is a result of the synergistic action of physical discharge and electrochemical oxidation.

Advantages:

Ceramic texture, commonly used for aesthetics, offers excellent heat dissipation; however, it is limited by its single color and high cost.

5. PVD Vacuum Deposition

Physical Vapor Deposition (PVD) is a technology primarily utilizing physical processes to deposit thin films.

Advantages: High-hardness and wear-resistant metal ceramic decorative coating can be plated on metal surfaces.

6. Powder Coating

Powder coatings are applied to the surface of workpieces using a spray gun (electrostatic powder coating machine). Under the influence of static electricity, the powder adheres evenly to the workpiece surface, forming a powdery coating. This powdery coating is then baked at a high temperature to flatten and cure, resulting in a variety of finishes depending on the type of powder coating used.

Advantages: Rich in color options, with both glossy and matte finishes available; low cost, suitable for architectural furniture products, case shells, and strong defect covering capabilities.

7. Metal Wire Drawing

It is a surface treatment method that creates linear patterns on the workpiece surface through grinding, achieving a decorative effect. The patterns after the brushing process can be categorized into: straight line brushing, random line brushing, wavy, and spiral patterns.

Advantages: The brushed finish imparts a non-reflective metallic luster to the metal surface while also eliminating minor imperfections on the surface.

8. Sandblasting

A process utilizing compressed air as the power source, which forms a high-speed jet beam to spray material at high velocity onto the surface of the workpiece to be treated, altering the surface's exterior or shape, and achieving a certain degree of cleanliness and varying roughness.

Advantages: Achieves various reflective or matte finishes. Can smooth out minor burrs on workpiece surfaces, resulting in a flatter finish.

Polishing

Polishing the workpiece surface using flexible polishing tools and abrasive particles or other polishing media.

Advantages: Maintains all physical properties of the material, serves as a pre-treatment process for other surface treatments.