What are the surface treatment methods for sheet metal products?

发布时间：2024-04-11

The common surface treatment methods for sheet metal include wire drawing, sandblasting, painting, powder spraying, electroplating, anodizing, and screen printing.

Due to the lack of rust and corrosion resistance on the surface of certain sheet metal materials, effective surface treatment is essential. Surface treatment of sheet metal parts can improve the service life of products in harsh environments, or achieve specific surface effects or functions.

1. Wire drawing

The so-called sheet metal drawing is to place the material between the upper and lower rollers of the drawing machine, with a sand belt attached to the rollers. The material is driven by a motor to pass through the upper and lower sand belts and leave marks on the surface of the material. The thickness of the marks varies depending on the sand belt, and the main purpose is to beautify the appearance. Generally, the surface treatment method of drawing is only considered for aluminum materials.

Additionally, wire drawing is also known as wiping lines!

2. Sandblasting

By using the wind power of the sandblasting machine to strike sand particles onto the surface of the workpiece, a dense layer of pits is formed on the surface of the workpiece. Its main function is to remove dirt and dirt from the surface of the workpiece, increase its adhesion, and prepare for subsequent surface treatment methods.

3. Paint baking and powder spraying

The most well-known one is the baking paint of cars.

By spraying, high-temperature baking, and other methods, a layer of various colors of paint is sprayed on the surface of the material to beautify the appearance and increase the corrosion resistance of the material. It is a commonly used surface treatment method. There are generally two types of paint: liquid paint and powder paint, with powder paint being the most common The painted surface is non-conductive. Areas with EMC requirements are not allowed to be painted.

Main technical indicators: color difference, film thickness, and glossiness.

4. Electroplating

By chemical reaction, a layer of other metals is attached to the surface of the material to enhance its corrosion resistance and achieve a certain beautification effect. It is a commonly used surface treatment method, such as electroplating zinc, electroplating nickel, etc.

Mainly plated with colorful zinc, blue white zinc, black zinc, and chromium.

5. Anodization

Oxidize the metal on the surface of the workpiece to form a dense protective film, which increases the corrosion resistance of the workpiece. There are generally two methods: chemical oxidation and anodic oxidation. It is a commonly used surface treatment method, usually including primary color anodizing and black anodizing.

6. Silk screen printing

There are generally two methods for screen printing various markings on the surface of materials: flat screen printing and transfer printing. The main principle is the same as the camera film imaging principle, which is also an exposure process. Flat screen printing is mainly used on general flat surfaces, but if there are deeper pits in the area, transfer printing is needed.

Usually used in trademarks, usage signs, warning signs, etc.

Based on the above, we can see that although sheet metal is commonly used, there are only a few types. But with appropriate surface treatment, many patterns can also be transformed. Simultaneously serving both aesthetic and protective functions.