Rust problems and surface treatment solutions in sheet metal processing

In modern manufacturing, sheet metal processing is widely used because of its light and strong characteristics. However, sheet metal products are prone to rust during processing, transportation and use, which not only affects the appearance of the product, but may also reduce its durability and performance. Therefore, effective surface treatment technology has become the key to solving the problem of sheet metal rust.

1. Causes of sheet metal rust

There are many reasons for the rust of sheet metal processing products. Common reasons include the chemical properties of the material itself, residues during processing, and environmental factors. For example, ordinary carbon steel materials such as cold rolled sheets (SPCC) and hot rolled sheets (SPHC) are prone to rust, while stainless steel (such as SUS304) has good rust resistance. In addition, residual acid and alkali substances, oil stains or untreated oxide scale during processing can also cause rust.

2. Surface treatment technology

In order to effectively solve the problem of sheet metal rust, we provide a variety of advanced surface treatment processes to ensure the corrosion resistance and aesthetics of sheet metal products.

(1) Sandblasting

Sandblasting is a process that removes oxide scale, rust and impurities on the surface of sheet metal by spraying sand particles at high speed. It can not only clean the surface, but also make the surface obtain a certain degree of roughness, thereby enhancing the adhesion of subsequent coatings. The surface of the sheet metal after sandblasting can form a dense oxide film, further enhancing its corrosion resistance.

(2) Laser cleaning

Laser cleaning is an efficient and environmentally friendly surface treatment technology. It uses a high-energy laser beam to instantly evaporate the dirt and rust on the surface of the sheet metal, without the need for physical contact and chemical cleaning agents, thus avoiding damage to the surface of the sheet metal. The laser cleaning machine can select different powers according to the thickness and size of the sheet metal. For example, a 1500W laser cleaning machine is suitable for sheet metal surfaces within the range of 1-80mm.

(3) Plastic spraying and baking paint

Plastic spraying and baking paint are common surface coating processes. Plastic spraying uses high-voltage electrostatic equipment to adsorb plastic powder on the surface of the sheet metal, and forms a uniform and firm coating after heating and curing. Baking paint forms a protective film through spraying and high-temperature baking, enhancing the corrosion resistance and wear resistance of the sheet metal. These processes can not only effectively prevent rust, but also improve the appearance and texture of the product.

(4) Chemical treatment

Chemical treatment includes pickling, phosphating and passivation. Pickling can remove the oxide scale and rust on the surface, but the time and acid concentration need to be strictly controlled. Phosphating can form a phosphate conversion film on the surface of the sheet metal, which improves the surface adhesion and corrosion resistance. Passivation treatment forms a dense oxide film on the surface through chemical reaction, which further enhances the rust resistance.

3. Our advantages

In the field of sheet metal processing, we focus on solving rust and surface treatment problems and have accumulated rich experience. We use advanced equipment and technology, such as laser cleaning machines, sandblasting equipment and automated plastic spraying production lines to ensure that every sheet metal product can meet high quality standards. In addition, we also provide customized surface treatment solutions and select appropriate processes and materials according to customer needs.

4. Conclusion

Sheet metal rust is a common problem, but through scientific surface treatment technology, the service life of sheet metal products can be effectively extended and their appearance quality can be improved. With a professional technical team and advanced equipment, we are committed to providing customers with high-quality sheet metal processing services to solve your rust and surface treatment problems.