Analysis of surface treatment processes for Stainless steel stamped parts

After rolling, bending, welding, and high-temperature processing, a hard gray black oxide layer is easily formed on the surface of Stamping 304 stainless steel, mainly composed of nickel chromium oxide. This oxide layer not only damages the overall appearance and texture of the product, but also weakens the corrosion resistance of the stainless steel itself.

In order to optimize the surface appearance, improve dimensional stability, and extend the service life of components, standardized surface processing is generally required for Stainless steel sheet metal stamping. At present, the mainstream processing methods in the industry are mainly divided into three categories: surface whitening treatment, mirror gloss treatment, and protective coloring treatment. They can be flexibly matched and adapted to the process plan based on the structural shape, dimensional accuracy, and appearance standards of the workpiece.

The core function of surface whitening treatment is to remove the oxide scale, oil stains, and various impurities on the surface of Custom stainless steel stamping, restore the original silver white matte texture of stainless steel, and strengthen the basic anti-corrosion ability. The traditional strong acid corrosion process has been gradually phased out due to serious pollution, health hazards, and high operating costs.

The current mainstream is divided into two categories: physical treatment and environmentally friendly chemical treatment: shot blasting and sandblasting rely on physical impact to peel off the surface oxide layer, suitable for large-sized and structurally complex irregular Stainless metal stamping; The environmentally friendly pickling and passivation, neutral and non-toxic cleaning process can be operated at room temperature, which can uniformly restore the natural color of stainless steel without material damage. It is suitable for various precision small parts and complex structural parts, with uniform color and wide applicability after treatment, and is currently the most popular green processing method in the manufacturing industry.

Mirror polishing is mainly used to improve the surface smoothness and glossiness of 304 stainless steel punching. According to the processing principle, it can be divided into three forms: mechanical polishing, chemical polishing, and electrochemical polishing. Mechanical polishing products have high brightness and smooth surface, but require high manual labor and have weak environmental friendliness. They are more suitable for small and medium-sized conventional workpieces with simple structures, and complex shaped parts are difficult to achieve uniform polishing.

Chemical polishing is easy to operate, has high production efficiency, and low processing costs. It can be adapted to OEM stainless steel stamping parts with irregular and porous positions. Its disadvantage is that the surface gloss performance is average, and it is mostly used in small batch processing scenarios with low appearance requirements. Electrochemical polishing process is stable and controllable, with low pollution level. The finished mirror effect is durable and long-lasting, with excellent comprehensive cost-effectiveness. It is widely used in precision stainless steel stamping parts with high brightness requirements and long-term working conditions.

Coloring treatment can not only enrich the visual color of Stainless steel zinc plating drawing stamping parts, enhance product decoration and added value, but also simultaneously enhance the surface wear resistance and acid alkali corrosion resistance. It is widely used in decorative hardware, automotive parts, high-end equipment components and other fields. Common coloring techniques include ion deposition oxidation, high-temperature oxidation, chemical oxidation, electrochemical oxidation, and gas-phase cracking.

The ion deposition process has strong color stability and is suitable for large-scale standardized production of Stainless steel clips, but the equipment investment cost is relatively high; The high temperature, chemical and electrochemical oxidation technology is mature, and through precise parameter control, a uniform and firm coloring protective layer can be formed, with the widest commercial application range; The gas-phase cracking process is cumbersome and has a high production threshold, and its industrial application is currently limited.

If you need a surface treatment plan that matches the material, structure, and operating conditions of the workpiece, or the option of Stainless steel stamped parts, you can consult and communicate at any time to obtain professional and reasonable process advice and complete supporting services.