Operation process of blackening surface treatment in Dalian

Dalian blackening surface treatment+oiling is a popular coating for industrial fasteners because it is cheap and looks good before fuel consumption. Due to its blackening, it has almost no rust prevention ability, so it will rust quickly without oil. Even in the presence of oil, the salt spray test can only last for 3-5 hours.

The traditional blackening method is alkaline oxidation blackening. Alkaline oxidation blackening is usually achieved by using high temperature and nitrite as oxidants to heat and oxidize steel components in a concentrated alkaline oxidation solution, resulting in the formation of a blue to black Fe3O4 protective oxide film on the surface of the parts. This high-temperature oxidant often causes uneven heating and high temperature during blackening of the workpiece, resulting in rapid changes in solution content and uneven blackening film. So people are eager to seek a room temperature blackening process to save energy, reduce costs, simplify operation, and achieve uniform blackening film.

Operation process of blackening surface treatment in Dalian

Workpiece clamping → degreasing → cleaning → acid washing → cleaning → oxidation → cleaning → saponification → hot water boiling and washing → inspection.

Metal surface treatment technology can protect and strengthen the surface of workpieces without increasing or increasing too much cost, or repair old and processed workpieces, thereby improving the service life and reliability of products, improving the performance and quality of mechanical equipment, and enhancing the competitiveness of products. Therefore, metal surface treatment technology is of great significance for saving materials and energy.

Chemical treatment is a general term for the method of using chemical or electrochemical treatment to generate a layer of stable compounds on the surface of stainless steel. Electroplating, as we often say, uses electrochemical treatment. The use of acid solution, anodic dissolution (electrolysis), etc. alone or in combination for rust removal, as well as the use of phosphate treatment, chromate treatment, blackening, anodizing, etc. to form a protective film on the metal surface, all belong to this method. This method can achieve complex pattern effects and create retro or modern design requirements.