Stainless steel passivation
Stainless steel passivation technology is to make stainless steel interact with oxidizing medium, usually heavy metal salt solution or nitric acid solution, and generate a passivation film on the surface of stainless steel with small thickness but very dense, good coverage performance, and can be firmly attached to the metal surface.
The chemical composition of passive film is usually metal oxide, which can well isolate metal and corrosive medium, avoid contact between them, and effectively prevent metal corrosion.
Stainless steel passivation technology is very beneficial to improve the stability of stainless steel in environmental media. It can effectively prevent local corrosion of stainless steel. Not only that, this technology can also bring enough cleanliness to the stainless steel surface and eliminate the hot work products generated on the stainless steel surface.
At present, stainless steel passivation technology is widely used in aerospace, mobile communication, glasses, clocks, auto parts, precision hardware, medical devices, food machinery, fasteners and other industries, for processing stainless steel fasteners, precision castings, as well as cutting, stamping, tapping, wire drawing, welding and other processing products.
Electrolytic polishing of stainless steel
Stainless steel electropolishing technology is a technology that takes stainless steel workpiece as anode and insoluble metal as cathode to achieve selective anode dissolution through pain points in electrolyte, so as to make the workpiece surface flat and bright.
In practice, immerse the two poles into the electrolytic cell at the same time and apply direct current. The stainless steel workpiece of the anode will form soluble metal ions due to the loss of electrons. Because this process mainly occurs in the convex position of the metal surface, it can make the workpiece surface more flat. After the ion is separated from the workpiece, it will combine with the phosphoric acid in the electrolyte to form a layer of phosphate film, which is attached to the workpiece surface, which further increases the flatness of the workpiece surface and brings a bright effect at the same time.
Stainless steel electropolishing technology can promote the surface of stainless steel workpiece to be consistent in color, clean and bright, durable in luster, and clear in appearance. If the workpiece is processed with thread, the burr in the thread can dissolve and fall off in the electrolytic process, effectively preventing the phenomenon of biting between threads. The electropolished surface can obtain stronger corrosion resistance. Moreover, compared with mechanical polishing, this chemical exposure technology has higher production efficiency and lower production cost.
Stainless steel electropolishing technology is mainly used in the processing and manufacturing of biochemical, pharmaceutical, chemical equipment and piping; Processing and manufacturing of food, beverage, pure water and ultra clean water production equipment; And the processing and manufacturing of equipment in the cosmetics and washing supplies industry. In addition, this technology has also played an important role in the processing of ultra pure and high vacuum equipment and its piping used in semiconductor process, and equipment in dye, coating, ink production industry and printing and dyeing industry.