The materials needed for stainless steel polishing generally include: "polishing wax, hemp wheel, nylon wheel, cloth wheel, wind wheel, wire cloth wheel" and so on.
chemical polishing
Chemical polishing is a common surface treatment process for stainless steel. Compared with electrochemical polishing process, its biggest advantage is that it does not need DC power supply and special fixture, and can polish complex parts with high productivity. As far as functionality is concerned, chemical polishing can not only obtain a surface with physical and chemical cleanliness, but also remove the mechanical damage layer and stress layer on the stainless steel surface to obtain a surface with mechanical cleanliness, which is beneficial to prevent local corrosion of parts, improve mechanical strength and prolong the service life of parts. Since the patent of chemical polishing of stainless steel was issued in the early 1940s, many formulations have been disclosed so far, but it is still difficult for people to apply them in practice. Because there are many kinds of stainless steel, different brands of stainless steel have different corrosion laws, and it is impossible to use the same solution, so there are many kinds of chemical polishing solutions for stainless steel.
The basic components of chemical polishing solution include etchant, oxidant and water. Corrosive agent is the main component. If the stainless steel is dissolved in the solution, it cannot be polished. Oxidants and additives can inhibit this process and make the reaction proceed in a direction conducive to polishing. Water can adjust the concentration of solution and facilitate the diffusion of reaction products. Whether the chemical polishing of stainless steel can be carried out smoothly depends on the reasonable cooperation of the above components.
electropolishing
Electrolytic polishing of stainless steel is to hang stainless steel products on the anode and electrolyze them in electrolytic polishing solution. Electrolytic polishing is a special anodic process. In the whole process of anodic electrolytic polishing, there are two contradictory processes on the surface of stainless steel products, that is, the continuous formation and dissolution of oxide film on the metal surface. However, the conditions for forming a passive chemical film on the convex and concave parts of stainless steel products are different. Due to the dissolution of the anode, the concentration of metal salts in the anode area increases continuously, forming a thick and high-resistivity mucosal layer on the surface of stainless steel products. The thickness of thick mucosa on the surface of the product is different, which makes the current distribution on the anode micro-surface uneven The current density at the micro-bumps is high and the dissolution is fast, so that the burrs or micro-bumps on the surface of the product are dissolved first to achieve flatness; The current density in the depression is small and the dissolution is slow. Due to the different current density distribution, the surface of the product is continuously formed and dissolved at different rates. At the same time, the anode surface is subjected to two opposite processes of film formation and dissolution, and the passive film is continuously generated and dissolved, so that the surface of stainless steel products is smooth and shiny, and the purpose of polishing and finishing the surface of stainless steel products is achieved.