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. 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.
Electrochemical polishing
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.
Precautions:
Grinding with sandpaper or abrasive belt is basically a grinding and cutting operation, which will leave fine lines on the surface of steel plate. When using alumina as abrasive, I was in trouble, partly because of pressure.
Any grinding parts of the equipment, such as abrasive belt and grinding wheel, shall not be made of other non-stainless steel materials before use. Because it will pollute the stainless steel surface. In order to ensure the consistency of surface processing, the new grinding wheel or abrasive belt should be tried on the waste with the same composition first, so as to compare similar products.
These are the most commonly used polishing methods for stainless steel at present. Chemical polishing is generally used for surface treatment of stainless steel, which can efficiently polish very complicated parts, usually with the help of chemicals. Polishing has a great influence on the effect of stainless steel. If the polishing effect is not good, it will directly affect the performance. Electrochemical polishing is carried out by using the principle of point solution, and the effect is also very good. Generally, the polishing method is selected according to the use and shape of stainless steel.
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