To make stainless steel present a mirror effect, it can be achieved through mechanical polishing, chemical polishing, and electrolytic polishing.
Mechanical polishing
Mechanical polishing is the basic method, which can be achieved by a combination of rough grinding and fine grinding. First, use coarse-grained sandpaper or grinding wheel to grind the stainless steel surface to remove scratches, oxide scale, and roughness on the surface. This step can quickly improve the flatness of the surface, but it will leave more obvious wear marks. After that, switch to fine-grained sandpaper or a polishing wheel for fine-grinding. Start with relatively coarse fine sandpaper and gradually transition to finer sandpaper to continuously reduce the size of the wear marks. Finally, use wool wheels and polishing paste for fine polishing to further improve the surface finish and make the stainless steel surface close to the mirror effect.
Chemical polishing
Chemical polishing is to immerse stainless steel in a specific chemical solution, remove the microscopic protrusions on the surface through a chemical reaction, and make the surface smooth. Choose the appropriate chemical polishing liquid according to the material and specific requirements of the stainless steel. Completely immerse the stainless steel workpiece in the polishing liquid and control the temperature and time. Too high a temperature or too long a time may cause over-corrosion and affect the surface quality; too low a temperature or too short a time will not result in an obvious polishing effect. During the polishing process, the solution should be stirred continuously to ensure uniform polishing. Chemical polishing can process workpieces with complex shapes, but the polishing effect may not be as good as mechanical polishing and electrolytic polishing.
Electrolytic polishing
Electrolytic polishing is to use the electrochemical principle to use stainless steel as an anode and put it into an electrolyte for electrolysis. Under the appropriate current density and time conditions, the metal on the anode surface dissolves, and the microscopic protrusions dissolve faster than the concave parts, making the surface smooth and bright. Electrolytic polishing can obtain high-quality mirror effects with good surface uniformity. However, it is necessary to pay attention to controlling the composition, concentration, temperature, and current density of the electrolyte to ensure a stable polishing effect.