Commonly used treatments for stainless steel polishing
What are the common treatment methods for stainless steel polishing?
1) Internal surface polishing (using internal polishing machine):
The throwing rod extends into the pipe to drive a thousand impellers or self-made abrasive belt wheels to rotate at high speed, and the steel pipe itself rotates for polishing, and the throwing rod rotates slowly while advancing. Generally speaking, 60#-80# thousand impellers or abrasive belt wheels are used for rough polishing first, and then high-precision fine polishing is gradually carried out according to the requirements of smoothness. Generally, a thousand impellers are used for large-diameter pipes above 6", and self-made abrasive belt wheels can be used for small-diameter pipes, which can reduce costs.
2) External surface polishing (using external polishing machine):
The external throwing material informs the rotation, and along with the rotation of the steel pipe itself, it moves forward for polishing. The reason is the same as inner polishing. If you feel that mechanical polishing is not bright enough, you can apply polishing paste appropriately to increase the brightness during polishing.
3) Feather cloth polishing:
Although the Ra value may be good, many cracks can be observed under the electron microscope, the actual surface area is increased, and there are separated ferrite and martensite structures in some places. There are many impurities on the surface, such as abrasive particles. Because of the use of polishing paste, a lot of energy is stored in the original grooves, so the amount of media is also increased. Such pipes are generally not permitted for use in sensitive and corrosive media in microelectronics, optoelectronics and biopharmaceuticals.
4) Sub-electrochemical polishing:
On the basis of BA, the European factory has carried out a surface treatment process, that is, a mild electrolytic polishing process to minimize the surface area and thicken the passivation film, thereby increasing corrosion resistance, improving surface morphology and structure, and reducing energy levels . After this surface treatment, the surface quality of the product is greatly improved, although not as bright as before. No particles will be generated, and the composition of surface iron and iron oxide will be reduced.