The surface finish of high-clean stainless steel piping system plays a very important role in the safe production of food and drug. Good surface finish has the characteristics of cleanability, reduction of microbial growth, corrosion resistance, removal of metal impurities and so on. In order to improve the surface quality of the stainless steel piping system, that is, to improve the surface morphology and morphological structure, and to reduce the number of dielectric layers, the common surface treatment methods are as follows.
1. Mechanical grinding and polishing. Precision grinding to improve the surface roughness, can improve the surface structure, but will not improve the morphological structure, energy level and the number of layers.
2. Acid washing and polishing. Pipes after pickling and polishing, although it will not improve the surface roughness, but can remove the surface residual particles, reduce the energy level, but will not reduce the number of mesopelagic layers. On the surface of stainless steel to form a protective layer of chromium oxide passivation, to protect stainless steel from corrosion and oxidation.
3. Electrolytic polishing. Through electrochemical polishing, the surface morphology and structure can be improved to a greater extent, so that the actual area of the surface layer is reduced to a greater extent. The surface is a closed, thick film of chromium oxide, the energy is close to the normal level of the alloy, while the number of media will be reduced to a minimum.
Post time: Jan-04-2024