Polished Stainless Steel Tubing
Date:2017-07-25 keywords:Polished stainless steel tubing, polishing, stainless steel tubing
Stainless steel tubing is widely used for its high corrosion resistance and decorative properties, especially in medical equipment, food industry appliances, tableware, kitchen utensils and other aspects of universal access and promotion. Stainless steel appliances should be corrosion, the appearance of light and clean, utensils should not be attached to the surface of toxic substances on the human body. Therefore, the production of such equipment surface treatment requirements, is to completely remove the surface of harmful substances.
Reason of oxidation
Stainless steel tubing in the hot processing, machining or place a certain time after the surface will form a layer of black or gray oxide, the main components of Cr2O3, NiO and very insoluble FeO, Cr2O3. There are a lot of reports about the removal of stainless steel tubing and the surface treatment of light ornaments. Stainless steel tubing polishing as a mature surface treatment method, has been widely used, polishing can further improve the corrosion resistance of stainless steel and bright effect.
Chemical polishing is a common surface treatment process for stainless steel. Compared with the electrochemical polishing process, the biggest advantage is that it does not require DC power supply and special fixture, which can polish the complex parts with high productivity. In terms of functionality, chemical polishing, in addition to the physical and chemical cleanliness of the surface, but also to remove the stainless steel surface of the mechanical damage layer and stress layer, get the mechanical cleanliness of the surface, which is conducive to prevent local corrosion parts Mechanical strength, to extend the service life of parts. Since the early 40s of the century has been on the chemical polishing of stainless steel patents, so far, many formulations have been made public, but people in practice is still very difficult. Because stainless steel variety, different grades of stainless steel with different corrosion laws, can not use the same solution, so there are many types of stainless steel chemical polishing solution.
The basic composition of the chemical polishing solution includes etchants, oxidants and water. The etchant is the main ingredient, and if the stainless steel is dissolved in the solution, the polishing can not be carried out. The oxidizing agent and the additive can inhibit the process so that the reaction is carried out in a direction favorable for polishing. Water regulates the concentration of the solution to facilitate the diffusion of the reaction product. Stainless steel chemical polishing can proceed smoothly, depending on the reasonable combination of the above ingredients.
Stainless steel electrolytic polishing is the stainless steel products hanging on the anode, in the electrolytic polishing solution for anodic electrolysis. Electrolytic polishing is a special anodic process. During the whole anodic electrolytic polishing process, the surface of the stainless steel product is carried out simultaneously with two conflicting processes, namely the continuous formation and dissolution of the oxide film on the surface of the metal. However, the surface of the stainless steel products and the concave surface of the chemical film into the passive state is not the same, and because the anode dissolved, the anode area of metal salt concentration continues to increase in the surface of stainless steel products to form a high resistivity thick Mucosal layer. The thickness of the mucous mucosa on the surface of the product is different, and the micro-surface current of the anode is unevenly distributed. Micro-protrusion at the current density, dissolve faster, so that the surface of the product glitches or micro-protrusion at the beginning of the first to dissolve and leveling; depression depression current density is small, the dissolution is also slower. As the current density distribution is different, the product surface at different rates continue to film and dissolved. The anode surface at the same time with two reverse process, film and dissolution, passivation film continue to generate, dissolve, so that the surface of stainless steel products are flattened to achieve a high degree of smooth and shiny appearance, to meet the surface of stainless steel products polished.