Advantages and disadvantages of surface treatment process for stainless steel pipelines
In order to enhance the surface quality of stainless steel pipelines, optimization of the surface morphology and application of structure, reduce the energy level and the number of dielectric layers, need to do some processing on stainless steel pipeline system, mainly divided into mechanical drawing, mechanical grinding, polishing, pickling and passivation, feather cloth light burning blunt, sub electrochemical polishing and electrochemical polishing.
Mechanical drawing is used to increase the roughness of the surface by the plug of the plug. It can improve the surface structure of the stainless steel pipeline, but it will not optimize the other aspects. This is the most basic surface treatment process, and the roughness of this method also lays a good foundation for further surface treatment process.
Mechanical grinding is the use of precision grinding method to increase the surface roughness, which can optimize the surface structure, but will not improve the shape and other aspects.
Fabric decoration is polished stainless steel industry commonly used to increase the brightness of the surface of the way, although this process Ra value is good, but in the electron microscope can still see a lot of cracks, the actual surface area becomes larger, the local will be separated from the ferrite and martensite structure. The surface of the pipeline is mixed with a lot of impurities, such as abrasive particles. Because the use of the polishing paste, a lot of energy will be in the original formation of the depression, leading to the increase in the number of media. Such pipelines are often not used in sensitive corrosive media, such as optoelectronics and biopharmaceuticals.
After pickling or passivation, stainless steel pipelines will not enhance the surface roughness of the material, but it can remove the residual abrasive particles and reduce the energy level, but it can not reduce the number of interlayers.
The light burning passivation process refers to the hydrogenation or vacuum condition of stainless steel pipeline by high temperature heat treatment, so as to eliminate the internal stress, but also generate a passivation film on the surface of the pipelineline, which can optimize the structure and reduce the energy level, but does not increase the surface roughness.
Asia is a kind of electrochemical polishing a surface treatment based on BA stainless steel plate, which is a slight electrolytic polishing process, to try to reduce the surface area, thick passivation film, thereby increasing the corrosion resistance and improve surface morphology, reduce the energy level. After such surface treatment, the stainless steel pipeline is not very high in brightness, but the surface quality is greatly improved, and it will not form particles and reduce the composition of iron and iron oxide on the surface.
Electrochemical polishing process is achieved by electrochemical polishing, which can greatly increase the surface morphology and structure, and minimize the actual surface area of stainless steel pipelines. The surface of the pipeline is a closed, very thick chrome oxide film. The energy is close to the normal level of the stainless steel alloy, and the quantity of the medium will be reduced to a minimum.