Which is more corrosion resistant, stainless steel electrolytic polishing or passivation? Hengda model in the process of receiving customers will often be asked this question, let us first understand the stainless steel passivation and electrolytic polishing what is the difference?
Which is more corrosion resistant, stainless steel electrolytic polishing or passivation? Hengda model in the process of receiving customers will often be asked this question, let us first understand the stainless steel passivation and electrolytic polishing what is the difference?
Passivation is a phenomenon that the chemical activity of active metal or alloy is greatly reduced, and the chemical stability is obviously enhanced to become a noble metal state. The metal passivation phenomenon caused by some passivating agents (chemicals) is called chemical passivation. After metal passivation, its electrode potential moves in the positive direction, making it lose its original characteristics, such as passivated iron in the copper salt can not be replaced out of copper. In addition, the metal can be passivated by electrochemical methods. The phenomenon of metal passivation caused by anodic polarization is called anodic passivation or electrochemical passivation. If the corrosion product of the metal due to the action of the medium has a dense structure, forming a thin film (often invisible) , tightly covering the surface of the metal, this film is called Passivation film.
Passivation process is usually the metal in nitrite, nitrate, epiphyte or re-epiphyte solution treatment, so that the metal surface formed a passivation film process. It is often used as a post-treatment of zinc and cadmium coatings to improve the corrosion resistance of the coatings, protect the Non-ferrous metal and improve the adhesion of the coatings.
Electrolytic polishing is a process in which the workpiece is treated as an anode and the insoluble metal as a cathode. The two electrodes are immersed in the cell at the same time, and the selective anodic dissolution is produced by direct current ionization reaction, thus, the effect of removing fine burr and increasing brightness on the surface of the workpiece can be achieved, and the corrosion resistance of stainless steel is greatly improved.
From the above description, passivation and electrolytic polishing can improve the corrosion resistance of stainless steel, through the Hengda model of 304 stainless steel parts passivation and electrolytic polishing of salt spray test, passivation of stainless steel is often more corrosion resistant than electrolytic polishing of stainless steel, passivation and electrolytic polishing of the two processes can even be used together, the only thing to note is the need to first pickling passivation before stainless steel electrolytic polishing. This can make the workpiece to hundreds of hours or even thousands of hours of salt spray time.
Passivation is a phenomenon that the chemical activity of active metal or alloy is greatly reduced, and the chemical stability is obviously enhanced to become a noble metal state. The metal passivation phenomenon caused by some passivating agents (chemicals) is called chemical passivation. After metal passivation, its electrode potential moves in the positive direction, making it lose its original characteristics, such as passivated iron in the copper salt can not be replaced out of copper. In addition, the metal can be passivated by electrochemical methods. The phenomenon of metal passivation caused by anodic polarization is called anodic passivation or electrochemical passivation. If the corrosion product of the metal due to the action of the medium has a dense structure, forming a thin film (often invisible) , tightly covering the surface of the metal, this film is called Passivation film.
Passivation process is usually the metal in nitrite, nitrate, epiphyte or re-epiphyte solution treatment, so that the metal surface formed a passivation film process. It is often used as a post-treatment of zinc and cadmium coatings to improve the corrosion resistance of the coatings, protect the Non-ferrous metal and improve the adhesion of the coatings.
Electrolytic polishing is a process in which the workpiece is treated as an anode and the insoluble metal as a cathode. The two electrodes are immersed in the cell at the same time, and the selective anodic dissolution is produced by direct current ionization reaction, thus, the effect of removing fine burr and increasing brightness on the surface of the workpiece can be achieved, and the corrosion resistance of stainless steel is greatly improved.
From the above description, passivation and electrolytic polishing can improve the corrosion resistance of stainless steel, through the Hengda model of 304 stainless steel parts passivation and electrolytic polishing of salt spray test, passivation of stainless steel is often more corrosion resistant than electrolytic polishing of stainless steel, passivation and electrolytic polishing of the two processes can even be used together, the only thing to note is the need to first pickling passivation before stainless steel electrolytic polishing. This can make the workpiece to hundreds of hours or even thousands of hours of salt spray time.
