Stainless steel is widely used in various fields of modern society due to its superior corrosion resistance. However, in many corrosive environmental media, the corrosion of stainless steel still occurs frequently, especially the local corrosion which is harmful to the damage. In-depth study of the corrosion resistance mechanism of stainless steel, the new stainless steel material and surface modification for guiding the development of ultra-high corrosion resistance New technologies are important. The formation, cracking and pitting of stainless steel surface passivation films involves the transport of electrons and ions. The charge transfer occurs under the electric field drive, and the electric field is affected by the electronic structure of the passivation film. Therefore, the passivation film corrosion resistance is closely related to its semiconductor electronic properties. Studies have shown that the corrosion resistance of stainless steel depends largely on the composition, structure and thickness of its surface passivation film. Many advanced surface treatment technologies such as ion beam, electron beam, laser beam and other physics have been developed. Technology, the stainless steel passivation film is modified to try to improve the corrosion resistance of stainless steel. Lin Changjian and others proposed an electrochemical surface treatment technology that can greatly improve the corrosion resistance of stainless steel, and initially explained the reason why the stainless steel modified passivation film has excellent corrosion resistance. In this paper, we focus on the application of polarization curves, AC impedance and capacitance measurement electrochemical methods to study the corrosion resistance mechanism of electrochemically modified stainless steel passivation film, and try to find out the ultra-high resistance of modified stainless steel passivation film from the semiconductor characteristics of passivation film. The relationship between the etch and the electronic properties further clarifies the essential cause of the high corrosion resistance of the modified passivation film.
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