Generally speaking, metals that are easy to ionize are easy to be oxidized, that is, easy to corrode, but in fact this is not completely the case. Although some metals such as aluminum, magnesium, and chromium are easy to ionize, they are easy to be ionized in the atmosphere or water. A film of corrosion products is formed, thereby improving corrosion resistance. The surface state of aluminum and aluminum alloys is changed by chemical or electrochemical methods, so that the dissolution rate is sharply reduced, and the corrosion resistance is improved. This process is called aluminum passivation treatment. Passivation is often accompanied by a sudden increase in anodic potential, which makes it difficult for anodic reactions to proceed and slows or stops metal corrosion. Passivation actually turns the active metal surface into an inert surface through the chemical reaction of the passivation solution, thereby preventing external destructive substances from reacting with the metal surface, thereby achieving the purpose of prolonging the rusting time. Because passivation can significantly improve the corrosion resistance of metal, it is widely used in machinery, electronics, instruments, daily necessities, military equipment and other fields. In recent years, with the continuous development of productivity. Stainless steel materials have been rapidly and widely used in various industrial fields. According to relevant statistics, my country's demand for stainless steel materials increased from 260,000 tons in 1990 to about 5.6 million tons in 2006. A year-on-year increase of about 22 times. This trend is developing and has been continuously rising. The market for the application of stainless steel materials can be imagined, large and small metal products companies can be said to be all over the world. However, the expensive price of stainless steel also limits its application.
Especially in recent years, the rising price of raw materials has seriously affected the production cost of stainless steel products and has become a bottleneck restricting the development of production. Under the pressure of competition and the need for cost reduction, various enterprises have now invested in the research and development and production of 400 series and 200 series products; 400 series and 200 series are low-chromium and low-nickel stainless steels. The knowledge cost of 304 stainless steel square tube is relatively low and only less than 1/2 of that of 300 series stainless steel. Therefore, it is deeply loved by the majority of users, and the market demand for such materials is also increasing. From this analysis, it will become an inevitable trend in the application of stainless steel materials in the future. However, although these materials have mechanical properties equivalent to 300 series stainless steels, they are ultimately less resistant to corrosion due to too low chromium and nickel content. Therefore, how to improve the corrosion resistance of such materials is the key to the effective application of materials.
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