Corrosion of the stainless steel plate 430

All metals and oxygen in the reaction atmosphere, an oxide film is formed on the surface. Unfortunately, the iron oxide formed on carbon steel is continued oxidation, rust expanded, forming holes. You can use paint or oxidation-resistant metals (eg, zinc, nickel and chromium) plating to ensure the steel surface, but, as people know, this protection is only a film. If the protective layer is damaged, the following steel began to rust. 430 stainless steel sheets corrosion resistance depends on chromium, but because chromium is an integral stainless steel sheets of steel, so the protection methods vary. When you add the amount of chromium reached 10.5%, atmospheric corrosion resistant steel increased significantly, but higher chromium content, although still improve corrosion resistance, but not obvious. The reason is that when the steel with a chromium alloying treatment, the type of change has become similar to the surface oxide formed on the surface of magnetism stainless steel chromium oxide of the metal. Chromium-rich oxide protects the surface of this tightly adherent to prevent further oxidation. This oxide layer is very thin, it can be seen through the surface of the natural sheen of steel, so stainless steel has a unique surface. Moreover, if the damaged surface, and atmospheric reactions exposed steel surface will self-repair, re-formation of this "passive film", continue to play a protective role. Therefore, all of the stainless steel have a common characteristic, i.e., the chromium content of more than 10.5%.