Corrosion resistance of stainless steel depends on chromium, but because chromium is an integral part of the steel, so protection methods vary. The addition amount of chromium 10.5%, the atmospheric corrosion resistance of steel significantly increased, higher chromium content, while still being improved corrosion resistance, but not obvious. The reason is of steel with a chromium alloying treatment, the change in the type of surface oxide became similar to pure chromium metal oxide formed on the surface. This tight adhesion of chromium-rich oxide protective surface to prevent further oxidation. This thin oxide layer, through which you can see the surface of the natural luster of steel, the stainless steel has a unique surface. Moreover, if the surface is damaged, the exposed steel surface and atmospheric reactions will self repair, re-formation of this kind of "passive film" and continue to play a protective role. Therefore, all of the stainless steel have a common characteristic, that chromium content of 10.5% or more. And building construction applications usually only about six kinds of steel. They contain 17 to 22% chromium, preferably of steel also contains nickel. Add molybdenum can be further improved atmospheric corrosion resistance, especially resistance to chloride-containing atmospheric corrosion.
Thursday, August 15, 2013
Corrosion resistance of stainless steel
All metals and reaction of oxygen in the atmosphere, the surface oxide film. Unfortunately, in the iron oxide formed on carbon steel proceed oxidation, corrosion continues to expand, forming holes. You can use paint or oxidation-resistant metal (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.
Corrosion resistance of stainless steel depends on chromium, but because chromium is an integral part of the steel, so protection methods vary. The addition amount of chromium 10.5%, the atmospheric corrosion resistance of steel significantly increased, higher chromium content, while still being improved corrosion resistance, but not obvious. The reason is of steel with a chromium alloying treatment, the change in the type of surface oxide became similar to pure chromium metal oxide formed on the surface. This tight adhesion of chromium-rich oxide protective surface to prevent further oxidation. This thin oxide layer, through which you can see the surface of the natural luster of steel, the stainless steel has a unique surface. Moreover, if the surface is damaged, the exposed steel surface and atmospheric reactions will self repair, re-formation of this kind of "passive film" and continue to play a protective role. Therefore, all of the stainless steel have a common characteristic, that chromium content of 10.5% or more. And building construction applications usually only about six kinds of steel. They contain 17 to 22% chromium, preferably of steel also contains nickel. Add molybdenum can be further improved atmospheric corrosion resistance, especially resistance to chloride-containing atmospheric corrosion.
Corrosion resistance of stainless steel depends on chromium, but because chromium is an integral part of the steel, so protection methods vary. The addition amount of chromium 10.5%, the atmospheric corrosion resistance of steel significantly increased, higher chromium content, while still being improved corrosion resistance, but not obvious. The reason is of steel with a chromium alloying treatment, the change in the type of surface oxide became similar to pure chromium metal oxide formed on the surface. This tight adhesion of chromium-rich oxide protective surface to prevent further oxidation. This thin oxide layer, through which you can see the surface of the natural luster of steel, the stainless steel has a unique surface. Moreover, if the surface is damaged, the exposed steel surface and atmospheric reactions will self repair, re-formation of this kind of "passive film" and continue to play a protective role. Therefore, all of the stainless steel have a common characteristic, that chromium content of 10.5% or more. And building construction applications usually only about six kinds of steel. They contain 17 to 22% chromium, preferably of steel also contains nickel. Add molybdenum can be further improved atmospheric corrosion resistance, especially resistance to chloride-containing atmospheric corrosion.
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