Stainless steel why anti-corrosive?

All metals undertake echo with the oxygen in atmosphere, outer watch makes oxidation film. Unfortunate is, the ferric oxide proceed that forms on general carbon steel oxidizes, make rustily and ceaseless expand, make hole after all. Can use paint or be able to bear or endure the metal of oxidation (for example, zinc, nickel and chromium) undertake eletroplating will ensure carbolic steel is outside, but, no less than everybody knows in that way, this kind is safeguarded is a kind of film only. If safeguard a layer to be damaged, the steel below begins rustily.
The corrosion resistance of stainless steel depends on chromic, because chromium is one of component of steel,can be, defend measure so endless and identical.
In chromic accretion the quantity arrives 10. When 5 ％ , of steel be able to bear or endure function of atmospheric corrosion t is being shown add, when Dan Ge content is higher, although still can progress corrosion resistance, but showing. The reason is when undertaking to steel with chromium alloy changes processing, alter the type of outside oxide into be similar to the outside oxide that forms on pure chromic metal. The rich chromic oxide of this kind of close conglutinate maintains appearance, prevent further combustion. Layer of this kind of oxidation is paper-thin, pass through it to be able to see the natural burnish of steel appearance, make stainless steel has distinctive appearance. And, if damaged surface layer, what expose exposed steel appearance meeting and atmosphere echo undertake ego is repaired, form " of film of passivation of this kind of " from the beginning, continue to safeguard the effect. Consequently, all stainless steel has a kind of character, namely chromic content all is in 10. 5 ％ above.

The type of stainless steel
"One word of stainless steel " is pure not just point to a kind of stainless steel, indicate however stainless steel of more than 100 kinds of industry, every kinds of develops stainless steel applies a domain specificly to have crackajack function in its. Successful key is to should clarify good above all, conclude accurate steel is planted again next. The further detailed case of concerned stainless steel can pay a formal visit the floppy disk of " of strategy of " stainless steel that weaves by NiDI.
Luckily and the steel that erect construction application domain to concern are planted want 6 kinds only normally. They contain a lot ofthe chromium of 22 ％ of 17 ～ , better steel is planted still contain a lot ofnickel. Add molybdenum to be able to improve sex of atmospheric corrosion t further, be able to bear or endure especially contain chloride atmospheric to corrode.
Be able to bear or endure experience of atmospheric corrosion t indicates, atmospheric corrodes degree because of district different. Clarify to facilitate, the view shares out bonus district 4 kinds, namely: Village, city, industrial district and foreland.
The village is basically the area of free from contamination. Density of this area population is low, want the industry of free from contamination only.
The city is a model live, commerce and light industry area, have inside this area spend pollution gently, for example traffic pollution.

The industrial district makes the region of air pollution for heavy industry. Polluting a likelihood is the gas that makes as a result of fuel place, for example the oxide of sulfur and nitrogen, or the other gas that chemical plant or processing factory release. The grain that air horizontally pivoted hung swims, the accumulation of the dust that in producing a course like iron and steel, produces or ferric oxide also is met corrode is added.

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