Why can stainless steel also rust?

Why can stainless steel also rust?


When stainless steel surface extensive has Brown rusty spot (dot) when, surprised and bewildered of people big move: Think “ stainless steel won't be rusty, rusting is not stainless steel, the likelihood is steel gave thematic ” character. Honest, this is a kind of when lack understanding to stainless steel one-sided wrong view. Stainless steel also can rust below certain premise.
Stainless steel has the capability that checks atmosphere oxidation not to become rusty namely quality, erodent ability is able to bear or endure namely in also having the medium that containing acerbity, alkaline, salt at the same time aggressivity. But its fight the size that erodes ability is composition of chemistry of therewith steel qualitative itself, mutual condition, use premise reachs environmental medium kind and change. Be like 304 material, in the air of dry cleanness, have fight admirably absolutely erode ability, but move it littoral area, in the sea fog that contains a large number of salinity, can rust very quickly. Accordingly, not be a kind of any stainless steel, in any moment ability is eroded, rustless.
Stainless steel is to rely on its surface to form a paper-thin and film of solid and close not random Fu Ge oxidation (defend film) , prevent oxygen atom to accede permeate, successive oxidation, and obtain fight erodent ability. One but have some kind of reason, this kind of film suffers ceaseless destruction, air or liquid counteract oxygen atom can be permeated ceaselessly or the iron in the metal is atomic ceaselessly analyse leaves come out, form inattentive ferric oxide, metallic surface also gets ceaseless rustily. The formal fine that film of this kind of surface is destroyed is much, paper what see more in the mouth to have a few kinds as follows daily:
1, the dust that stainless steel surface collects the saving to contain other tantalum or alien metal the attachment of makings, be in wet
In air, the condenser water between attachment and stainless steel, become both a small cell repeatedly, caused electrochemistry to turn over
Should, diaphragm is destroyed, say call electrochemistry is eroded.
2, stainless steel surface sticks juice of adherent and organic matter (if melon dish, water in which noodles have been boiled is phlegmy,wait) , below circumstance of oxygen having water, form
Organic acid, form organic acid for long to be opposite of metallic surface erode.
3, conglutinate of stainless steel surface contains acerbity, alkaline, salt kind material (if decorate the buck of wall, limewater gush,measure) cause
Local erode.
4, in the air that has pollution (the air that contains hydrogen of many sulfide, oxide, oxidation) , treat condenser water,
Form place of fluid of vitriolic, nitric acid, acetic acid, cause chemistry to erode.
Above circumstance all can cause stainless steel surface to defend velar destruction, cause erode. So, to ensure metallic surface is permanent and shining, be not rusted, we suggest:
① is indispensible often undertake to decorating stainless steel surface cleanness is swabbed, purify attachment, eliminate cause rustily outside element.
② has a kind of 201 stainless steel that reach 202 material to pledge to become rusty in littoral area Yi Sheng on the market now, be in worthily without the industry pollution and air erode an environment next use.
③ seaside area should use 304 material qualitative stainless steel, 304 material can keep out seawater to erode character.
6, one but how should be the rusty spot since stainless steel extensive handled?
A) chemical method:
Cream with pickling or sparge assists his new passivation forms rustily place oxidation chromic film makes its restore to be able to bear or endure afresh erode
Ability, after pickling, for purify all contaminant are mixed acerbity hangover, it is very important to undertake eroding appropriately with clean water. Polishing device is used after everything is handled new polish, use polishing dried meat to block can. Ministry of play a game of chess has a little of rusty spot usable also 1: Mixed liquor of the benzine of 1, engine oil obliterates with clean dishcloth rusty spot can.
B) mechanical method:
Gush is arenaceous clear, with glass or particle of pottery and porcelain gush bolus clears, annihilation, wash brush and polishing. Have with mechanical method but
The pollution that can obliterate to be caused by cleared material, polishing material or annihilation material before. All all sorts of pollution especially grain of ab extra iron becomes erodent source possibly, it is especially in wet environment. Accordingly, machinery clears the surface is best ought to undertake clearing normally below dry premise. Use machinery law can clear only its surface, of unalterable material itself fight erode ability. Because this suggests to use polishing device after machinery clears new polish, use block of polishing dried meat.



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