The cause with rusty stainless steel reachs place buy way

Stainless steel, interpret without real understanding points to namely be able to bear or endure the air, vapour, water steel that corrodes medium and acid, alkaline, salt to wait for medium of sex of chemical dip corrode to corrode infirmly, say not to become rusty again acid-proof steel. But among the application in practice, some stainless steel however of accident gave birth to rust.

When stainless steel tubal appearance presents Brown rusty spot (dot) time, people feels amazed greatly: Think " stainless steel is rustless, rusting is not stainless steel, the likelihood is steel presented a problem character " . Actually, this is a kind of when lack understanding to stainless steel one-sided erroneous judgment. Stainless steel also can rust below certain condition. Stainless steel is had resist the ability that atmosphere oxidizes---Do not become rusty namely quality, also have the ability that corrodes therefore in the medium that containing acerbity, alkaline, salt at the same time---Be able to bear or endure namely corrode sex. But its fight the size that corrodes ability is chemistry of therewith steel qualitative oneself the composition, condition that add each other, use condition and environmental medium type and those who alter. Be like 304 steel tube, in the air of as dry as a chip cleanness, have fight rustily ability outstandingly absolutely, but move it littoral district, in the sea fog that contains many salt portion, can rust very quickly, and 316 steel tube are behaved good.

Consequently, not be a kind of any stainless steel, fall in any environments can anti-corrosive, rustless. Stainless steel is * its appearance forms a paper-thin and consolidate close stable Fu Ge oxidizes film (defend velar) , avoid oxygen atomic to continue infiltration, continue to oxidize, and obtain fight rustily ability. Once have some kind of reason, this kind of film sufferred be destroyed often, atom of the oxygen in air or liquid is met often often analyse leaves atom of the iron in infiltration or metal come out, form loose ferric oxide, metallic appearance also suffers often rustily.

The kind that this kind of outside film destroys is very much, see more in daily life have a few kinds as follows:

The first, corrode between inherent brilliant.
This kind of material that does not contain titanium and niobium has the tendency that corrodes between brilliant. Attend titanium and niobium, deserve to deal with in order to stabilize again, can decrease corrode between brilliant. Be in air or chemistry is corroded can resist in medium a kind of when corrode tall alloy steel, stainless steel is it is good to have beautiful appearance and corrosion resistance, need not wait for appearance to deal with through plating color, and the outside property that develops solid of stainless steel place to have, apply a steely kind at many sided, call stainless steel normally. Those who represent performance have 13 chromium steel, the tall alloy steel such as 18-8 chrome-nickel steel. Analyse from metallography angle, contain chromium as a result of stainless steel and make appearance makes very thin chromic film, this film lies between the oxygen that invades inside departure and steel to rise anticorrosive action. To hold to the corrosion resistance with stainless steel inherent place, steel is indispensible the chromium that contains 12% above. With the place that solders at demand. Inferior carbolic content makes the carbide that affects separate out of the place in the area in the heat that stands by welding line is decreased to least, and the separate out of carbide may bring about stainless steel arises in certain environment weld corrosion is corroded between brilliant.

The 2nd, without the course solid dissolve deals with.
Alloying element enters matrix without dissolve, cause matrix to organize alloy content low, the performance that fight corrode is poor.

The 3rd, chloric ion exists in applying an environment.
Chloric ion exists generally, example salt / sweat is slash / seawater / sea wind / soil is waited a moment. Stainless steel is put in the environment below in chloric ion, corrode very fast, down to surmounts common mild steel. Be opposite so of stainless steel apply an environment to have a request, and demand often is wiped, eliminate dirt, hold to cleanness as dry as a chip. (Can decide to him so " apply undeserved " . ) the United States has a case: Some enterprise uses one oak container full-dress the solution that some contains chloric ion, this container already applied nearly more than 100 years, last centuries 90 time plan changes, because oak data is insufficient contemporary, because 16 days of container after using stainless steel to change corrode divulge.

The 4th, stainless steel appearance retains the attachment that accumulating the dust that contains other tantalum or alien metal grain, in humid air, the condenser water between attachment and stainless steel, become both a small cell repeatedly, caused electrochemistry echo, safeguard film to be destroyed, those who say call electrochemistry is corroded.

The 5th, conglutinate of stainless steel appearance has machine content juice (the dish that be like melon, water in which noodles have been boiled, phlegmy wait for) , below state of oxygen having water, make organic acid, long an organic acid is outside to the metal corrode.

The 6th, conglutinate of stainless steel appearance contains acerbity, alkaline, salt kind material (if decorate) of splash of the buck of wall, limewater, occasion part corrode.

The 7th, in the air that has pollution (if contain the air of nitrogen of carbon of a large number of sulfide, oxidation, oxidation) , treat condenser water, make point of fluid of vitriolic, nitric acid, acetic acid, occasion chemistry is corroded. Above state all can form stainless steel appearance to defend of film destroy cause rustily.

So: To ensure metallic appearance aeon is shining, not by rustily, the proposal can be done in its appearance clean, passivation deal with.



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