Thaum cov xim xim av xeb (spots) tshwm rau ntawm cov kav dej stainless hlau, qee cov neeg ntseeg tias "stainless steel tsis xeb, xeb tsis yog stainless hlau, nws yuav muaj teeb meem nrog cov hlau zoo." Qhov tseeb, qee cov ntaub ntawv uas tsis tshua muaj npib tsib xee hauv cov hlau tsis xeb yog xeb, yog li cov xeb kuj tseem tuaj yeem yog cov hlau tsis muaj steel. Niaj hnub no, stainless hlau kav yog dav siv. Stainless hlau kuj tuaj yeem xeb hauv qee yam mob.
Stainless hlau muaj peev xwm tiv taus atmospheric oxidation, xws li xeb kuj, thiab kuj muaj peev xwm tiv thaiv corrosion hauv xov xwm uas muaj kua qaub, alkali, thiab ntsev, uas yog corrosion kuj. Tab sis qhov loj ntawm nws cov corrosion kuj txawv nrog cov tshuaj muaj pes tsawg leeg, lub xeev additive, kev siv, thiab hom ntawm ib puag ncig nruab nrab ntawm cov hlau nws tus kheej. Piv txwv li, 304 cov kav hlau steel muaj cov xeb zoo heev nyob rau hauv qhov chaw qhuav thiab huv si, tab sis thaum tsiv mus rau thaj chaw ntug dej hiav txwv, lawv yuav xeb sai sai hauv hiav txwv huab cua uas muaj cov ntsev ntau. Yog li ntawd, tsis yog txhua hom stainless hlau tuaj yeem tiv taus corrosion thiab xeb hauv ib puag ncig.
Stainless hlau yog ib qho ruaj khov chromium nplua nuj oxide zaj duab xis (tiv thaiv zaj duab xis) tsim rau ntawm nws qhov chaw, uas yog nyias nyias, ruaj khov, thiab zoo, tiv thaiv kev nkag mus ntxiv thiab oxidation ntawm oxygen atoms, thiab tau txais lub peev xwm los tiv thaiv corrosion. Ib zaug yog vim li cas, cov yeeb yaj kiab nyias no tau raug puas tsuaj tas li, thiab cov pa oxygen atoms hauv huab cua lossis kua yuav tsis tu ncua infiltrate lossis hlau atoms hauv cov hlau yuav tsis tu ncua sib cais, tsim cov hlau oxide xoob, thiab cov hlau saum npoo yuav raug corroded tas li. Cov ntsej muag ntsej muag zoo li no tau raug puas tsuaj rau ntau txoj hauv kev, thiab cov hauv qab no muaj ntau yam hauv lub neej txhua hnub:
1. Cov plua plav uas muaj lwm yam hlau los yog cov khoom sib txuas ntawm cov hlau tsis sib xws hauv cov hlau tsis zoo. Nyob rau hauv cov huab cua ntub, qhov txuas thiab cov condensate ntawm qhov txuas thiab stainless hlau tsim ib lub roj teeb micro, ua rau cov tshuaj tiv thaiv electrochemical thiab ua rau cov yeeb yaj kiab tiv thaiv, uas yog hu ua electrochemical corrosion.
2. Qhov saum npoo ntawm stainless hlau adheres rau organic kua txiv (xws li melons, zaub, noodle kua zaub, phlegm, thiab lwm yam), uas tsim cov organic acids nyob rau hauv lub xub ntiag ntawm dej thiab oxygen. Thaum lub sij hawm, cov organic acids corrode hlau nto.
3. Qhov saum npoo ntawm stainless hlau adheres rau cov khoom uas muaj acids, alkalis, thiab ntsev (xws li alkaline dej thiab txiv qaub dej splashing thaum lub sij hawm kho kom zoo nkauj phab ntsa), ua rau lub zos corrosion.
4. Nyob rau hauv cov huab cua tsis zoo (xws li cov huab cua uas muaj ntau cov sulfides, carbon oxides, thiab nitrogen oxides), thaum ntsib condensation dej, sulfuric acid, nitric acid, thiab acetic acid droplets tsim, ua rau cov tshuaj corrosion.
Cov xwm txheej saum toj no tuaj yeem ua rau muaj kev puas tsuaj rau qhov chaw tiv thaiv zaj duab xis ntawm stainless hlau tshuaj twj, ua rau corrosion. Yog li, txhawm rau xyuas kom meej tias cov hlau nto yog qhov ci ntsa iab thiab tsis corroded, peb pom zoo:
1. Nws yog ib qho tsim nyog yuav tsum tsis tu ncua ntxuav thiab txhuam qhov saum npoo ntawm cov hniav stainless hlau tshuaj twj tso kua mis kom tshem tawm cov ntawv txuas thiab tshem tawm lwm yam uas yuav ua rau kev hloov kho.
2. Nyob rau hauv ntug dej hiav txwv, 316 stainless hlau pipeline twj yuav tsum tau siv, uas yuav tiv taus seawater corrosion.
3. Qee cov kav hlau stainless hauv kev ua lag luam tsis ua raws li lub teb chaws tus qauv rau cov tshuaj muaj pes tsawg leeg thiab tsis tuaj yeem ua tau raws li cov khoom siv 304. Yog li ntawd, nws kuj tuaj yeem ua rau xeb, uas yuav tsum tau ua tib zoo xaiv cov khoom los ntawm cov tuam txhab muaj npe nrov.
