Thaum cov xim av xeb (spots) tshwm rau saum npoo ntawm stainless hlau, tib neeg xav tsis thoob: "Stainless hlau yuav tsis xeb, thiab yog tias nws xeb, nws tsis yog stainless hlau, thiab tej zaum yuav muaj teeb meem nrog cov hlau." Qhov tseeb, qhov no yog ib qho kev xav tsis zoo txog kev tsis nkag siab ntawm stainless hlau. Stainless hlau kuj tuaj yeem xeb nyob rau hauv qee yam mob.
Stainless hlau muaj peev xwm tiv taus atmospheric oxidation, uas yog, xeb kuj, thiab kuj muaj peev xwm tiv thaiv corrosion nyob rau hauv xov xwm uas muaj acids, alkalis, thiab ntsev, uas yog, corrosion kuj. Txawm li cas los xij, qhov loj ntawm nws qhov kev tiv thaiv corrosion yog hloov nrog cov tshuaj lom neeg muaj pes tsawg leeg ntawm cov hlau nws tus kheej, kev sib koom ua ke, kev siv thiab hom kev tshaj tawm ib puag ncig. Piv txwv li, 304 cov khoom muaj qhov zoo heev corrosion kuj nyob rau hauv qhov chaw qhuav thiab huv si, tab sis yog tias nws tau tsiv mus rau thaj chaw ntug dej hiav txwv, nws yuav xeb sai sai hauv hiav txwv pos uas muaj ntsev ntau. Yog li ntawd, tsis yog txhua hom stainless hlau tuaj yeem tiv taus corrosion thiab xeb txhua lub sijhawm.
Stainless hlau yog nyias nyias, ruaj, zoo thiab ruaj khov chromium-nplua nuj oxide zaj duab xis (tiv thaiv zaj duab xis) tsim rau ntawm nws qhov chaw los tiv thaiv cov pa atoms los ntawm kev nkag mus thiab txuas ntxiv mus rau oxidize kom tau txais kev tiv thaiv corrosion. Thaum cov yeeb yaj kiab raug puas tsuaj tsis tu ncua vim qee yam, cov pa oxygen atoms hauv huab cua lossis cov kua yuav nkag mus ntxiv lossis cov hlau atoms hauv cov hlau yuav txuas ntxiv sib cais, tsim cov hlau oxide xoob, thiab cov hlau saum npoo yuav raug cuam tshuam los ntawm xeb. . Muaj ntau hom kev puas tsuaj rau zaj duab xis saum npoo, feem ntau hauv lub neej niaj hnub yog cov hauv qab no:
1. Lub nto ntawm stainless hlau accumulates plua plav uas muaj lwm yam hlau ntsiab lus los yog cov attachments ntawm dissimilar hlau hais. Nyob rau hauv huab cua ntub, cov dej condensed nruab nrab ntawm cov ntawv txuas thiab cov hlau tsis muaj hlau txuas ob mus rau hauv cov roj teeb micro, uas ua rau cov tshuaj tiv thaiv electrochemical. , tiv thaiv zaj duab xis puas, hu ua electrochemical corrosion.
2. Qhov saum npoo ntawm stainless hlau adheres rau organic kua txiv (xws li zaub, noodle kua zaub, hnoos qeev, thiab lwm yam), uas tsim cov organic acids nyob rau hauv lub xub ntiag ntawm dej thiab oxygen, thiab tsim organic acids corrode hlau nto rau lub sij hawm ntev. .
3. Qhov saum npoo ntawm stainless hlau adheres rau cov khoom uas muaj cov kua qaub, alkalis thiab ntsev (xws li dej alkali thiab txiv qaub dej txau rau kev kho kom zoo nkauj ntawm phab ntsa), ua rau lub zos corrosion.
4. Nyob rau hauv cov huab cua tsis zoo (cov huab cua uas muaj ntau ntawm sulfides, oxides, thiab hydrogen oxide), nyob rau hauv lub xub ntiag ntawm condensed dej, nws yuav ua kua me me ntawm sulfuric acid, nitric acid, thiab acetic acid, ua rau cov tshuaj corrosion.