Thaum cov xim av xeb (spots) tshwm rau saum npoo ntawm cov kav hlau stainless, cov neeg xav tsis thoob: "Stainless hlau 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 yuav xeb nyob rau hauv tej yam kev mob.
Stainless hlau muaj peev xwm tiv taus atmospheric oxidation - uas yog, xeb kuj, thiab nws 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 lub peev xwm los tiv thaiv corrosion nws txawv nrog cov tshuaj muaj pes tsawg leeg ntawm nws cov hlau nws tus kheej, lub xeev ntawm kev sib nrig sib ntxiv, cov kev mob ntawm kev siv thiab hom kev tshaj tawm ib puag ncig. Piv txwv li, 304 steel yeeb nkab muaj peev xwm tiv thaiv corrosion zoo heev nyob rau hauv qhov chaw qhuav thiab huv si, tab sis yog tias nws tau txav mus rau thaj tsam ntawm ntug hiav txwv, nws yuav xeb sai sai hauv hiav txwv pos uas muaj ntsev ntau; thiab 316 steel yeeb nkab qhia tau hais tias zoo. Yog li ntawd, nws tsis yog txhua yam ntawm stainless hlau uas tuaj yeem tiv taus corrosion thiab xeb hauv ib puag ncig.
Stainless hlau cia siab rau ib tug heev nyias, ruaj, zoo thiab ruaj khov chromium-nplua nuj oxide zaj duab xis (tiv thaiv zaj duab xis) tsim nyob rau hauv nws nto los tiv thaiv lub nruam infiltration thiab oxidation ntawm oxygen atoms kom tau lub peev xwm los tiv thaiv xeb. Ib zaug vim li cas, cov yeeb yaj kiab no tsis tu ncua, cov pa oxygen atoms hauv huab cua lossis 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 txuas ntxiv corroded. 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. Nyob rau saum npoo ntawm stainless hlau, muaj deposits ntawm hmoov av los yog heterogeneous hlau hais uas muaj lwm yam hlau ntsiab. Nyob rau hauv cov huab cua ntub, cov dej condensed nruab nrab ntawm cov deposits thiab stainless hlau txuas ob mus rau hauv ib tug micro-battery, uas ua rau ib tug electrochemical cov tshuaj tiv thaiv. , tiv thaiv zaj duab xis puas, hu ua electrochemical corrosion.
2. Organic kua txiv (xws li zaub, noodle kua zaub, hnoos qeev, thiab lwm yam) ua raws li cov hlau tsis huv. Nyob rau hauv lub xub ntiag ntawm dej thiab oxygen, organic acids yog tsim, thiab organic acids yuav corrode hlau nto rau lub sij hawm ntev.
3. Qhov saum npoo ntawm stainless hlau adheres rau cov khoom uas muaj acids, alkalis thiab ntsev (xws li alkali dej thiab txiv qaub dej txaws los ntawm cov phab ntsa kho kom zoo nkauj), ua rau lub zos corrosion.
4. Nyob rau hauv cov huab cua tsis zoo (xws li cov huab cua uas muaj ntau cov sulfide, carbon oxide thiab nitrogen oxide), thaum ntsib cov dej condensed, nws yuav ua kua me me ntawm sulfuric acid, nitric acid thiab acetic acid, ua rau cov tshuaj corrosion.
Cov xwm txheej saum toj no tuaj yeem ua rau kev puas tsuaj rau cov yeeb yaj kiab tiv thaiv ntawm cov hlau tsis huv thiab ua rau xeb. Yog li ntawd, txhawm rau xyuas kom meej tias cov hlau nto yog qhov kaj thiab tsis xeb, peb pom zoo:
1. Qhov saum npoo ntawm cov hniav stainless hlau yuav tsum tau muab ntxuav thiab txhuam tsis tu ncua kom tshem tawm cov ntawv txuas thiab tshem tawm cov khoom siv sab nraud uas ua rau kev hloov kho.
2. 316 stainless hlau yuav tsum tau siv nyob rau hauv seaside cheeb tsam, thiab 316 cov khoom yuav tiv taus seawater corrosion.
3. Cov tshuaj muaj pes tsawg leeg ntawm qee cov kav hlau stainless ntawm lub khw tsis tuaj yeem ua tau raws li cov qauv hauv tebchaws thiab tsis tuaj yeem ua tau raws li 304 cov khoom siv. Yog li ntawd, nws tseem yuav ua rau xeb, uas yuav tsum tau ua tib zoo xaiv cov khoom los ntawm cov tuam txhab muaj npe nrov.
