Muaj ntau ntau hom hlau stainless, xws li ferritic steel hlau, rorderitic stainless hlau, nag lossis lwm yam, raws li muaj nyob hauv daim duab hauv qab no.
Qhov laj thawj yog vim li cas stainless hlau yuav tsis muaj txiaj ntsig yog qhov tseem ceeb yog tias nws tsis muaj tsawg dua 12%, uas tuaj yeem pom los ntawm daim duab saum toj no. Lub chromium ntawm lub saum npoo reacts nrog oxygen nyob rau hauv cov huab cua los ua ib qho chromium oxide (cr₂o₃) passivation zaj duab xis. Qhov kev ua yeeb yaj kiab passivation no yog heev nyias tab sis ntom, uas tuaj yeem cais cov hlau los ntawm sab nraud thiab tiv thaiv kev tiv thaiv cov hlau, yog li tiv thaiv cov hlau los ntawm corrosion.
Txawm hais tias saum npoo ntawm stainless hlau yog mechanically eroded los yog chromium oxide passivation zaj duab xis tuaj yeem kho tus kheej - kho. Ntev npaum li muaj cov pa oxygen txaus, cov chromium lub caij nyob rau saum npoo ntawm cov hlau tsis muaj paab tuaj yeem kho nrog cov pa oxygen, thiab kho nws cov nyhuv tiv thaiv.
Nyob rau hauv kev tiv thaiv ntawm chromium oxide passivation zaj duab xis, Stainless hlau tuaj yeem tiv thaiv cov yaig ntawm feem ntau corrosive media xws li acids, alkalis, thiab ntsev. Txawm li cas los xij, hauv kev coj ua tiag tiag, tib neeg tseem qee zaum pom cov kav hlau hlau tsis muaj xeb, raws li pom hauv daim duab hauv qab no. Dab tsi yog mus?
1. Qhov zoo ntawm stainless hlau tsis tsim nyog thiab cov khoom muaj pes tsawg leeg tsis tau raws li qhov yuav tsum tau ua. Piv txwv li, cov ntsiab lus chromium chromium tsawg dua 12%, lossis cov ntsiab lus ntawm Nickel thiab Molybdenum tsis txaus, uas tsis tuaj yeem ua si zoo anti- av xeb.
2. Siv nyob rau hauv ib puag ncig muaj halogen ions (cl ⁻, xws li lwm yam kev ua yeeb yaj kiab, ua cov pits corrosion thiab loj hlob hauv qhov tob.
3. Tus hlau stainless yog cuam tshuam los ntawm kev kub siab thiab intergranular corrosion tshwm sim. Thaum stainless hlau yog rhuab ntawm 427 ~ 816 degree, kev kho mob chromium (Cromrium carretion nyob ze cov ciaj ciam (cov ntsiab lus<12%), thereby losing the ability to form a passivation film.
4. Kev ntxhov siab tawg corrosion. Thaum stainless hlau yog raug rau tensile kev ntxhov siab, yog tias cov khoom nyob rau hauv cov thib ob thiab ua kom nrawm rau kev hais tawm raws cov qoob loo ntawm cov nplej.
5. Cov saum npoo muaj paug lossis puas. Piv txwv li, thaum cov cuab yeej siv roj carbon steel tuaj rau hauv kev sib chwv cov khoom sib chwv, cov khoom lag luam hlau tuaj yeem ua rau Galvanic corrosion vim muaj peev xwm sib txawv ntawm cov hlau. Khawb, vuam spatter, thiab lwm yam tuaj yeem puas cov zaj duab xis pass, ua rau corrosion pib cov ntsiab lus los ua ntej zaj duab xis passivation yog tsim. Roj stains nyob rau saum npoo ntawm stainless hlau yuav cuam tshuam rau kev tsim ntawm passive zaj duab xis. Hmoov av thiab impurities tuaj yeem nqus noo noo thiab cov tshuaj corrosive, yog li nrawm nrawm hauv zos corrosion.(来源: Imchanics 机械)
