Stainless Hlau Corrosion Resistance Txoj Cai Thiab Kev Xaiv
Tso lus
Lub hauv paus ntsiab lus ntawm corrosion kuj ntawm stainless hlau
Cov pa roj carbon zoo tib yam thiab cov pa oxygen hauv cov huab cua tsim cov oxide zaj duab xis ntawm cov hlau nto, thiab tom qab ntawd txuas ntxiv mus rau oxidize, ua rau cov xeb txuas ntxiv mus ntxiv thiab tsim ib qho "txhiab-feu ncuav mog qab zib"-style corrosion khoom kom txog thaum nws hnav tawm. Lub stainless hlau stainless yog txuam nrog cov ntsiab lus chromium hauv cov hlau. Thaum cov ntsiab lus chromium nyob rau hauv cov hlau nce mus txog 12%, nws los rau hauv kev sib cuag nrog cov cua thiab tsim ib tug passivation zaj duab xis (Cr2O3) nyob rau saum npoo ntawm stainless hlau. Nws yog ib tug ntom chromium-nplua nuj oxide, uas zoo tiv thaiv stainless hlau nto, tshwj xeeb tshaj yog los ntawm ntxiv re-oxidation. Cov oxide zaj duab xis no yog nyias nyias (tsuas yog ob peb microns), thiab lub ntuj ci ntawm cov hlau tuaj yeem pom los ntawm nws. Nws yog qhov tshwj xeeb nto ntawm stainless hlau. Yog hais tias lub nto passivation zaj duab xis yog ib zaug puas lawm, cov chromium nyob rau hauv cov hlau thiab cov pa oxygen nyob rau hauv cov huab cua yuav regenerate cov passivation zaj duab xis thiab txuas ntxiv mus ua lub luag hauj lwm tiv thaiv.
Qee qhov kev txhim kho hauv zos kuj tseem tuaj yeem tshwm sim hauv qhov chaw tshwj xeeb uas tau ntsib los ntawm cov hlau tsis muaj steel, xws li pitting corrosion (pitting corrosion), intergranular corrosion, kev nyuaj siab corrosion, galvanic corrosion, thiab lwm yam. Kom kov yeej cov corrosions, molybdenum, nitrogen, thiab titanium ntxiv rau lub steel raws. , los yog niobium thiab lwm yam ntsiab lus, thiab ntau yam tshiab xws li cov pa roj carbon tsawg, ultra-low carbon, thiab duplex stainless hlau tau tsim los txhim kho corrosion kuj ntawm stainless hlau.
Txheej txheem cej luam ntawm kev xaiv stainless hlau: Nws yuav tsum muaj kev tiv thaiv corrosion txaus thaum nws lub neej ua haujlwm yam tsis tas siv cov hlau ntau dhau. Thaum tsis tas yuav muaj kev tiv thaiv corrosion zoo heev, tus nqi qis dua hom 201 (1Cr17Mn6Ni5N), Hom 430 (1Cr17) yog qhov tsim nyog tshaj plaws corrosion kuj qib. Txawm hais tias nws qhov kev tiv thaiv corrosion qis dua li ntawm 304 steel, nws qhov kev tiv thaiv corrosion yog txaus kom ua tau raws li cov kev xav tau ntawm cov khoom noj, dej tshiab thiab cov chaw tsis muaj dej hiav txwv. Rau cov ntawv thov uas yuav tsum tau tsuas yog tsis tshua muaj corrosion kuj, hom 405 stainless hlau (0Cr13Al) tuaj yeem raug xaiv, uas yog resistant rau xab npum, cawv, roj crude, roj av thiab lwm yam tsis muaj zog corrosive ib puag ncig. Piv txwv li, stainless hlau dej tso tsheb hlau luam tau siv dav hauv cov dej thiab cov dej hauv kev tsim kho. Yav dhau los, austenitic stainless hlau (304 lossis 316) feem ntau siv. Tom qab ntawd, cov chaw tsim khoom siv ferritic stainless hlau (444), uas yog pheej yig, zoo, thiab zoo heev hauv chloride ion TV.
Ntawd yog: qhov kev xaiv ntawm cov ntaub ntawv nyob ntawm qhov kev thov tshwj xeeb. Ntau cov ntaub ntawv zoo tab sis tsis tsim nyog thiab yuav ua rau cov nqi ntxiv. Xaiv cov khoom tsim nyog yog qhov tseem ceeb tshaj plaws.
