(1) Kev xeb tsis muaj kev ncaj ncees. Chromium yog qhov yooj yim tshaj rau passivate. Hauv cov huab cua, cov hlau-chromium alloys nrog cov ntsiab lus chromium ntawm ntau dua 12% tuaj yeem ua tus kheej hla lawv tus kheej. Hauv qhov nruab nrab oxidizing, cov ntsiab lus chromium tuaj yeem hla dhau yog tias cov ntsiab lus ntau dua 17%. Hauv qee qhov nruab nrab ntawm cov corrosive, chromium siab thiab ntxiv molybdenum, npib tsib xee, tooj liab thiab lwm yam tuaj yeem tau txais kev txhim kho corrosion zoo.
(2) Intergranular xeb. Ferritic stainless steels thiab austenitic stainless hlau raug rau kev sib kis intergranular, tab sis kev kho qhov muag thiab kev kho cua sov kom tsis txhob muaj qhov xeb no tsuas yog qhov rov qab. Ferritic stainless hlau yog cov cuam tshuam nrog intergranular corrosion thaum nrawm txias los ntawm siab tshaj 925 ° C, thiab lub xeev (thaj chaw lub xeev) uas cuam tshuam rau intergranular corrosion tuaj yeem tshem tawm tom qab lub sijhawm luv luv ntawm tempering ntawm 650-815 ° C. Lub intergranular corrosion ntawm ferritic steel kuj tseem yog los ntawm cov chromium depletion los ntawm carbide nag lossis daus. Yog li, txo cov pa roj carbon thiab nitrogen cov ntsiab lus hauv cov hlau thiab ntxiv cov ntsiab lus xws li titanium thiab niobium tuaj yeem txo qhov kev cuam tshuam ntawm kev cuam tshuam corrosion.
(3) Kev pitting thiab txoj kev tawg. Chromium thiab molybdenum yog qhov tseem ceeb tshaj plaws los txhim kho qhov tsis kam ntawm stainless hlau rau pitting thiab crevice corrosion. Raws li cov ntsiab lus chromium nce ntxiv, cov ntsiab lus ntawm chromium hauv oxide zaj duab xis kuj nce ntxiv, thiab kev muaj tshuaj lom neeg ruaj khov ntawm zaj duab xis nce ntxiv. Molybdenum yog adsorbed ntawm cov hlau nquag ua haujlwm nyob rau hauv daim ntawv ntawm MoO4, inhibits cov yaj ntawm cov hlau, txhawb kev rov txhim kho, thiab tiv thaiv zaj duab xis puas. Yog li ntawd, high-chromium, molybdenum ferritic stainless hlau muaj zoo heev tiv taus pitting thiab crevice corrosion.
(4) Kuj tiv taus kev ntxhov siab corrosion cracking. Vim tias cov yam ntxwv ntawm cov qauv, ferritic stainless hlau tiv taus corrosion nyob hauv nruab nrab qhov twg austenitic stainless hlau tsim kev nyuaj siab corrosion tawg.