Qhov kev tiv thaiv corrosion ntawm stainless hlau yog tsuas yog vim qhov saum npoo yog them nrog nyias nyias (li 1nm) tuab passivation zaj duab xis, zaj duab xis no yog qhov yooj yim barrier ntawm stainless hlau tiv thaiv. Stainless hlau passivation muaj cov yam ntxwv zoo, yuav tsum tsis txhob suav tias yog kev ua tiav ntawm kev xeb, tab sis tsim kom muaj qhov sib txawv ntawm txheej thaiv, kom cov tshuaj tiv thaiv anodic txo qis heev. Feem ntau nyob rau hauv lub xub ntiag ntawm kev txo cov neeg ua hauj lwm (xws li chloride ions) yuav ua kom puas cov zaj duab xis, thaum nyob rau hauv lub xub ntiag ntawm oxidizing agents (xws li huab cua) muaj peev xwm tswj los yog kho cov zaj duab xis.
Stainless hlau workpieces tshuav nyob rau hauv huab cua yuav tsim ib tug oxide zaj duab xis, tab sis cov zaj duab xis no tsis txaus tiv thaiv. Feem ntau yog thawj zaug ntxuav, suav nrog alkaline ntxuav thiab pickling, thiab tom qab ntawd passivation nrog tus neeg sawv cev oxidizing, txhawm rau kom ntseeg tau tias muaj kev ntseeg siab thiab ruaj khov ntawm cov yeeb yaj kiab passivation. Ib qho ntawm cov hom phiaj ntawm pickling yog los tsim cov kev mob zoo rau passivation, los xyuas kom meej qhov tsim ntawm high-zoo passivation zaj duab xis. Vim hais tias los ntawm pickling lub stainless hlau nto qhov nruab nrab ntawm 10μm tuab txheej ntawm lub nto yog corroded tawm, cov tshuaj lom neeg kev ua si ntawm cov kua qaub ua rau lub puas qhov chaw ntawm dissolution tus nqi siab tshaj lwm qhov chaw ntawm lub nto, yog li pickling yuav ua tau tag nrho. nto zoo li yuav sib npaug sib npaug, qee qhov ntawm cov thawj yooj yim ua rau corrosion ntawm cov teeb meem zais raug tshem tawm. Tab sis qhov tseem ceeb tshaj, los ntawm pickling passivation, thiaj li hais tias cov hlau thiab hlau oxides dua chromium thiab chromium oxides nyiam yaj, kom tshem tawm cov chromium-tsis zoo txheej, uas ua rau chromium enriched nyob rau hauv lub nto ntawm stainless hlau, no chromium-nplua nuj passivation zaj duab xis muaj peev xwm. mus txog + (SCE), ze rau lub peev xwm ntawm cov hlau zoo nkauj, txhim kho kev ruaj ntseg ntawm corrosion kuj. Cov kev kho mob sib txawv kuj tseem yuav cuam tshuam rau cov khoom sib xyaw thiab cov qauv ntawm cov yeeb yaj kiab, yog li cuam tshuam rau cov hlau tsis huv, xws li los ntawm kev hloov kho electrochemical ntawm kev kho mob, cov zaj duab xis passivation tuaj yeem ua kom muaj ntau txheej txheej, tsim CrO3 lossis Cr2O3 hauv qhov thaiv. txheej, los yog tsim cov iav oxide zaj duab xis, kom cov hlau tsis muaj steel tuaj yeem ua si qhov siab tshaj plaws corrosion kuj.
