Tsim cov hlau Passivation thiab Thickness ntawm Passivation Zaj duab xis

Passivation txhais tau tias yog tsim cov txheej txheej tiv thaiv nyias heev ntawm cov khoom siv hlau nyob rau hauv oxidizing tej yam kev mob, ua tiav los ntawm muaj zog anodic polarization, inhibit corrosion.Qee cov hlau lossis alloys tsim cov txheej txheem yooj yim inhibiting ntawm qhov ua kom muaj peev xwm lossis tsis muaj zog anodic polarization, yog li txo tus nqi corrosion.Raws li lub ntsiab lus ntawm passivation, qhov teeb meem no tsis poob nyob rau hauv passivation.

Cov qauv ntawm cov zaj duab xis passivation yog heev nyias, nrog ib tug tuab ntsuas ntawm 1 mus rau 10 nanometers.Kev tshawb pom ntawm hydrogen nyob rau hauv passivation nyias zaj duab xis qhia tau hais tias cov zaj duab xis passivation tej zaum yuav ib tug hydroxide los yog hydrate.Hlau (Fe) yog ib qho nyuaj rau tsim ib tug passivation zaj duab xis nyob rau hauv ib txwm corrosion tej yam kev mob;nws tsuas yog tshwm sim nyob rau hauv ib puag ncig oxidizing heev thiab nyob rau hauv anodic polarization rau siab muaj peev xwm.Hauv qhov sib piv, chromium (Cr) tuaj yeem tsim ib qho chaw ruaj khov, ntom ntom, thiab tiv thaiv zaj duab xis passivation txawm nyob rau hauv ib puag ncig oxidizing me ntsis.Nyob rau hauv cov hlau-raws li alloys uas muaj chromium, thaum cov ntsiab lus chromium tshaj 12%, nws yog hu ua stainless hlau.Stainless hlau muaj peev xwm tswj tau lub xeev passivated nyob rau hauv feem ntau aqueous daws uas muaj ib tug kab nyob rau hauv cov huab cua.Nickel (Ni), piv rau hlau, tsis yog tsuas yog muaj cov khoom siv zoo dua qub (xws li lub zog kub-kub) tab sis kuj pom zoo corrosion kuj nyob rau hauv ob qho tib si uas tsis yog-oxidizing.

Tsim cov hlau Passivation thiab Thickness ntawm Passivation Zaj duab xis

Passivation txhais tau tias yog tsim cov txheej txheej tiv thaiv nyias heev ntawm cov khoom siv hlau nyob rau hauv oxidizing tej yam kev mob, ua tiav los ntawm muaj zog anodic polarization, inhibit corrosion.Qee cov hlau lossis alloys tsim cov txheej txheem yooj yim inhibiting ntawm qhov ua kom muaj peev xwm lossis tsis muaj zog anodic polarization, yog li txo tus nqi corrosion.Raws li lub ntsiab lus ntawm passivation, qhov teeb meem no tsis poob nyob rau hauv passivation.

Cov qauv ntawm cov zaj duab xis passivation yog nyias nyias, nrog ib tug tuab ntsuas ntawm 1 mus rau 10 nanometers.Kev tshawb pom ntawm hydrogen nyob rau hauv passivation nyias zaj duab xis qhia tau hais tias cov zaj duab xis passivation tej zaum yuav ib tug hydroxide los yog hydrate.Hlau (Fe) yog ib qho nyuaj rau tsim ib tug passivation zaj duab xis nyob rau hauv ib txwm corrosion tej yam kev mob;nws tsuas yog tshwm sim nyob rau hauv ib puag ncig oxidizing heev thiab nyob rau hauv anodic polarization rau siab muaj peev xwm.Hauv qhov sib piv, chromium (Cr) tuaj yeem tsim ib qho chaw ruaj khov, ntom ntom, thiab tiv thaiv zaj duab xis passivation txawm nyob rau hauv ib puag ncig oxidizing me ntsis.Nyob rau hauv cov hlau-raws li alloys uas muaj chromium, thaum cov ntsiab lus chromium tshaj 12%, nws yog hu ua stainless hlau.Stainless hlau muaj peev xwm tswj tau lub xeev passivated nyob rau hauv feem ntau aqueous daws uas muaj ib tug ib feem ntawm cov huab cua.Nickel (Ni), piv rau cov hlau, tsis yog tsuas yog muaj cov khoom siv zoo dua qub (xws li lub zog kub-kub) tab sis kuj muaj kev tiv thaiv corrosion zoo heev hauv ob qho tib si uas tsis yog-oxidizing thiab oxidizing ib puag ncig.Thaum cov ntsiab lus npib tsib xee hauv cov hlau ntau dua 8%, nws ua kom lub ntsej muag-centered cubic qauv ntawm austenite, ntxiv dag zog rau kev muaj peev xwm thiab txhim kho kev tiv thaiv corrosion.Yog li ntawd, chromium thiab npib tsib xee yog ib qho tseem ceeb alloying ntsiab nyob rau hauv steel.and oxidizing ib puag ncig.Thaum cov ntsiab lus npib tsib xee hauv cov hlau ntau dua 8%, nws ua kom lub ntsej muag-centered cubic qauv ntawm austenite, ntxiv dag zog rau kev muaj peev xwm thiab txhim kho kev tiv thaiv corrosion.Yog li ntawd, chromium thiab npib tsib xee yog ib qho tseem ceeb alloying ntsiab nyob rau hauv steel.