Tsim ntawm cov hlau passivation thiab thickness ntawm passivation zaj duab xis

Passivation txhais tau hais tias yog qhov tsim ntawm ib txheej tiv thaiv nyias heev ntawm cov khoom siv hlau hauv qab cov qauv ntawm oxidizing, kom inhibit corrosion. Qee cov hlau lossis alloys muaj kev yooj yim inhibiting txheej txheem ntawm kev 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 xwm txheej no tsis poob qis dua.

Tus qauv ntawm cov zaj duab xis passus yog cov nyias nyias, nrog kev ntsuas tuab nrog 1 txog 10 nanometers. Kev kuaj hniav ntawm hydrogen nyob rau hauv passivation nyias zaj duab xis qhia tias tus uas passivation zaj duab xis yuav yog hydroxide lossis hydleate. Hlau (fe) yog qhov nyuaj rau tsim cov yeeb yaj kiab passivation nyob rau hauv ib txwm corrosion; Nws tsuas yog tshwm sim hauv oxidly oxidizing ib puag ncig thiab nyob rau hauv Anodic Polarization rau cov peev xwm ntau. Nyob rau hauv sib piv, chromium (CR) tuaj yeem tsim tau ruaj khov, ntom, thiab tiv thaiv passive zaj duab xis txawm tias nyob rau hauv cov pa oxidly oxidizing ib puag ncig. Hauv cov hlau-raws li cov alloys muaj cov chromium, thaum cov ntsiab lus chromium tshaj 12%, nws yog hu ua cov hlau tsis muaj zog. Stainless hlau tuaj yeem tswj lub xeev passivated hauv cov kev daws teeb meem feem ntau muaj cov kab ntawm huab cua. Nickel (NI), piv rau cov hlau, tsis yog muaj lub zog zoo dua (suav nrog lub zog zoo dua) tab sis kuj tseem ua pov thawj zoo heev corrosion tsis zoo nyob rau hauv ob qho tib si tsis-oxidizing

Tsim ntawm cov hlau passivation thiab thickness ntawm passivation zaj duab xis

Passivation txhais tau hais tias yog qhov tsim ntawm ib txheej tiv thaiv nyias heev ntawm cov khoom siv hlau hauv qab cov qauv ntawm oxidizing, kom inhibit corrosion. Qee cov hlau lossis alloys muaj kev yooj yim inhibiting txheej txheem ntawm kev 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 xwm txheej no tsis poob qis dua.

Tus qauv ntawm cov zaj duab xis passus yog cov nyias nyias, nrog kev ntsuas tuab nrog 1 txog 10 nanometers. Kev kuaj hniav ntawm hydrogen nyob rau hauv passivation nyias zaj duab xis qhia tias tus uas passivation zaj duab xis yuav yog hydroxide lossis hydleate. Hlau (fe) yog qhov nyuaj rau tsim cov yeeb yaj kiab passivation nyob rau hauv ib txwm corrosion; Nws tsuas yog tshwm sim hauv oxidly oxidizing ib puag ncig thiab nyob rau hauv Anodic Polarization rau cov peev xwm ntau. Nyob rau hauv sib piv, chromium (CR) tuaj yeem tsim tau ruaj khov, ntom, thiab tiv thaiv passive zaj duab xis txawm tias nyob rau hauv cov pa oxidly oxidizing ib puag ncig. Hauv cov hlau-raws li cov alloys muaj cov chromium, thaum cov ntsiab lus chromium tshaj 12%, nws yog hu ua cov hlau tsis muaj zog. Stainless hlau tuaj yeem tswj lub xeev passivated hauv cov kev daws teeb meem feem ntau muaj cov kab ntawm huab cua. Nickel (NI), piv rau cov hlau, tsis yog muaj lub zog zoo dua (suav nrog lub zog zoo dua tshiab Thaum cov neeg siv nyiaj npib tsib xee nyob rau hauv cov hlau tshaj 8%, nws tso cov qauv sib dhos ntawm lub sijhawm Austenite, txuas ntxiv txhawb kev tiv thaiv Corrosion. Yog li ntawd, chromium thiab npib tsib xee yog qhov tseem ceeb heev alloying ntsiab hauv steel.and oxidizing ib puag ncig. Thaum cov neeg siv nyiaj npib tsib xee nyob rau hauv cov hlau tshaj 8%, nws tso cov qauv sib dhos ntawm lub sijhawm Austenite, txuas ntxiv txhawb kev tiv thaiv Corrosion. Yog li ntawd, chromium thiab npib tsib xee yog qhov tseem ceeb ua ke ntawm cov hlau.