1.Dab tsi yog teeb meem autoxidation?
Nws yog dab tsi? Thaum lub npoo ntawm cov galvanized coils los rau hauv kev sib cuag nrog dej los yog condensation rau ncua sij hawm nyob rau hauv ib tug ntub, tsis zoo ventilated ib puag ncig (xws li lub warehouse los yog shipping thawv), muaj tshuaj tiv thaiv tshwm sim, tsim ib tug dawb, ntxeem tau txheej ntawm zinc corrosion khoom (feem ntau yooj yim zinc carbonate).
Vim li cas thiaj tsim kev puas tsuaj?
Porosity: This layer of white rust doesn't protect the underlying metal like dense aluminum oxide does, effectively blocking the ingress of moisture and air.
Tsis muaj kev tiv thaiv: Dawb xeb txuas ntxiv txhim kho, maj mam eroding txheej zinc txheej thiab txo tag nrho cov kev tiv thaiv corrosion lub neej.
Kev cuam tshuam rau kev ua haujlwm tom ntej: Cov xeb dawb tuaj yeem cuam tshuam qhov adhesion ntawm txheej, ua rau muaj qhov tsis xws luag yog tias yuav tsum tau pleev xim lossis pleev xim yas.
Xaus: Qhov no ntuj oxidation yuav tsum tau zam, vim nws tsis muaj zog tiv thaiv corrosion.
2.Qhov txiaj ntsig "oxidation" ua haujlwm li cas?
Kev hloov tshuaj lom neeg: Cov coil galvanized hla dhau los ntawm cov tshuaj lom neeg tshwj xeeb (feem ntau yog chromium -muaj lossis chromium- cov tshuaj dawb passivation).
Protective Film Formation: The solution reacts with the fresh zinc layer, forming an inactive, dense composite oxide film (conversion film) only tens to hundreds of nanometers thick.
Mechanism ntawm kev ua haujlwm:
Barrier Effect: This film is extremely dense, acting like a shield to effectively isolate the zinc layer from external corrosive media (water vapor, oxygen, and chloride ions).
Tus kheej -Kho nyhuv (tshwj xeeb tshaj yog rau chromium- muaj passivation): Yog hais tias cov zaj duab xis passivation txawm me ntsis puas, cov chromate ions hauv zaj duab xis yaj thiab tsiv mus rau qhov chaw puas, tsim ib txheej tiv thaiv ntxiv los tiv thaiv corrosion ntxiv.
3.Yuav ua li cas passivation kev kho mob "txhim kho corrosion"?
Qhov Tseem Ceeb Tshaj Plaws Dawb Xwb Onset: Passivated galvanized coils tuaj yeem pom cov xeb dawb (feem ntau ntsuas hauv cov qauv ntsev tshuaj tsuag) uas yog ob mus rau yim zaug lossis ntev dua li cov coils tsis kho. Piv txwv li, cov ntawv galvanized uas tsis tau kho yuav pom cov xeb dawb hauv 48 teev, thaum chrome-dawb passivation tuaj yeem kav ntev dua 120 teev, thiab chrome-muaj cov kab mob tuaj yeem kav ntev dua 200 teev.
Muab qhov ruaj khov, zoo ib yam: Cov zaj duab xis passivation muab lub hauv paus zoo dua, zoo ib yam rau cov txheej tom ntej (yog tias xav tau), txhim kho adhesion ntawm cov xim lossis hmoov txheej.
Txo kev pheej hmoo thaum khaws cia thiab thauj mus los: Txawm tias tsis siv tam sim ntawd, passivation muab kev tiv thaiv kev tiv thaiv kev puas tsuaj los ntawm kev ya raws hauv kev cia lossis thaum caij tsheb thauj mus los.
4.Yuav ua li cas puas tsuaj ntuj tsim oxidation (dawb xeb) piv rau cov txiaj ntsig passivation kev kho (xws li oxidation)?
Tsim: Kev puas tsuaj ntuj tsim oxidation yog tswj tsis tau thiab tshwm sim nyob rau hauv ib qho chaw ntub dej; Kev kho mob zoo passivation yog tswj thiab tsim los ntawm kev kho tshuaj hauv cov kab ntau lawm
Zaj duab xis qauv: teeb meem ntuj oxidation yog xoob, ntxeem tau thiab tsis sib xws; Cov txiaj ntsig passivation kev kho mob yog ntom, ruaj khov thiab sib xws
5.Dab tsi yog qhov txawv tom qab galvanized coil mus los ntawm kev tswj "oxidation kev kho mob"?
Nws tuaj yeem txhim kho nws cov kev tiv thaiv kev tiv thaiv zoo heev, tshwj xeeb tshaj yog tiv thaiv kev tsim cov xeb dawb thaum khaws cia thiab kev thauj mus los. Qhov peb feem ntau hu ua "oxidation xeb" yog hais txog kev puas tsuaj ntuj tsim oxidation, uas yuav tsum tau zam.