1.Dab tsi yog zinc lub ntuj tsis muaj zog?
Thaum raug huab cua, cov zinc txheej ntshiab reacts nrog oxygen, noo noo, thiab carbon dioxide nyob rau hauv cov huab cua, ib txwm ua ib tug nyias, xoob, thiab ntxeem tau txheej ntawm yooj yim zinc carbonate (feem ntau hu ua "dawb xeb"). Lub ntuj oxide zaj duab xis no tsis ruaj khov thiab tsis tuaj yeem tiv thaiv corrosion ntxiv ntawm zinc hauv, ua rau muaj kev tiv thaiv corrosion tsawg.
2.Lub luag haujlwm ntawm kev kho mob passivation yog dab tsi?
Passivation kev kho mob yog ib qho tshuaj los yog electrochemical txoj kev uas tso cai rau lub galvanized nto react nrog cov passivation tov (feem ntau muaj chromates, phosphates los yog chromium -cov tebchaw dawb) nyob rau hauv kev tswj tej yam kev mob rau artificially tsim ib tug ntom, ruaj khov, thiab nplaum nplaum oxide zaj duab xis. Zaj movie no yog zaj movie "passivation."
3.Yuav ua li cas passivation kho txhim khu kev tiv thaiv corrosion?
Physical Barrier Effects:
Cov zaj duab xis passivation yog tuab heev, ua yeeb yam zoo li ib txheej ntawm armor, zoo cais cov zinc txheej los ntawm corrosive media xws li ya raws thiab oxygen, txo qis tus nqi ntawm electrochemical corrosion.
Tus kheej -Kho nyhuv (tshwj xeeb tshaj yog Chromate Passivation):
Yog hais tias cov zaj duab xis passivation yog nyob rau hauv lub zos puas lawm, cov chromate Cheebtsam nyob rau hauv cov zaj duab xis yaj thiab tsiv mus rau qhov chaw puas, tsim ib tug tshiab tiv thaiv zaj duab xis thiab tiv thaiv ntxiv corrosion ntawm zinc ntawm qhov chaw puas. Qhov kev muaj peev xwm "tus kheej- kho" no yog tus yuam sij rau nws txoj kev tiv thaiv corrosion zoo heev.
Chemical Inertness:
Cov zaj duab xis passivation nws tus kheej yog qhov ruaj khov heev thiab muaj tshuaj lom neeg ntau dua li cov hlau zinc reactive, ua rau nws tsis tshua muaj kev cuam tshuam rau cov tshuaj tiv thaiv corrosive hauv ib puag ncig.
4.Yuav ua li cas passivation piv rau tsis passivation?
Cov galvanized coils uas tau dhau los ua kev kho mob muaj zog tiv thaiv corrosion, thiab lub sij hawm tshuaj tsuag ntsev tuaj yeem txuas ntxiv los ntawm ob peb zaug mus rau kaum ob zaug; cov galvanized coils uas tsis tau txais kev kho mob passivation muaj qhov tsis muaj zog tiv thaiv corrosion thiab ua rau cov xeb dawb sai.
5.Dab tsi yog hom kev kho mob passivation?
Chromate passivation: Ib txwm siv thiab ua tau zoo tshaj plaws, nrog rau tus kheej - kho cov khoom. Txawm li cas los xij, vim muaj cov tshuaj lom ntawm hexavalent chromium thiab cov kev cai nruj ib puag ncig, nws siv tau txwv.
Chromium-dawb passivation: Lub tshuab tseem ceeb niaj hnub no. Txoj kev no siv cov ntaub ntawv zoo ib puag ncig xws li molybdates, silicates, thiab titanium / zirconium systems los tsim ib zaj duab xis passivation. Txawm hais tias nws tus kheej - kho cov khoom yuav tsis zoo li chromate, nws cov corrosion kuj ua tau raws li feem ntau cov ntawv thov thiab yog ib puag ncig zoo.
Roj txheej: Feem ntau siv nrog kev kho mob passivation. Cov roj zaj duab xis muab kev sib cais ntawm lub cev ntxiv, sib koom ua ke nrog cov yeeb yaj kiab passivation txhawm rau txhim kho kev tiv thaiv xeb ntxiv.