1.Passivation txheej yog dab tsi?
Cov txheej txheej passivation yog ib qho nyias nyias, ntom thiab ruaj khov tiv thaiv zaj duab xis tsim rau saum npoo ntawm zinc txheej tom qab galvanized coil tau txais kev kho tshuaj (kev kho mob passivation) tom qab galvanizing.
2.Dab tsi yog qhov tseem ceeb ntawm cov txheej txheem passivation?
Tiv thaiv dawb xeb: Thaum lub sij hawm cia thiab kev thauj mus los, zinc yog tiv thaiv los ntawm reacting nrog ya raws nyob rau hauv cov huab cua, uas yuav ua rau cov tsim ntawm "dawb xeb" (ib tug dawb, ntxeem tau, powdery zinc corrosion khoom).
Txhim kho Paint Adhesion: Rau galvanized coils uas tom qab yuav pleev xim rau (txhaj tshuaj-coated), txheej passivation muab qhov huv si, ruaj khov, txhim kho xim adhesion.
Txhim kho Fingerprint Resistance: Qee qhov kev kho mob passivation (xws li chromium-dawb passivation) tuaj yeem tiv thaiv corrosion los ntawm cov ntiv tes sab laug thaum lub sijhawm tsim khoom.
3.Dab tsi yog hom passivation?
Chromate passivation: Cov txheej txheem ib txwm ua uas feem ntau ua rau daj -ntsuab iridescent xim thiab muaj zog corrosion kuj, tab sis nws yog maj mam hloov vim muaj cov tshuaj lom hexavalent chromium.
Chromium-dawb passivation: Cov txheej txheem niaj hnub, ib puag ncig tus phooj ywg uas feem ntau tsim cov pob tshab lossis lub teeb xiav thiab tam sim no yog lub ntsiab lus tseem ceeb.
4.Yuav ua li cas yog passivation txheej hnav los yog puas?
Mechanical hnav - feem ntau hom hnav thiab tsim kua muag
Qhov no yog txoj kev ncaj tshaj plaws ntawm cov txheej txheem passivation yog "nrawm."
Kev Ua Haujlwm thiab Kev Ua Haujlwm: Thaum lub sijhawm ua haujlwm sib sib zog nqus xws li stamping, dabtsi yog khoov, thiab yob txoj kev, cov khoom yuav raug hnyav ncab thiab deformation, uas tuaj yeem ua rau txheej txheej passivation tawg los yog flake hauv qhov chaw deformed.
Kev tuav thiab kev thauj mus los: Kev sib txhuam ntawm cov coils thiab cov ntawv, nrog rau cov khoom siv nqa khoom, tuaj yeem hnav cov txheej txheem passivation.
Kev Tu: Kev txhuam qhov saum npoo nrog cov khoom tawv xws li txhuam hlau thiab cov ntawv xuab zeb ntxhib tuaj yeem ua rau cov txheej txheej passivation thiab cov txheej zinc hauv qab.
Tshuaj Corrosion
Cov Khoom Siv Acidic: Cov txheej txheej passivation kuj tiv taus alkalis tab sis rhiab rau cov acids muaj zog. Acid nag, acidic pollutants nyob rau hauv kev lag luam ib puag ncig, thiab tshuaj slashes tag nrho cov yaj los yog ua puas lub passivation txheej.
Cov khoom muaj zog Alkaline: Kev sib cuag ntev nrog cov hauv paus muaj zog nrog cov pH siab (xws li cov cement ntub thiab pob zeb) tuaj yeem ua rau cov txheej txheem passivation.
Ntev -Lub Sij Hawm Tshaj Tawm: Txawm tias nyob rau hauv ib puag ncig sab nraum zoov yam tsis muaj tshuaj lom neeg, kev raug tshav ntuj ntev ntev, los nag, thiab UV hluav taws xob tuaj yeem maj mam degrade cov txheej txheem passivation.
5.Dab tsi yog qhov tshwm sim ntawm passivation txheej hnav?
Kev poob ntawm cov xeb dawb tsis kam: Cov xeb dawb yuav nyiam tsim nyob rau hauv qhov chaw hnav hauv qhov chaw ntub dej, cuam tshuam rau kev zoo nkauj thiab kev ua haujlwm tom ntej.
Accelerated corrosion: Thaum cov txheej txheej passive puas lawm, cov txheej zinc hauv qab yog ncaj qha mus rau ib puag ncig thiab pib haus nws tus kheej rau kev tiv thaiv kev txi. Thaum cov zinc tseem tiv thaiv cov hlau substrate, lub neej corrosion tag nrho yog luv.
Kev cuam tshuam rau kev pleev xim tom ntej: Rau qhov uas yuav tsum tau pleev xim, xim adhesion nyob rau hauv qhov chaw hnav ntawm cov txheej txheem yog txo, uas yuav ua rau blistering ntxov ntxov los yog flaking ntawm cov xim zaj duab xis.