1.Dab tsi yog lub luag haujlwm tseem ceeb thiab hom passivation txheej?
Lub luag haujlwm tseem ceeb: txhawm rau txhim kho corrosion kuj ntawm zinc plating txheej thiab ncua kev tsim cov xeb dawb.
Hom hom:
Chromium-dawb passivation: Tam sim no cov txheej txheem tseem ceeb hauv ib puag ncig, xws li trivalent chromium passivation, chromium-dawb xiav passivation, thiab chromium- dawb xim passivation. Hom passivation txheej no feem ntau yog cov organic lossis inorganic puas zaj duab xis.
Chromium-muaj passivation: Ib txheej txheem ib txwm siv hexavalent chromium los ua chromate- muaj cov yeeb yaj kiab hloov dua siab tshiab, muab kev tiv thaiv corrosion zoo heev, tab sis nws tau maj mam dhau mus vim kev txhawj xeeb ntawm ib puag ncig.
2.Lub teeb ultraviolet cuam tshuam li cas rau chromium-dawb passivation txheej?
Qhov cuam tshuam yog qhov tseem ceeb. Ultraviolet (UV) hluav taws xob yog qhov tseem ceeb hauv kev laus ntawm cov ntaub ntawv polymer. Yog tias cov txheej txheej passivation muaj cov organic resins lossis cov khoom siv, qhov ntev ntev ntawm UV hluav taws xob yuav ua rau cov khoom siv organic no mus rau hauv daim duab - oxidation, ua rau cov hmoov nplej, tawg, tsis muaj luster, thiab microcracks.
Thaum cov zaj duab xis passivation puas lawm, lub hauv paus zinc txheej yog ncaj qha mus rau saum huab cua, uas yuav ua rau dawb xeb tsim sai sai, ua rau nws tsis zoo.
3.Dab tsi cuam tshuam ultraviolet lub teeb muaj rau chromium passivation txheej?
Nws muaj me ntsis zoo dua cov txheeb ze kuj. Hexavalent chromium hloov dua siab tshiab txheej yog feem ntau inorganic, thiab lawv ruaj khov rau ultraviolet lub teeb yog siab dua li cov khoom siv organic. Txawm li cas los xij, lawv cov kev tiv thaiv corrosion yuav maj mam txo lub sijhawm.
4.Dab tsi cuam tshuam ultraviolet lub teeb rau ntawm zinc plating nws tus kheej?
Zinc nws tus kheej tsis rhiab rau ultraviolet lub teeb. Qhov teeb meem tseem ceeb nyob hauv "lub tsho sab nrauv" uas tiv thaiv zinc- zaj duab xis passivation.
5.Dab tsi tshwj xeeb xav tau thaum siv galvanized coils sab nraum zoov hauv ib puag ncig uas lawv yuav raug tshav ntuj rau lub sijhawm ntev (xws li lub ru tsev thiab cov phab ntsa sab nrauv)?
Luv-term vs. Ntev-term:
luv- lub sij hawm cia / thauj: Ordinary passivated galvanized coils yog zoo txaus; Cov teebmeem ntawm UV hluav taws xob tsis yog qhov tseem ceeb hauv lub sijhawm luv.
Ntev- siv sab nraum zoov ntev: Kev cia siab rau ntawm cov txheej txheem passivation nkaus xwb yuav txo nws txoj kev tiv thaiv lub neej.
Txuj kev xyaum: Txheej (Pre-painted steel ntawv)
Hauv kev tsim kho sab nraum zoov, tus qauv kev coj ua yog siv ua ntej -painted steel sheets/coils.
Ua ntej- cov ntawv pleev xim hlau yog tsim los ntawm txheej txheej ib lossis ntau txheej ntawm cov organic coatings (xws li polyester, silicone- hloov polyester, PVDF, thiab lwm yam) mus rau ib qho galvanized substrate (tom qab passivation).
Lub topcoat no yog tsim tshwj xeeb los tiv thaiv ntau qhov chaw hnyav, suav nrog:
UV hluav taws xob: UV absorbers thiab stabilizers yog ntxiv rau txheej kom zoo tiv thaiv kev laus.
Los nag, acid nag
Kub hloov pauv
Nyob rau hauv cov ntaub ntawv no, cov txheej txheem passivation, raws li hauv qab txheej, feem ntau ua hauj lwm los txhim kho qhov adhesion ntawm substrate thiab txheej thiab muab "sacrificial anode" kev tiv thaiv, thaum lub luag hauj lwm ntawm UV tsis kam yog tag nrho ua los ntawm lub sab nrauv pre- pleev xim rau txheej.