Conversion Txheej ntawm Galvanized Steel

Hlau phosphates los yog cov khoom ntxuav-coater tsim me me los yog tsis-detectable conversion txheej ntawm zinc nto. Ntau cov kab hlau sib txuas siv cov hlau phosphates hloov kho uas muaj kev tu, thiab tawm hauv micro-chemical etch ntawm zinc substrates los muab cov khoom adhesion.

Ntau lub nroog thiab xeev tam sim no muaj kev txwv rau zinc PPMs, yuam cov hlau tiav los muab kev kho mob ntawm cov kev daws teeb meem uas zinc substrates tau ua tiav.

Lub zinc phosphate hloov dua siab tshiab txheej yog, kab tias, cov txheej txheem zoo tshaj plaws uas tuaj yeem ua rau ntawm qhov chaw galvanized. Txhawm rau tsim cov zinc phosphate txheej ntawm galvanized, cov neeg ua haujlwm tshwj xeeb yuav tsum tau ua kom lub ntsej muag txaus kom tau txais zinc phosphate txheej. Cov txheej txheem no yog tsim los ntawm kev ua ntawm cov tshuaj da dej ntawm cov ntaub ntawv saum npoo. Ib qho crystalline zinc phosphate yog qhov tseeb "loj" ntawm qhov chaw huv si. Nyob rau hauv ib tug raug xya theem zinc phosphating chav tsev, ntau theem yog:

1. Alkaline ntxuav.
2. Alkaline ntxuav.
3. Cov dej kub yaug.
4. Zinc phosphate ua kua.
5. Dej txias yaug.
6. Tom qab kev kho mob (xws li chromium lossis nonchromium hom).
7. Deionized dej yaug.

Ib chav rau rau-theem yuav tshem tawm theem 1, thiab tsib-theem chav tsev yuav tshem tawm theem 1 thiab 7.Nyob rau hauv lub hwj chim tshuaj tsuag txoj kev ntawm daim ntawv thov, cov khoom yuav tsum tau coated raug tshem tawm nyob rau hauv ib qhov av thaum cov tshuaj yog pumped los ntawm ib tug tuav tank. thiab sprayed nyob rau hauv siab mus rau qhov chaw. Cov txheej txheem txheej txheem yog recirculated tsis tu ncua.Nyob rau hauv txoj kev immersion ntawm daim ntawv thov, qhov chaw yuav tsum tau coated tom qab ntxuav yog tsuas yog immersed nyob rau hauv ib tug tov ntawm phosphating tov uas muaj nyob rau hauv ib tug stainless hlau tank.The tes-so txoj kev ntawm daim ntawv thov muaj txwv siv nyob rau hauv conversion txheej technology.Phosphate txheej feem ntau yog siv los ntawm kev siv tsib, rau, lossis xya theem. Cov phosphatesolution yog tuav nyob rau hauv qhov kub ntawm 100 mus rau 160 ° F (38 mus rau 71 ° C) rau tshuaj tsuag; 120 txog 200 ° F (49 txog 93 ° C) rau immersion; los yog chav tsev kub rau tes so. Kev siv zinc phosphate txheej hnyav yuav tsum yog 150 txog 300 mg./sq. ft.A lub sijhawm ua haujlwm ntawm 30 mus rau 60 vib nas this los ntawm cov tshuaj tsuag thiab 1 mus rau 5 feeb los ntawm kev immersion yog ib txwm.Phosphating cov ntsiab lus muaj ib tug concentration ntawm 4 mus rau 6% los ntawm ntim thiab yog thov ntawm tshuaj tsuag pres meej ntawm 5 mus rau 10 psi.The zinc phosphate txheej yog tej zaum ib qho ntawm qhov zoo tshaj plaws xim puag txheej ntawm galvanized hlau. Ib qho kev daws teeb meem ntawm chromium phosphate tsis tsim cov xim pleev xim rau ntawm cov hlau galvanized.