Thaum lub sij hawm kub-dip galvanizing ntau lawm, ib txheej ntawm zinc tshauv (feem ntau zinc oxide) ntab rau saum npoo ntawm zinc molten thiab ua thicker dua lub sij hawm. Yog tias tsis tau muab tshem tawm, nws tuaj yeem ua rau tsis muaj xim dub ntawm cov kav dej galvanized, uas ua rau cov khoom tsis zoo. Yog li ntawd, cov neeg ua haujlwm kub-dip galvanizing feem ntau skim zinc tshauv los ntawm qhov chaw ntawm zinc molten. Feem ntau, hauv cov txheej txheem siv zinc chloride + ammonium chloride ua cov kuab tshuaj, zinc tshauv yog skimmed txhua ib nrab teev los yog li ntawd; Thaum cov txheej txheem siv hydrochloric acid ua cov kuab tshuaj, zinc tshauv yuav tsum tau skimmed txhua 5 mus rau 6 feeb. Qhov no yog vim qhov tseeb tias yav tas los hnyav ua rau cov zinc tshauv tsawg, thaum lub tom kawg generates ntau dua.
Nyob rau hauv kub-dip galvanizing ntau lawm, tsim cov hlau-zinc alloys, piv txwv li, lub peev xwm los coated steel yeeb nkab substrate nrog ib tug zinc txheej, yuav tsum tau ib tug huv si nto tsis muaj paug los ntawm hlau oxide txheej thiab lwm yam impurities. Yog li ntawd, cov kuab tshuaj (fluxes) yog siv los tiv thaiv thiab ntxuav qhov chaw ntawm cov kua qaub-ntxuav steel yeeb nkab substrate los ntawm oxidation los ntawm oxygen nyob rau hauv cov huab cua. Tom qab cov yeeb nkab steel yog immersed nyob rau hauv cov zinc molten, cov kuab tshuaj kuj tuaj yeem cuam tshuam cov av ntawm qhov molten zinc. Nyob rau tib lub sijhawm, zinc tshauv thiab hnyav residue raug tsim. Thaum muaj ntau cov zinc tshauv nyob rau ntawm cov yeeb nkab steel nkag rau ntawm qhov chaw ntawm zinc molten, cov kuab tshuaj yog thawj zaug hlawv. Txawm hais tias nws tsis raug hlawv, nws tsis tuaj yeem tawg ntau cov zinc tshauv hauv cov zinc molten. Yog li ntawd, cov ntshiab hlau hlau yeeb nkab substrate yog tam sim ntawd raug rau huab cua los yog zinc tshauv, thiab ib tug oxide txheej los yog hnyav residue yuav sai sai tsim nyob rau hauv nws nto, uas ua rau uncoated dub me ntsis. Yog li ntawd, nws yuav tsum nquag skim zinc tshauv rau saum npoo ntawm cov zinc molten kom cov zinc kua nto ntawm cov yeeb nkab steel nkag ib txwm yog xim hlau thiab ci. Ntev npaum li cov txheej txheem yav dhau los tau ua tiav zoo, thaum lub sijhawm kub-dip galvanizing txheej txheem, nws tuaj yeem ua kom ntseeg tau tias zinc txheej yog coated yam tsis muaj qhov tsis sib xws vim zinc tshauv thiab lwm yam.
Txawm li cas los xij, ntau zaus skimming kuj muaj qee qhov tsis zoo. Tom qab skimming zinc tshauv, lub ci hlau nto yog nthuav tawm ntawm qhov chaw ntawm zinc molten. Cov hlau ntshiab no, nyob rau hauv qhov kub thiab txias, yuav sai sai ua ke nrog oxygen hauv huab cua los ua zinc tshauv. Yog tias siv cov zinc ntxiv molten, aluminium oxide kuj yuav raug tsim. Yog li ntawd, qhov ntau zinc tshauv yog skimmed, ntau dua cov zinc tshauv generated, ua rau muaj kev nce nqi zinc noj thiab nqi. Yog li ntawd, cov neeg ua haujlwm paub txog tau paub qhov zoo tshaj plaws ntawm lub sijhawm skimming los ntawm kev xyaum.
