Thaum qhov kub ntawm zinc molten yog siab, ib tug loj npaum li cas ntawm hlau yog yaj nyob rau hauv nws. Piv txwv li, thaum rhuab mus rau 510 degree , 0.10% ntawm hlau yog yaj, uas reacts nrog 1.6% ntawm tag nrho cov zinc molten nyob rau hauv lub lauj kaub galvanizing los tsim zinc dross. Thaum qhov kub ntawm cov zinc molten poob mus rau 435 degree, 0.02% ntawm cov hlau tseem nyob hauv cov zinc molten. Txawm li cas los xij, thaum lub sij hawm txias, hlau precipitates tawm ntawm molten zinc li me me hlau-zinc compound crystals thiab maj mam nyob rau hauv qab ntawm lub lauj kaub galvanizing. Yuav kom txo cov me me crystalline zinc dross (hlau-zinc alloy) nyob rau hauv molten zinc, cov zinc molten yuav tsum tau khaws cia nyob ib ncig ntawm 435 degree txog ib hnub tom qab tau rhuab mus rau qhov kub thiab txias. Qhov no yog kiag li tsis tso cai nyob rau hauv lub tswv yim ua hauj lwm, yog li ntawd lub galvanizing kub tsuas yog yuav txo tau.
Lub caij no, thaum kub ntawm cov zinc molten nce, convective tshav kub hloov intensifies, nqa zinc dross mus rau sab saum toj ntawm lub galvanizing lauj kaub, paug cov molten zinc nyob rau hauv lub qhov tob ntawm immersion, thiab deteriorating qhov zoo ntawm galvanized txheej. Lub xub ntiag ntawm zinc dross ua rau cov dej ntws ntawm cov zinc molten, uas tuaj yeem tshem tawm cov hlau-zinc alloy txheej ntawm cov phab ntsa ntawm lub lauj kaub galvanizing, tawm hauv cov phab ntsa tsis muaj kev tiv thaiv thiab ua kom corrosion, uas nyob rau hauv lem nce zinc dross.
Yog hais tias zinc dross tseem nyob rau hauv lub lauj kaub galvanizing ntev, nws yuav ci rau hauv ib qho khoom thaiv, uas ua rau muaj qhov kub thiab txias. Qhov no tsis tsuas yog ua rau kev tshem tawm nyuaj tab sis kuj cuam tshuam cov cua sov ntawm lub lauj kaub galvanizing, uas ua rau overheating thiab perforation ntawm lub lauj kaub phab ntsa (steel phaj), ua rau zinc to.
Nyob rau hauv ib txwm ua haujlwm kub-dip galvanizing txheej txheem, cov ntsiab lus hlau nyob ze ntawm qhov chaw ntawm zinc molten yuav tsum tsawg, feem ntau tsis tshaj 0.05%. Yog tias nws ncav cuag lossis tshaj 0.2%, kub-dip galvanizing yuav tsum tsis txhob ua ntxiv lawm. Txij li thaum lub immersion qhov tob yog nyob ib ncig ntawm 400mm, qhov twg cov ntsiab lus hlau yuav ntau dua, nws yuav tsum tau tswj kom zoo.
