Hlau (Fe) yog silvery-dawb nyob rau hauv cov xim, nrog ib tug txheeb ze atomic mass ntawm 56. Lub melting point ntawm ntshiab hlau yog 1535 degree, thiab nws boiling point yog 3000 degree. Lub hauv paus ntsiab lus ntawm hlau nyob rau hauv molten zinc yog:
(1) Taw qhia los ntawm remelted zinc nrog cov ntsiab lus hlau siab;
(2) ζ-theem tsim los ntawm cov tshuaj tiv thaiv ntawm zinc kua thiab steel kav, steel galvanizing pots, steel mechanical khoom poob rau hauv zinc kua;
(3) Zinc slag tsim los ntawm cov tshuaj tiv thaiv ntawm cov ntsev hlau txuas nrog cov kav hlau tom qab pickling thiab zinc kua. Raws li cov ntaub ntawv, ib feem ntawm hlau ntsev tuaj yeem hnov mob nrog nees nkaum tsib feem ntawm zinc.
Qhov siab dua cov ntsiab lus hlau hauv molten zinc, ntau zinc slag raug tsim, ua kom cov viscosity ntawm zinc kua. Qhov no ua rau cov dej tsis zoo thaum lub sij hawm zinc ntws, cov coatings thicker (feem ntau η-theem), thiab galvanized coatings ua nkig, tsis yooj yim, nrog rau dull thiab ntxhib tsos. Qee qhov chaw qhia tau hais tias cov ntsiab lus hlau hauv zinc ntawm qib ppm tuaj yeem ua rau cov tawv tawv ntawm zinc txheej thiab cuam tshuam cov txheej txheem recrystallization. Thaum cov ntsiab lus hlau ncav cuag 0.02%, lub neej ntev ntawm cov galvanized txheej yog luv luv (nrog zinc raws li cov anode), thiab txhuas lossis silicon feem ntau yog ntxiv kom tshem tawm cov hlau. Yog li ntawd, hauv kev ua haujlwm galvanizing ib txwm, cov ntsiab lus hlau los ntawm qhov chaw ntawm lub galvanizing da dej mus rau qhov tob ua haujlwm yuav tsum tsis pub tshaj 0.{{10}}5% (sib npaug rau Zn{{5} } rau Zn-5). Yog tias siv zinc remelted, cov ntsiab lus hlau ntawm 0.2% tsis raug tso cai. Kev sim ua pov thawj qhia tau hais tias nyob rau tib qhov kub ntawm 450 degree, thaum cov ntsiab lus hlau hauv molten zinc yog 0.06%, qhov hnyav ntawm galvanized txheej yog 330 grams ib square meter, thiab thaum cov ntsiab lus hlau yog 0.25%, qhov hnyav ntawm galvanized. txheej nce mus txog 450 grams ib square meter. Qhov no qhia tau tias muaj kev noj ntau ntxiv ntawm zinc. Hlau nyob rau hauv molten zinc tsuas yog cuam tshuam rau η-theem ntawm cov zinc txheej ntshiab thiab tsis muaj kev cuam tshuam loj rau cov tshuaj tiv thaiv hlau-zinc.
