Hlau (Fe) tshwm silvery-dawb, 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 cov yeeb nkab steel, steel galvanizing pots, steel machinery thiab khoom siv, thiab molten zinc, uas tom qab ntawd poob rau hauv cov zinc molten;
(3) Zinc slag tsim los ntawm cov tshuaj tiv thaiv ntawm cov hlau ntsev adhering rau steel kav tom qab pickling thiab molten zinc. Raws li cov lus ceeb toom, ib feem ntawm cov ntsev hlau tuaj yeem ua rau muaj nees nkaum tsib feem ntawm zinc.
Qhov siab dua cov ntsiab lus hlau hauv molten zinc, ntau zinc slag raug tsim, thiab cov viscosity ntawm molten zinc nce, ua rau cov dej tsis zoo thaum lub sij hawm zinc ntws, cov txheej tuab (feem ntau η-theem), thiab txheej txheej galvanized ua nkig, tsis muaj kev hloov pauv, nthuav tawm qhov dull nto, thiab ntxhib. Qee cov ntaub ntawv qhia tau hais tias thaum cov ntsiab lus hlau hauv zinc nce mus txog ob peb kaum-txhiab, nws ua rau qhov nyuaj ntawm zinc txheej thiab cuam tshuam cov txheej txheem recrystallization. Thaum cov ntsiab lus hlau ncav cuag 0.02%, lub neej ntev ntawm cov txheej galvanized yog luv heev (nrog zinc raws li cov anode), thiab txhuas los yog silicon feem ntau ntxiv kom tshem tawm cov hlau. Yog li ntawd, thaum lub sijhawm ua haujlwm galvanizing ib txwm, nws tau teev tseg tias cov ntsiab lus hlau los ntawm qhov chaw ntawm cov zinc molten mus rau qhov tob ua haujlwm yuav tsum tsis pub tshaj 0.05% (sib npaug rau Zn-4 rau Zn-5). Yog tias siv zinc remelted, nws tsis raug tso cai thaum nws cov ntsiab lus hlau ncav cuag 0.2%. 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 txheej galvanized 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 cubic meter. Qhov no qhia tau tias muaj kev noj ntau ntxiv ntawm zinc. Cov hlau hauv molten zinc tsuas yog cuam tshuam rau η-theem ntawm cov zinc txheej ntshiab thiab tsis muaj kev cuam tshuam rau cov hlau-zinc cov tshuaj tiv thaiv.
