Feem ntau, txhuas tsis ntxiv rau zinc da dej thaum ua haujlwm "ntub txheej txheem" rau kub-dip galvanizing. Yog tias aluminium ntxiv rau zinc da dej, vim nws qhov qis dua piv rau zinc, nws yuav ntab rau saum npoo ntawm zinc da dej. Lub flux siv nyob rau hauv "ntub txheej txheem" kub-dip galvanizing yog ncaj qha muab tso rau ntawm zinc da dej nto. Yog li ntawd, cov flux thawj zaug los rau hauv kev sib cuag nrog txhuas txheej ntawm qhov chaw, ua rau muaj kev cuam tshuam ntawm ob qho tib si, uas ua rau tsis muaj zog aluminium trichloride. Qhov sib npaug ntawm cov tshuaj tiv thaiv yog raws li nram no:
3ZnCl₂ + 2Al → 3Zn + 2AlCl₃↑
Los ntawm qhov sib npaug saum toj no, nws tuaj yeem pom tias cov zinc tsis tshua muaj zog yog hloov los ntawm ntau reactive txhuas nyob rau hauv nws cov compound (ZnCl₂), ua aluminium trichloride (AlCl₃). Aluminium trichloride tuaj yeem boil txawm nyob rau ntawm qhov kub qis ntawm 123 degree, yog li nws evaporates sai ntawm cov flux. Meanwhile, unevaporated txhuas trichloride tuaj yeem tsim cov kua qaub insoluble thiab AICl₃·NH₃. AICl₃·NH₃ tuaj yeem boil thiab evaporate ntawm 400 degree. Raws li tau hais los saum toj no, cov evaporation ntawm aluminium compounds ua rau poob ntawm cov ntsiab lus chlorine hauv cov flux, uas ua lub luag haujlwm hauv kev pab galvanization, ua rau tsis muaj galvanizing me ntsis ntawm cov kav dej galvanized.
