Galvanized steel kav dej rau cov roj dej (txheej txheem tshiab GB 3091-82, lub npe hu ua galvanized welded steel kav rau kev thauj mus los ntawm cov dej tsis tshua muaj siab) feem ntau yog siv los ua cov kav dej. Yog li ntawd, nws yog ib qho tsim nyog los kawm txog kev txhim kho corrosion ntawm zinc txheej hauv cov kais dej. Txhawm rau tshawb xyuas qhov corrosion nyob rau hauv ib puag ncig no, nws yog qhov tseem ceeb ua ntej kom nkag siab txog qhov sib xyaw ntawm cov kais dej. Feem ntau, 1 liter dej muaj 10 milligrams ntawm oxygen yaj. Cov pa oxygen yaj no ua rau cov zinc txheej los ua zinc hydroxide, uas tsis muaj kev tiv thaiv tab sis muaj nyob rau hauv cov khoom siv corrosion. Cov dej mos muaj ntau dua cov pa oxygen, carbon dioxide, thiab sodium ntsev (dej softened los ntawm cov tshuaj siv tshuaj), uas ua rau kom tus nqi corrosion ntawm zinc txheej. Cov dej tawv muaj aluminium hydroxide, silicic acid, phosphates, magnesium ntsev, thiab calcium carbonate, uas muaj kev tiv thaiv ntawm zinc txheej. Yog li ntawd, zinc txheej ntawm galvanized steel kav muaj qhov zoo corrosion kuj nyob rau hauv cov dej tawv dua li cov dej mos.
Tus nqi pH ntawm cov kais dej feem ntau yog li ntawm 7.5 txog 9.5. Thaum cov ntsiab lus ntawm calcium bicarbonate, sulfides, chlorides, thiab nitrides nyob rau hauv qhov txwv tsis pub, zinc txheej yog ruaj khov thiab tiv thaiv los ntawm kev tsim cov txheej txheem uas tsis yog-soluble carbonate.
Cov dej kais dej yog kho nrog cov tshuaj chlorine rau kev tua kab mob thiab ua kom tsis muaj menyuam, uas yog qhov tsis zoo rau cov zinc txheej thiab muaj cov nyhuv corrosive. Thaum cov zinc txheej muaj ntau tshaj {{0}}.28% tin, pitting corrosion yuav tshwm sim hauv kais dej. Yog li ntawd, nws yog ib advisable tsis txhob txhob txwm ntxiv tin rau txheej ntawm kub-dip galvanized steel kav siv rau kais dej. Feem ntau hais lus, tus nqi corrosion ntawm tin-dawb zinc txheej hauv dej txias yog kwv yees li 0.66 milligrams ib square decimeter ib hnub twg, thaum tus nqi corrosion ntawm tin-muaj zinc txheej yog li 2.03 milligrams ib square decimeter ib hnub twg.
