Galvanized steel kav dej rau cov roj dej (txheej txheem tshiab GB 3091-82, tseem 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 tus cwj pwm corrosion ntawm zinc coatings hauv cov kais dej. Txhawm rau tshawb xyuas qhov corrosion nyob rau hauv qhov chaw no, peb yuav tsum xub nkag siab txog qhov muaj pes tsawg leeg ntawm cov kais dej. Feem ntau, 1 liter dej kais dej muaj 10 milligrams ntawm cov pa oxygen, uas ua rau cov zinc txheej los ua zinc hydroxide. Cov zinc hydroxide no tsis muab kev tiv thaiv thiab muaj nyob rau hauv cov khoom siv corrosion. Cov dej mos, uas muaj ntau dua cov pa oxygen, carbon dioxide, thiab sodium ntsev (dej softened los ntawm chemical method), accelerates tus nqi corrosion ntawm zinc coatings. Cov dej tawv, uas muaj aluminium hydroxide, silicic acid, phosphates, magnesium ntsev, thiab calcium carbonate, tiv thaiv cov zinc txheej, ua rau cov kav hlau galvanized tiv taus corrosion hauv cov dej tawv dua li cov dej mos.
Tus nqi pH ntawm kais dej feem ntau yog li ntawm 7.5 txog 9.5. Thaum calcium bicarbonate, sulfides, chlorides, thiab nitrides nyob rau hauv cov qib tso cai, zinc txheej yuav ruaj khov thiab tiv thaiv los ntawm kev tsim cov txheej txheem uas tsis yog-soluble carbonate.
Qhov sib ntxiv ntawm cov kua chlorine rau kev tua kab mob thiab ua kom tsis muaj menyuam hauv cov kais dej yog qhov tsis zoo rau cov zinc txheej, ua rau muaj kev xeb hnyav. Thaum cov zinc txheej muaj ntau tshaj {{0}}.28% tin, pitting corrosion yuav tshwm sim hauv kais dej. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tsis txhob txhob txwm ntxiv tin rau txheej ntawm cov kav dej kub-dip galvanized steel kav siv rau cov kais dej. Feem ntau hais lus, tus nqi corrosion ntawm tin-dawb zinc txheej hauv cov dej txias yog kwv yees li 0.66 milligrams ib square decimeter ib hnub, thaum tus nqi corrosion ntawm tin-muaj zinc txheej yog li 2.03 milligrams ib square decimeter ib hnub twg.
