Tus cwj pwm corrosion ntawm zinc coatings txawv heev ntawm cov uas tsis yog-acidic / alkaline thiab acidic / alkaline cua. Feem ntau hais lus, thaum tsis muaj acidic lossis alkaline cua, zinc txheej nto reacts nrog oxygen hauv huab cua los tsim zinc oxide (ZnO). Nyob rau hauv lub xub ntiag ntawm noo noo, zinc hydroxide [Zn(OH)₂] kuj tuaj yeem tsim.
Thaum cov zinc txheej txheej tuaj rau hauv kev sib cuag nrog acidic lossis alkaline cua thiab noo noo, zinc sulfate (ZnSO₄), zinc chloride (ZnCl₂), zinc hydroxide [Zn (OH) ₂], thiab zinc carbonate (ZnCO₃, nco ntsoov: ZnCO₈ yog tsis yog tus qauv tshuaj formula rau zinc carbonate) yuav raug tsim. Tus nqi corrosion ntawm zinc txheej txawv nrog tus nqi pH ntawm kev daws teeb meem ntawm cov cua thiab dej. Daim duab 1-1 qhia plaub thaj chaw muaj nqi pH: hauv qab pH 6 yog thaj chaw acidic uas muaj qhov sib cais siab tshaj plaws; nruab nrab ntawm pH 6 thiab 12.5 yog thaj chaw ruaj khov uas zinc ntsev ntawm cov zinc txheej txheej tsim ib qho kev tiv thaiv zoo; pH qhov tseem ceeb ntawm 12.5 thiab 13.5 yog qhov dilute alkaline cheeb tsam; thiab siab dua pH 13.5 yog qhov muaj zog alkaline cheeb tsam. Nws tuaj yeem pom tias tus cwj pwm corrosion ntawm zinc coatings nyob rau hauv non-acidic / alkaline thiab acidic / alkaline atmospheres yog txawv kiag li.
