Anodizing of ADC 12 Aluminum Die-casting Alloy -Effect of Alloying Elements and Preparation Method on The Film Formation (original) (raw)
The anodizing of ADC 12 aluminum die-casting alloy, ADC 12 without Cu, Fe, or Mn (M-ADC 12), cast ADC 12 (C-ADC 12), and rapidly solidified ADC 12 (RS-ADC 12) has been investigated in 10 and 30wt% H2SO4 solutions at 293K with a constant current density of 100A/m2. Anodic oxide film formation was examined by measuring the time variations in anode potential, the amount of dissolved Al3+, Cu2+ and Fe2+ ions, and the volume of O2 evolved on the anode, as well as by electron microscopic observation of the oxide film. The steady value of the anode potential in 10wt%-solution was 35-57V, increasing in the order C-ADC 12<RS-ADC 12=M-ADC 12<ADC 12. The metal dissolution current was 22-25A/m2, independent of the kind of specimen, while the gas evolution current was 15-30A/m2, increasing in the order M-ADC 12 <RS-ADC 12 =C-ADC 12
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