Abstract
Formation rate, formation coefficient and C. R. value for anodizing of aluminum in alkaline solutions (LiOH, NaOH, Na3PO4 and NH4OH-NH4F) were investigated. The bath composed of NH4OH-NH4F showed the highest formation coefficient, formation rate and C. R. value among the above alkaline baths, and the relation between bath temperature and current density gave a straight line relationship in the region of 10°C-40°C. Fluoride and water contents in the film increased in proportion to bath temperature, whereas the sp. gr. of the film decreased. The most excellent bath that showed the highest C. R. value had the following contents: 2.3M of NH4OH, 0.1M NH4-tartrate, 0.3M NH4F and 0.1M (NH4)2CO3.
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