This paper discusses the effect of various process parameters (such as AC voltage, pressuring method,bath temperature and time) on the colouring film of aluminum and its alloy at the time of AC electrolytic colouring in Ni-Sn mixing salt bath after the anodic oxidation with three acids, which gives rise to an optimum rolouring volt(?)ge, obtaining the fluctuating pattern and control ranges of T-t curves.
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