[China Aluminum Industry Network] 1 Foreword The electrolytic coloring method can improve the decorative performance of aluminum profiles, and can freely obtain various shades, and is widely used in the surface treatment of aluminum profiles. Nickel salt electrolytic coloring method is to make the nickel ion electrochemical reduction reaction on the surface of the barrier layer in the micropores of the oxide film under a certain current and voltage, and deposit on the bottom of the oxide film hole, so that the surface of the aluminum material shows a color Kind of coloring method. It has a slow deposition rate, a stable coloration, and a great advantage in light coloring, enabling automated production, nickel recovery, and cost savings. At present, the nickel salt coloring method has been widely applied [1]. Nickel salt electrolysis in the black process tends to appear hair yellow, white spots and prone to appear black or not in the production process. For this reason, this article through the correct detection of nickel sulfate, boric acid concentration to maintain the normal operation of the coloring tank, and the analysis of nickel coloring problems. 2 experiments 2.1 Experimental process Industry generally adopts the production process flow shown in Fig. 1, and the tests and analysis in this paper are performed according to this process. 2.2 Nickel coloring process conditions (1) Formula: Nickel sulfate 150±5g/l Boric acid 45±3g/l Temperature 25±3°C pH 4.1±3
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