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采用不对称交流脉冲电位法在镀镍工件表面制备聚8–羟基喹啉薄膜。研究了阶跃电位、阶跃时间、重复次数和溶液中8–羟基喹啉含量等工艺条件对电沉积聚8–羟基喹啉薄膜的影响。分别采用塔菲尔曲线测量、扫描电镜和能谱分析对电沉积后工件的耐蚀性、薄膜的表面形貌和组成进行分析。最佳工艺条件为:8–羟基喹啉0.002mol/L,氢氧化钠0.4mol/L,正阶跃电位0.55V,负阶跃电位0.05V,正阶跃时间0.2s,负阶跃时间0.1s,重复次数100。采用最佳工艺处理后,工件的腐蚀电位、腐蚀速率分别为0.32V和4.1581×103g/(m2·h),耐蚀性优于未处理的工件,且与铬钝化处理的工件相当。
Poly (8 - hydroxyquinoline) films were prepared on the surface of nickel - plated workpiece by asymmetrical AC pulse potential method. The effects of process conditions such as step potential, step time, number of repetitions and content of 8-hydroxyquinoline in solution on the poly-8-hydroxyquinoline films were studied. The corrosion resistance of the electrodeposited workpiece, the surface morphology and composition of the film were analyzed by Tafel curve measurement, scanning electron microscopy and energy spectrum analysis respectively. The optimum conditions were as follows: 8-hydroxyquinoline 0.002mol / L, sodium hydroxide 0.4mol / L, positive step potential 0.55V, negative step potential 0.05V, positive step time 0.2s, negative step time 0.1 s, the number of repetitions 100. After the best process, the corrosion potential and corrosion rate of the workpiece are 0.32V and 4.1581 × 103g / (m2 · h) respectively. The corrosion resistance of the workpiece is better than that of the untreated workpiece, and it is comparable with that of the chromium passivation.