在不同工艺参数下利用电刷镀技术制备镍-碳纳米管纳米镀层.将碳纳米管添加到刷镀镍的基础镀液中,并以球磨的方式加以分散.镀液中碳纳米管质量浓度为3g/L.利用扫描电子显微镜和X-射线衍射对镀层晶粒尺寸、显微结构以及形貌进行分析,利用显微硬度仪和球磨磨损试验机对镀层硬度及磨损量进行测试.结果表明,在直流电流下所制备的Ni/CNT镀层的晶粒尺寸约为20 nm;在脉冲电流下,Ni/CNT镀层晶粒尺寸有所降低,并且当脉冲宽度变短时,镀层表面更为平整.随着热处理温度的升高,Ni/CNT镀层的晶粒尺寸有所增加,当加热温度达到500℃时,镀层晶粒尺寸超过50 nm.脉冲电流下所制备的镀层的显微硬度明显高于直流电流下,并且随着脉冲的变短镀层硬度增大.在300℃以下时,Ni/CNT镀层硬度有轻微变化,当温度升高到400℃以上时,镀层硬度明显降低.脉冲电流下所制备复合镀层的耐磨性较直流电流下更好,并且随着脉冲的变短,镀层耐磨性增强.
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