在Q235碳钢表面先预浸镀铜,然后采用超声-电沉积方法获得Cu-SiC纳米复合镀层.研究了纳米SiC含量对纳米复合镀层表面形貌的影响,讨论了阴极电流密度、超声功率、温度和电沉积时间对复合镀层显微硬度的影响,获得了较佳的工艺条件:镀液中SiC纳米颗粒含量9g/L,阴极电流密度6 A/dm2,超声波功率200W,镀液温度30℃,电沉积时间40 min.在此条件下制备Cu-SiC纳米复合镀层,测试了镀层的结合力,并与普通铜镀层进行比较,研究了复合镀层的表面形貌、显微硬度以及在3.5％ NaCl溶液中的电化学阻抗谱(EIS).结果表明,所制备的复合镀层结合力良好,其表面颗粒尺寸在0.5 ～ 1.0 am之间(小于普通铜镀层的1 ～4 μm),显微硬度和反应电阻分别为294.6 HV和2 446.5 Ω·cm2(大于普通铜镀层的162.0 HV和1 538.7Ω·cm2).Cu-SiC纳米复合镀层具有较好的机械性能和耐腐蚀性能.
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