Ni-P-纳米ZrC化学复合镀的结构与性能

Structure and Properties of N-P-nano ZrC Composite Coating on AZ31 Mg Alloy

采用化学镀技术,在AZ31镁合金表面制备出Ni-P-纳米Zr C复合镀层。使用扫描电镜、显微硬度计和磨损试验机研究了不同纳米Zr C浓度对复合镀层微观形貌、镀速、硬度和磨损性能的影响。结果表明,复合镀层为胞状结构,镀液中添加适量的纳米Zr C颗粒能细化镀层胞状结构的尺度,提高镀速,增加镀层厚度;而且显著提高镀层的硬度和耐磨性。镀液中的纳米Zr C颗粒添加量为1.5g/L时,所得Ni-P-纳米Zr C复合镀层的胞状结构较细小,镀速最快,硬度达到最高值892 HV,耐磨性比Ni-P镀层更高。

Ni-P-na no Zr C composite coating was produced by electroless plating technique on AZ31 Mg alloy surface.The influences of different concentrations of nano Zr C particles on microstructure, deposition rate, micro-hardness and wear resistance were studied by SEM, micro-hardness tester and wearing test machine respectively. The results show that the composite coating possesses cellular structure, and the right amounts nano Zr C particles in the bath can refine the size of cellular structure of coating, increase the deposition rate and thickness of coating. The nano Zr C particles in coating can also significantly improve the hardness and wear resistance of composite coating. When the adding amount of nano Zr C particles in the bath is 1.5 g/L, the Ni-P-nano Zr C composite coating shows smaller cellular structure, the fastest deposition rate, the highest micro-hardness of 891.9 HV, and better wear resistance than that of Ni-P coatings.