纳米金刚石的加入对镁合金Ni-P镀层组织和性能的影响

发布时间：2018-03-16 14:00

本文选题：纳米金刚石　切入点：化学复合镀　出处：《表面技术》2016年12期 　论文类型：期刊论文

【摘要】：目的提高镁合金化学镀层的力学性能。方法选择出一组优良镁合金化学镀Ni-P工艺参数,在Ni-P镀液中加入不同的纳米金刚石浓度。通过观察所得镀层的微观组织形貌,对比镀层形貌组织;通过对复合镀层进行热处理,分析镀层组织结构的变化;通过测定金刚石加入前后镀层的摩擦系数,检测了复合镀层的耐磨损性能;通过查看镀层腐蚀斑点数目,检测复合镀层的耐腐蚀性能。结果随着纳米金刚石浓度的增加,复合镀层的形貌越好,当纳米金刚石加入量达到6 g/L时,所得复合镀层的微观形貌均匀、致密。热处理使镀层结构由非晶态变为结晶态,显微硬度明显提高。金刚石的加入致使镀层的摩擦系数降低且稳定,相比化学镀Ni-P镀层,加入金刚石后的复合镀层的腐蚀斑点数较少。结论纳米金刚石的加入大大提高了镀层的力学性能。
[Abstract]:Objective to improve the mechanical properties of electroless magnesium alloy coating. Methods A group of excellent Ni-P process parameters for electroless plating of magnesium alloy were selected and different nano-diamond concentrations were added to the Ni-P bath. The microstructure of the coating was observed. The microstructure of the composite coating was analyzed by heat treatment, and the wear resistance of the composite coating was tested by measuring the friction coefficient of the coating before and after diamond addition. The corrosion resistance of composite coatings was examined by checking the number of corrosion spots. Results with the increase of nanocrystalline diamond concentration, the morphology of composite coatings was better, when the amount of nanocrystalline diamond was 6 g / L, The microstructure of the composite coating is uniform and compact. The microstructure of the composite coating is changed from amorphous to crystalline by heat treatment, and the microhardness is obviously increased. The friction coefficient of the composite coating is decreased and stable compared with that of electroless Ni-P coating with the addition of diamond. Conclusion the addition of nanocrystalline diamond can greatly improve the mechanical properties of the composite coating.
【作者单位】：河南工业大学材料科学与工程学院;
【分类号】：TG174.4

【相似文献】