Ni-金刚石复合镀层的制备

来源期刊:中南大学学报(自然科学版)2013年第7期

论文作者:王美娟 王日初 彭超群 冯艳 张纯 邓黎洁

文章页码:2688 - 2695

关键词:复合电沉积;温度;pH;镍离子浓度;阴极电流密度;金刚石粉体;镀层表面形貌

Key words:composite electroplating; temperature; pH; concentration of Ni2+; cathode current density; diamond powder; coating surface morphology

摘    要:通过复合电镀方法,在镀镍液中加入粒径为40 μm的金刚石粉体制备Ni-金刚石复合镀层。采用阴极动电位极化方法、扫描电镜和显微硬度计探讨镀液温度、pH、镍离子浓度、电流密度和金刚石粉体质量浓度对镀层质量的影响,优化Ni-金刚石复合镀的工艺参数;采用X线衍射分析仪表征优化后复合镀层的结构。研究结果表明:优化的镀液组成和工艺参数为:NiSO4·6H2O 132 g/L,NiCl2 15 g/L,H3BO3 30 g/L,镀液温度(50±1) ℃,pH 3~4,阴极电流密度4 A/dm2,金刚石粉体质量浓度30 g/L;优化后的复合镀层表面平整,晶粒细小均匀,且金刚石粉体的质量分数为62.7%;与纯Ni镀层的晶粒相比,Ni-金刚石复合镀层的晶粒明显细化。

Abstract: The Ni-diamond composite electrodeposition was prepared by composite electroplating when diamond particles with a diameter of 40 μm were put into the solution of Ni electroplating. The effects of temperature, pH value of solution, concentration of Ni2+, cathode current density and concentration of diamond particles on the quality of Ni-diamond composite coatings were investigated by the cathodic potentiodynamic polarization, SEM and microhardness tester. The optimized technological conditions of Ni-diamond composite electrodeposition were obtained. The structure of optimized Ni-diamond composite coating was tested by XRD. The experimental results show that the optimized technological conditions are: NiSO4·6H2O, 132 g/L; NiCl2, 15 g/L; H3BO3, 30 g/L; temperature, (50±1) ℃; pH, 3-4; cathode current density, 4 A/dm2; concentration of diamond particles, 30 g/L. The results of SEM indicate that the surface of the Ni-diamond composite coating containing 62.7% diamond particles is neat, and small homogeneous grains are obtained. In comparison with pure Ni coating, the grains of the Ni-diamond composite coating are obviously refined.

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