Abstract Experimental research on the modification of glycine to enhance the wear resistance of nickel-based diamond composite coatings was conducted in this paper. Ni-diamond composite coatings, fabricated from a plating bath, were modified by adding glycine with different contents through co-electrodeposition technology. The surface morphology, diamond content, surface roughness, nickel grain size and microhardness of the composite coatings were investigated by using scanning electron microscopy, energy dispersive spectroscopy, three-dimensional profiler, X-ray diffraction analysis and microhardness tester measurements, respectively. The tribological properties of the composite coatings were evaluated using a reciprocating ball-on-disk tester. The results revealed that the Ni-diamond composite coating with improved diamond content and optimal nickel grain size was modified by a glycine content of 10 g l−1, further increasing its microhardness by 66% to 580 HV. Simultaneously, the surface roughness was also decreased by glycine modification. Owing to the increased diamond content and the reduced surface roughness, the friction coefficient of the composite coating was effectively reduced by 33%. With increasing microhardness and decreasing friction coefficient, the wear rate of the composite coating was reduced by 53%, and the cutting volume was increased by 60%, thus significantly enhancing the wear resistance of the coatings.

中文翻译：

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通过甘氨酸改性提高镍金刚石复合涂层的耐磨性

摘要 对甘氨酸改性提高镍基金刚石复合涂层耐磨性进行了实验研究。镍-金刚石复合镀层由镀液制成，通过共电沉积技术加入不同含量的甘氨酸进行改性。采用扫描电子显微镜、能量色散谱、三维轮廓仪、X射线衍射分析和显微硬度计测量分别研究了复合涂层的表面形貌、金刚石含量、表面粗糙度、镍晶粒尺寸和显微硬度。使用往复式球盘测试仪评估复合涂层的摩擦学性能。结果表明，具有改进的金刚石含量和最佳镍晶粒尺寸的 Ni-金刚石复合涂层被 10 g l-1 的甘氨酸含量改性，其显微硬度进一步提高了 66% 至 580 HV。同时，甘氨酸改性也降低了表面粗糙度。由于金刚石含量的增加和表面粗糙度的降低，复合涂层的摩擦系数有效降低了33%。随着显微硬度的增加和摩擦系数的降低，复合涂层的磨损率降低了53%，切削量增加了60%，从而显着提高了涂层的耐磨性。甘氨酸改性也降低了表面粗糙度。由于金刚石含量的增加和表面粗糙度的降低，复合涂层的摩擦系数有效降低了33%。随着显微硬度的增加和摩擦系数的降低，复合涂层的磨损率降低了53%，切削量增加了60%，从而显着提高了涂层的耐磨性。甘氨酸改性也降低了表面粗糙度。由于金刚石含量的增加和表面粗糙度的降低，复合涂层的摩擦系数有效降低了33%。随着显微硬度的增加和摩擦系数的降低，复合涂层的磨损率降低了53%，切削量增加了60%，从而显着提高了涂层的耐磨性。