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采用化学镀的方法在机械液压杆表面制备出Ni-Mo-P-Si_3N_4镀层,研究了pH值和Si_3N_4添加量对表面镀层沉积速率和镀层中Si_3N_4体积分数的影响,并对镀层表面形貌进行了观察,对比分析了不同镀层的摩擦磨损性能。结果表明,机械液压杆表面镀层的沉积速率在pH值为7.5时达到最大值;随着镀液中Si_3N_4的添加量的提高,机械液压杆表面镀层中的Si_3N_4体积分数呈现先增加而后降低的趋势,而表面镀层的沉积速率总体呈现逐渐降低的趋势;随着化学镀液中Si_3N_4体积分数的增加,机械液压杆表面镀层的平均摩擦系数呈现先增加而后降低的趋势,而磨痕宽度呈现逐渐降低的趋势。
The electroless plating method was used to prepare Ni-Mo-P-Si_3N_4 coating on the surface of the mechanical hydraulic rod. The effects of pH value and Si_3N_4 loading on the deposition rate and the volume fraction of Si_3N_4 in the coating were studied. Observed and compared the friction and wear properties of different coatings. The results show that the deposition rate of the coating on the surface of the mechanical hydraulic rod reaches its maximum at a pH value of 7.5. With the increase of the amount of Si 3 N 4 in the plating solution, the volume fraction of Si 3 N 4 in the surface coating increases first and then decreases , While the deposition rate of the surface coating showed a decreasing trend overall. With the increase of Si_3N_4 volume fraction in the electroless plating bath, the average friction coefficient of the surface coating increased first and then decreased, while the width of the wear scar gradually decreased the trend of.