纳米颗粒大小对Ni-P合金镀层性能的影响及镀层制备工艺参数优化  

Effect of Nanoparticle Size on Properties of Ni-P Alloy Coating and Optimization of Parameters

作　　者：徐伟腾 康敏[1,2] 郭静 杜晓霞 解世禄[1] 刘全祥 

机构地区：[1]南京农业大学工学院,江苏南京210031 [2]南京农业大学灌云现代农业装备研究院,江苏灌云222200

出　　处：《材料保护》2017年第10期39-43,56,共6页Materials Protection

基　　金：国家大学生创新创业训练计划项目(201610307094)资助

摘　　要：为了提高农业刀具的使用寿命,在65Mn钢试件基体表面上,采用电沉积技术制备Ni-P-BN(h)纳米复合镀层,研究不同直径大小的BN(h)颗粒对镀层显微组织、硬度及摩擦磨损性能的影响;并通过正交试验,确定制备复合镀层的最优工艺参数。结果表明:随着BN(h)颗粒直径的增大,复合镀层有晶化的趋势;镀液中加入直径100 nm的BN(h)颗粒所制备的镀层表面胞体均匀致密、硬度最大、耐磨损性能最好;镀层形成过程中,纳米颗粒相互碰撞几率增大,导致晶核分布不均,影响表面质量并且减小耐磨损性能;制备Ni-P-BN(h)纳米复合镀层最优工艺参数为电流密度4.308 A/dm^2,BN(h)浓度15.00 g/L,施镀温度60℃,施镀时间3 h,所得硬度和磨损量分别为621.664 HV_(2N),2.665 8×10^(-3)mm^3,相较于65Mn基体硬度提升了1.2倍,磨损量降低86.5%。In order to improve the service life of agricultural tools, Ni-P-BN（h） nanocomposite coatings were prepared by electrodeposition on the surthce of 65Mn steel specimen, and the influence of BN particles with different diameters on the phase structure, hardness and tribological properties of coating was investigated. The orthogonal experiments were used to optimize the process parameters for preparing coatings. Results showed that with the increase of diameters of BN （h） particles, the composite coating presented crystallization trend. When BN （h） particles with a diameter of 100 nm were added into the plating solution, the prepared coating possessed uniform and dense surface cell body, the largest hardness and the best friction and wear resistance. During the formation process of coating, the probability of collision of the nanoparticles increased, which caused the uneven distribution of the nuclei, affected the surface quality and reduced the wear resistance. The orthogonal experiments presented that the optimal process parameters for preparing Ni-P- BN（h） nanocomposite coating were as follows： current density 4.308 A/dm2, BN（h） concentration 15.00 g/L, plating temperature 60℃ and plating time 3 h. The prepared coating had hardness of 621.664 HV2N and wear loss of 2.665 8×10-3 mm3. Furthermore, compared with the hardness of 65Mn substrate, the hardness of the coating was improved by 1.2 times, and the wear loss decreased by 86.5 %.

关 键 词：电沉积 65MN钢 正交试验 Ni-P-BN(h)纳米复合镀层 耐磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]