高i磷ni-p镀层的摩擦磨损性能.doc

文章编号：1671—7147(2006)05—0566-03 化学镀高磷Ni—P镀层的摩擦磨损性能 王政君， 赵永武 (江南大学机械工程学院，江苏无锡214122) 摘要：制备了一种高磷化学镀镍层并研究其表面形貌；讨论了其在不同温度热处理后的摩擦磨损性能，且与45钢进行了对比．结果表明，Ni—P镀层的耐磨性明显优于45钢，且经500℃ 热处理后硬度最高，耐磨性最好，可作为耐磨性镀层．在此基础上对化学镀Ni—P镀层的摩擦磨损机理进行了初步探讨，认为200℃热处理后主要表现为粘着磨损，500℃ 热处理后表现为磨料磨损和粘着磨损共存． 关键词：化学镀；高磷镀层；耐磨性中图分类号：TG174．44 文献标识码：A Study on the Frictional and W ear Properties of High_P Electroless Ni-P Coating WANG Zheng—j un。 ZHAO Yong—WU。(School of Mechanical Engineering，Southern Yangtze University，W uxi 214122，China)Abstract：The research on the frictional and wear properties of high—P electroless Ni—P coatings is presented．Firstly，the morphology of Ni—P coated surface are investigated by using scanning microscope．Then， the frictional coefficients and wear rates of Ni—P coated 45 steel which experiences different heat—treatment temperatures are measured and compared with those of 45 steel without surface coating． The results strongly indicate that the wear resistance of Ni—Pcoated 45 steeliS much better than that of 45 steel without surface coating．The results also show that the highest hardness and the best wear resistance of Ni—P coated 45 steel are obtained when it is heat—treated at 500℃ ．Finally。the present research makes a preliminary exploration of the possible wear mechanisms of Ni—P coated steel samples． It iS found that adhesive wear iS the dominant wear mechanism of Ni—P coating heat—treated at 200℃ while both abrasive wear and adhesive wear coexist for Ni—P coating heat—treated at 500℃ ． Key words：electroless plating；high—P coating；wear resistance 化学镀Ni—P镀层是应用非常广泛的功能性镀层，它具有优异的性能且均镀能力强，根据含磷量不同性能及应用范围有所不同．高磷非晶态镀层由于具有很高的耐磨性，更优异的耐腐蚀性口。 和突出的非磁性能[4]，受到人们的广泛重视．目前对镀层的耐蚀性和非磁性等物理性能研究较多，在提高镀层耐磨性研究上，人们对其工艺配方的改进以及对镀层性能的影响因素等方面进行了广泛的研究[5 ]，但对高磷镀层的摩擦磨损特性及其耐磨机理的研究很少．文中对高磷镀层不同热处理状态下的耐磨性进行了研究，且与调质处理45钢对比分析，并对镀层的磨损机理进行了初步探讨． 1 实验方法 1．1 高磷化学镀镍层的制备 1．1．1 实验材料实验用基材为 70mm×7mm的调质处理45钢，表面磨削并进行机械化学抛光． 1．1．2 工艺流程 抛光试样水洗一碱性除油一水洗一电解除油一水洗一弱酸浸蚀一水洗一化学镀镍磷一水洗一烘干． 1．2 镀层性能的测定 镀层厚度用TT260型无损测厚仪测量；硬度用MH一3型显微硬度计测定，载荷