【作者】 任义磊；

【导师】 姚冠新；

【作者基本信息】 江苏大学 ， 材料学， 2003， 硕士

【摘要】 通过金属电沉积的方法，将一种或数种不溶性的固体颗粒，均匀地夹杂到金属镀层中所形成的特殊镀层称作复合镀层。它是现代表面技术的重要组成部分，在工程技术中获得了广泛的应用。 电沉积镍基复合镀层同时兼有镍基和共沉积微粒各自的优异性能，尤其适用于特殊工况条件下的重要零部件的表面强化，因而正引起当今材料表面处理工程界的浓厚兴趣。 鉴于材料保护的重要性和电沉积复合电镀层在此方面所显示出的巨大潜力和优势，本文尝试在碳钢试样上沉积出具有优异耐磨和减摩性能的Ni-Al₂O₃-Mos₂复合镀层。通过相关活性剂的活化作用，在Watts镀镍液中添加Al₂O₃和MoS₂微粒，采用机械搅拌，使微粒充分悬浮，从而成功地制备出含有硬质粒子Al₂O₃和软质粒子MoS₂的Ni-Al₂O₃-MoS₂复合镀层。通过正交试验，找到了制备镀层的最佳工艺参数和颗粒的添加量。研究结果表明：Ni-Al₂O₃-MoS₂复合镀层具有良好的耐磨性和减摩性，并且耐腐蚀性、抗氧化性好。耐磨性优于纯镍镀层和45^#淬火钢；减摩性比铜合金、铝合金更理想。 同时，分析讨论了工艺参数对复合镀层性能、成分的影响。 借助于JXA-840A型电子探针，大型金相显微镜等先进测试设备，进行了组织、成分分析，研究了Ni-Al₂O₃-MoS₂复合镀层的磨损机制和耐磨减摩机理。初步探讨了非导电性颗粒的共沉积原理。更多还原

【Abstract】 With the method of metal electroplating, a special coat that evenly mixes one or several infusible solid grains to the electroplating coating is called composite coating. It becomes one of the modern surface techniques with great importance and has a wide application in engineeringWith the combination of excellent properties of the nickel matrix and those of particles incorporated, electroplating nickel composite coatings are especially appropriate for protecting some key components from special circumstances. Therefore this field of research is receiving intensive interests of toady s surface finishing and engineering communities.In consideration of the significance of materials protection as well as the great advantages and potentials that electroplating composite coatings demonstrate in this field, this paper attempts to deposit a film of composite coating with high quality of wear resistance or friction reducing on carbureted steel substrates by electroplating. With addition of Al2O3 particles and MoS2 particles to Watts bath, adopting machine blend and making the particles full suspend in the bath, the composite coating containing Al2O3 particles of wear resistance and MoS2 particles of friction reducing has been successfully prepared. The optimum parameters were established by the means of perpendicular tests. The experiment results showed that the composite coating has better wearing capacity of wear resistance and friction reducing, and resistance to corrosion and oxidation, the capacity of wear resistance is better than pure nickel coating and 45 hardened -steel, the capacity of friction reducing is more agreeable than copper and aluminumThe influence of plating parameters on the capabilities and composition were analyzed.With the help of SEM JXA-840A and advanced metallographical microscope, wear mechanism of theNi-Al2O3-MoS2 composite coating were studied, and the sediment principle of no conducting particles was primitively discussed.更多还原