纳米颗粒对镍刷镀层组织及性能的影响

应用纳米复合电刷镀技术制备了纳米氧化铝/镍复合镀层,采用透射电镜、XPS等现代分析技术和性能评价手段研究了纳米颗粒对镍刷镀层组织和性能的影响.结果表明:纳米颗粒在复合刷镀层中弥散分布、粒度均匀,与基质镍金属以化学键结合;纳米颗粒增加了基质金属的成核率,细化了镀层组织,显著提高了刷镀层的硬度和耐磨性.与镍金属刷镀层相比,复合刷镀层硬度和耐磨性分别提高0.5倍和1.5倍以上.复合刷镀层的组织特征合理地解释了纳米颗粒对其性能影响的机理.

Effects of nano-particles on microstructure and properties of electrobrush plated nickel coating

Nanoparticle reinforced nickel matrix composite (n-Al_2O_3/Ni) coatings were fabricated by electrobrush plating technique. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) techniques were employed to study the effects of the nano-particle on microstructure and properties of n-Al_2O_3/Ni composite coatings. It is revealed that the nano-particles disperse in the coatings evenly and take chemical bonds to the matrix (metal nickel). In fact, nano-particles enhance inhomogeneous nucleation of matrix during the composite formation by electrobrush plating, and refine the microstructure of the composite coatings. Nano-particles can obviously improve hardness and wear resistance of the electronbrush plated metal coatings. Compared with the nickel metal coatings, the hardness and wear resistance of n-Al_2O_3/Ni composite coatings increase by 0.5 times and 1.5 times, respectively. Microstructure characteristics properly elucidate the effect and mechanism of nano-particle improving properties of the electrobrush plated coatings.