钨酸钠和次磷酸钠浓度对脉冲电镀CeO2-SiO2/Ni-W-P纳米复合薄膜组织及性能的影响

通过Ni、W、P与CeO₂和SiO₂纳米颗粒的脉冲共沉积，在碳钢表面制备了CeO₂-SiO₂/Ni-W-P纳米复合薄膜，主要研究了电解液中钨酸钠和次磷酸钠浓度对纳米复合薄膜组织及性能的影响，采用化学组成、沉积速率、显微硬度和表面形貌进行表征。结果表明，当钨酸钠和次磷酸钠浓度分别为100和4 g/L时，纳米复合薄膜的沉积速率和显微硬度较高，分别为25.03 μm/h和HV649。增加钨酸钠浓度，纳米复合薄膜晶粒得到细化。当钨酸钠浓度提高到160 g/L时，基质金属晶粒轮廓清晰，细小而均匀，呈规则的圆球型，CeO₂、SiO₂纳米颗粒均匀弥散分布在Ni-W-P基质金属中。次磷酸钠浓度的增加对纳米复合薄膜的表面形貌影响较小，但会明显降低显微硬度。

Influence of Na2 WO4 and NaH2 PO2 concentrations on microstructures and properties of CeO2-SiO2/Ni-W-P nano-composite films prepared by pulse plating

CeO2-SiO2/Ni-W-P nano-composite films were prepared on the carbon steel surface by pulse co-deposition of Ni，W，P，nano-CeO2 and nano-SiO2 particles，the influence of Na2WO4 and NaH2PO2 concentrations in electrolyte on microstructures and properties of the nano-composite films was researched，and the characteristics were assessed by chemical composition,  deposition rate, microhardness and surface morphologies. The results show that when the Na2WO4 and NaH2PO2 concentrations in electrolyte are controlled at 100 and 4 g/L respectively,  the deposition rate of 25.03 μm/h and the microhardness of HV649 of the nano-composite films are obtained. The increase of the Na2WO4 concentration leads to refinement in the grain structure of the nano-composite films. When  improved at 160 g/L，the nano-composite films possess a clear outline of the spherical matrix metal crystallite，fine crystal size,  compact microstructure and uniform and dispersive distribution of nano-CeO2 and nano-SiO2 particles within the Ni-W-P matrix metal. The increase of the NaH2PO2 concentration in electrolyte has a little effect on the surface morphologies，but it results in a microhardness decrease of the nano-composite films.