Abstract Boron carbide (B4C) particles were embedded in nickel-tungsten (Ni-W) coatings by pulse current electrodeposition technique. Physical properties of the composite coatings were studied by XRD, SEM, EDS and Vickers micro-hardness instrument. Corrosion protection of the deposited films was investigated utilizing potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS). Results exhibited that the addition of B4C nanoparticles into the Ni-W alloy can significantly improve the surface morphology and the micro-hardness of the composite coatings. The corrosion resistance of Ni-W-B4C nanocomposite is much better than Ni-W alloy deposit, especially when the concentration of B4C nanoparticles is 2 g/L in plating bath, the obtained Ni-W-B4C composite coating has the best surface morphology, the highest micro-hardness and the excellent corrosion resistance.

中文翻译：

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Ni-WB 4 C复合涂层的制备及其显微硬度和耐蚀性能评价

摘要 采用脉冲电流电沉积技术将碳化硼 (B4C) 颗粒嵌入镍钨 (Ni-W) 涂层中。采用XRD、SEM、EDS和维氏显微硬度计对复合涂层的物理性能进行了研究。利用动电位极化和电化学阻抗谱 (EIS) 研究了沉积膜的腐蚀保护。结果表明，在 Ni-W 合金中加入 B4C 纳米颗粒可以显着改善复合涂层的表面形貌和显微硬度。Ni-W-B4C纳米复合镀层的耐腐蚀性能远优于Ni-W合金镀层，尤其是镀液中B4C纳米颗粒浓度为2g/L时，得到的Ni-W-B4C复合镀层表面形貌最好,