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利用直流电沉积方法将WC-Co双纳米颗粒和Ni复合镀于黄铜基体,采用XRD和SEM表征复合镀层相组成和表面形貌,用显微硬度计测定其硬度并用电化学方法评估镀层的耐蚀性.结果表明,与纯Ni镀层相比,纳米复合镀层中Ni平均晶粒尺寸略有降低,约为18 nm;显微硬度提高58%,约为HV 500.在3.5%NaCl溶液中纯Ni镀层自腐蚀电流密度和自腐蚀电位分别为1.467μA/cm2和-0.179 V,纳米复合镀层则分别为8.369μA/cm2和-0.265 V.Ni/WC-Co纳米复合镀层的硬度显著提高,但其耐蚀性降低.
The DC-electrodeposition method was used to composite WC-Co dual nanoparticles and Ni into brass matrix. The phase composition and surface morphology of the composite coatings were characterized by XRD and SEM. The hardness of the composites was measured by microhardness tester and evaluated by electrochemical method Corrosion resistance.The results show that compared with the pure Ni coating, the nano-composite coating Ni average grain size slightly lower, about 18 nm; microhardness increased by 58%, about HV 500. In 3.5% NaCl solution The self-corrosion current density and self-corrosion potential of pure Ni coating were 1.467μA / cm2 and -0.179V respectively, while that of nano-composite coatings were 8.369μA / cm2 and -0.265 V. The hardness of Ni / WC-Co nanocomposite coatings was significantly increased, However, its corrosion resistance is reduced.