脉冲电沉积Ni-WC/Co纳米复合镀层耐蚀性的研究

Research on Corrosion Resistance of Ni-WC/Co Nanocomposite Coating Prepared by Pulse Electrodeposition

利用脉冲电沉积方法在20R钢基体上制备了Ni-WC/Co纳米复合镀层。分别采用SEM、EDS和XRD对Ni-WC/Co纳米复合镀层的表面形貌、成分和结构进行了测试,并对比了20R钢基体与Ni-WC/Co纳米复合镀层的耐蚀性。结果表明:纳米微粒在基体中弥散分布,晶粒尺寸约为40nm。Ni-WC/Co纳米复合镀层的自腐蚀电位为-349.37mV,较20R钢基体的自腐蚀电位提高了127.75mV;自腐蚀电流密度为4.206μA/cm^2,约为20R钢基体自腐蚀电流密度的28.2%。另外,Ni-WC/Co纳米复合镀层在10%的H_2SO_4溶液中表现出比20R钢更好的耐蚀性。

Ni-WC/Co nanocomposite coating was prepared on 20 R steel substrate by pulse electrodeposition. The surface morphology, composition and structure of Ni-WC/Co nanocomposite coating were characterized by SEM,EDS and XRD,and the corrosion resistance of 20 R steel substrate and Ni-WC/Co nanocomposite coating was investigated.The results showed that nanoparticles were dispersed in the substrate and the grain size was about 40 nm.The self-potential of Ni-WC/Co nanocomposite coating was-349.37 mV,which was 127.75 mV higher than that of 20 Rsteel substrate,and the self-current density of Ni-WC/Co nanocomposite coating was 4.206μA/cm2,which was about 28.2% of that of 20 Rsteel substrate.Moreover,Ni-WC/Co nanocomposite coating showed better corrosion resistance than 20 Rsteel substrate in10% H2SO4 solution.