脉冲电沉积Ni-WC/Co纳米复合镀层耐蚀性的研究
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摘要
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.
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.
引文
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[4] KODANDARAMA L,KRISHNA M,SHARMA S C.Development and characterization of electrocodeposited nickelbased composites coatings[J].Journal of materials engineering&performance,2012,21(1):105-113.
[5]张维丽,朱有兰,黎樵燊.电沉积Ni-WC复合镀层特性的研究[J].广东工业大学学报,2000,17(1):65-69.
[6]周细枝,周小平,胡心彬.电刷镀WCp/Ni复合镀层组织与磨损特性[J].热加工工艺,2006,35(12):26-28.
[7]王宝山,赵欣明,刘先黎,等.电刷镀含纳米WC粉复合镀层组织与性能研究[J].电刷镀技术,2003(2):16-18.
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