镍-钴/镍/镍-钴镀层的制备及电化学性能  

Electrodeposition of Nickel-Cobalt/Nickel/Nickel-Cobalt Multilayer Coatings and Evaluation of Their Corrosion Resistance

作　　者：王建兴[1] 黄少军[1] 唐伦圆[1] 惠建科[1] 周兆锋[1] 潘勇[2] 

机构地区：[1]湘潭大学材料与光电物理学院,湖南湘潭411105 [2]湘潭大学低维材料及其应用技术教育部重点实验室,湖南湘潭411105

出　　处：《材料保护》2012年第9期17-20,6-7,共4页Materials Protection

基　　金：湖南省教育厅产业化项目(09CY006);湖南省科技重大专项(2009FJ1002);国家自然科学基金(11002121)资助

摘　　要：采用直流和脉冲方法电沉积了镍-钴/镍/镍-钴多层镀层。通过SEM对镍-钴/镍/镍-钴镀层的微观结构进行了表征,采用Tafel曲线外推法、交流阻抗法、阳极极化曲线法等方法对镍-钴/镍/镍-钴镀层在0.1mol/L H2SO4和1%NaCl混合溶液及10%NaOH溶液中的耐腐蚀性能进行了表征。结果显示:镍-钴/镍/镍-钴镀层的表面致密均一;在0.1 mol/L H2SO4+1%NaCl溶液中的腐蚀电位最正,传质电阻最大达到1 642Ω·cm2;在10%NaOH中钝化区为542 mV,具有较好的钝化效果。Ni-Co/Ni/Ni-Co multilayer coatings were prepared by combining direct current electrodeposition with pulse electrodeposition.The microstructure of the coatings was analyzed with a scanning electron microscope.The corrosion resistance of as-deposited Ni-Co/Ni/Ni-Co multilayer coatings in the mixed solution of 0.1 mol/L H2SO4 and 1.0% NaCl and 10% NaOH solution was evaluated with Tafel curve extrapolation method,electrochemical impedance spectroscopy,and linear anode polarization method.Results show that as-deposited Ni-Co/Ni/Ni-Co multilayer coatings are compact and uniform,and they show the most positive corrosion potential and the highest charge-transfer resistance(1 642 Ω·cm2) in the mixed solution of H2SO4 and NaCl.Besides,as-deposited Ni-Co/Ni/Ni-Co multilayer coatings have a passivation range of 524 mV in alkaline solution,showing good passivation efficacy.

关 键 词：多层镀层 直流电沉积 脉冲电沉积 镍-钴合金 耐腐蚀性能 

分 类 号：TQ153.2[化学工程—电化学工业]