硫酸高铈对换向脉冲电沉积镍钴合金的影响  

Influence of ceric sulfate on reverse-pulse electrodeposited nickel–copper alloy

作　　者：张飞霞[1] 葛文[1] 许明星[1] 牛香全 

机构地区：[1]中国地质大学(武汉)材料与化学学院,湖北武汉430074

出　　处：《电镀与涂饰》2014年第17期728-731,共4页Electroplating & Finishing

摘　　要：在电解液中添加不同浓度的硫酸高铈,采用换向脉冲电沉积法制备了Ni–Co合金镀层。通过X射线衍射、极化曲线和中性盐雾试验研究了硫酸高铈浓度对Ni–Co合金镀层晶粒尺寸及耐蚀性能的影响,采用扫描电镜对含与不含硫酸高铈得到的Ni–Co合金镀层盐雾试验前后的表面形貌进行了观察,并用能谱分析仪测试了盐雾腐蚀后镀层的组成。结果表明,所制备的合金镀层均为面心立方(fcc)结构,主要的晶面取向为(111)和(200)面;硫酸高铈的加入粗化了Ni–Co合金镀层的晶粒,使镀层的自腐蚀电位负移,自腐蚀电流增大,耐蚀性降低。Ni-Co alloy deposits were prepared by pulse- reverse electrodeposition with the addition of different concentrations of ceric sulfate in the electrolyte. The effect of concentration of ceric sulfate on the grain size and corrosion resistance of the Ni-Co alloy deposit was studied by X-ray diffraction （XRD）, polarization curve measurement, and neutral salt spray test. The surface morphologies of the obtained Ni-Co alloy deposits with and without ceric sulfate before and after salt spray test were observed by scanning electron microscopy, and the composition of the deposits after salt spray corrosion were measured by energy-disperse Spectroscopy （EDS）. The results indicated that the alloy deposits prepared are all face-centered cubic （fcc） structure, with （111） and （200） planes oriented. The addition of ceric sulfate makes the grain size of Ni-Co alloy deposit larger, resulting in a negative shift of corrosion potential and an increase of corrosion current density, reducing the corrosion resistance of Ni-Co deposit.

关 键 词：镍钴合金 换向脉冲电沉积 硫酸高铈 耐蚀性 

分 类 号：TQ153.2[化学工程—电化学工业]