稀土Ce含量对双脉冲电沉积Ni-Co合金层结构及耐蚀性的影响

发布时间：2018-01-21 18:09

本文关键词： Ni-Co合金双脉冲电沉积稀土Ce 耐蚀性晶粒尺寸　出处：《材料保护》2015年11期 　论文类型：期刊论文

【摘要】：目前将稀土用作电沉积Ni-Co合金添加剂时有关其对镀层耐蚀性的影响报道较少。通过X射线衍射、极化曲线和中性盐雾试验研究了稀土Ce对双脉冲电沉积纳米Ni-Co合金层晶粒尺寸及耐蚀性的影响,采用扫描电镜对有无稀土Ce的Ni-Co合金镀层盐雾腐蚀前后的表面形貌进行了观察。结果表明:无论是否添加稀土Ce,Ni-Co合金镀层均为面心立方结构,主要的晶面取向为(111)和(200)面;稀土Ce含量在一定范围时,细化了Ni-Co合金镀层的晶粒,镀层的自腐蚀电位正移,自腐蚀电流减小,耐蚀性增加,且加入量为0.6g/L时晶粒尺寸最小。
[Abstract]:At present, there are few reports on the effect of rare earth elements on the corrosion resistance of electrodeposition of Ni-Co alloy by X-ray diffraction. The effect of rare earth ce on the grain size and corrosion resistance of nano-sized Ni-Co alloy prepared by double-pulse electrodeposition was investigated by polarization curve and neutral salt spray test. The surface morphology of Ni-Co alloy coating with or without rare earth ce was observed by scanning electron microscope before and after salt spray corrosion. The coating of Ni-Co alloy all have face-centered cubic structure, and the main orientation of crystal plane is (111) and (200) faces. When the rare earth ce content is in a certain range, the grain size of the Ni-Co alloy coating is refined, the self-corrosion potential of the coating moves positively, the self-corrosion current decreases and the corrosion resistance increases. The grain size is the smallest when the addition amount is 0.6 g / L.
【作者单位】：中国地质大学(武汉)材料与化学学院;
【分类号】：TG174.4
【正文快照】： 0前言Ni-Co合金镀层具有良好的耐磨、耐蚀性和较高的硬度,可用作装饰性镀层、耐磨镀层和磁性镀层,在电铸方面也有广泛应用。采用电沉积法可制得性能较好的Ni-Co合金镀层。双脉冲电沉积Ni-Co合金具有许多优点:在反向电流的作用下能溶解电沉积产生的毛刺,整平镀层;消除浓差极化,

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