Grain size effect in corrosion behavior of electrodeposited nanocrystalline Ni coatings in alkaline solution
Grain size effect in corrosion behavior of electrodeposited nanocrystalline Ni coatings in alkaline solution
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DOI：
10.1016/j.scriptamat.2006.04.009
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发表时间：
2006-10-01
影响因子：
6
通讯作者：
Xu, Tao
中科院分区：
文献类型：
--
作者：
Wang, Liping;Zhang, Junyan;Xu, Tao
采用动电位极化测试和电化学阻抗谱技术表征了晶粒尺寸减小对脉冲电沉积纳米晶Ni电化学腐蚀行为的影响；采用x射线光电子能谱法对电化学测量结果进行了验证，并提出了机理。随着晶粒尺寸由微晶变为纳米晶，Ni涂层在碱性溶液中的耐蚀性显著提高。NC Ni具有较高的耐蚀性可能是由于连续Ni(OH)2钝化膜的形成速度比粗晶Ni涂层快。(c) 2006材料学报Elsevier Ltd.出版。版权所有。
Effects of grain size reduction on the electrochemical corrosion behavior of nanocrystalline Ni produced by pulse electrodeposition were characterized using potentiodynamic polarization testing and electrochemical impedance spectroscopy; X-ray photoelectron spectroscopy were used to confirm the electrochemical measurements and the suggested mechanisms. The corrosion resistance of Ni coatings in alkaline solutions considerably increased as the grain size decreased from microcrystalline to nanocrystalline. The higher corrosion resistance of NC Ni may be due to the more rapid formation of continuous Ni(OH)2 passive films compared with coarse-grained Ni coatings. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.