Grain size effects on the corrosion behavior of Ni50.5Ti49.5 and Ni45.6Ti49.3Al5.1 films
Grain size effects on the corrosion behavior of Ni50.5Ti49.5 and Ni45.6Ti49.3Al5.1 films
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DOI：
10.1016/j.jelechem.2008.02.020
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发表时间：
2008-07-01
影响因子：
4.5
通讯作者：
Duh, J. Gong
中科院分区：
文献类型：
--
作者：
Liu, K. Ting;Duh, J. Gong
本文采用不同的退火温度制备了不同晶粒尺寸的Ni50.5Ti49.5和Ni45.6Ti49.3Al5.1薄膜。采用动电位极化曲线、电化学阻抗谱（EIS）、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）等测试手段，研究了小晶粒Ni50. 5Ti49. 5和Ni45. 6Ti49. 3Al5. 1薄膜在氯离子腐蚀介质中的电化学腐蚀行为。结果表明，在含氯化物的电解液中，晶粒尺寸较小的Ni50.5Ti49.5和Ni45.6Ti49.3Al5.1膜层的耐蚀性较粗晶粒膜层有明显提高，这是由于晶粒尺寸较小的组织中晶界密度较高，能迅速形成高贵的保护性钝化膜。耐蚀性的提高可能与精细结构材料中晶界的高分数密度的积极作用有关。(c)2008 Elsevier B.V.保留所有权利。
In this paper, the various grain sizes of Ni50.5Ti49.5 and Ni45.6Ti49.3Al5.1 film were prepared by various annealing temperatures. The electrochemical corrosion behavior of smaller grain size Ni50.5Ti49.5 and Ni45.6Ti49.3Al5.1 films compared with coarse-grained coatings in chloride-containing corrosion media were characterized using potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results showed that in the chloride-containing electrolyte, the smaller grain size Ni50.5Ti49.5 and Ni45.6Ti49.3Al5.1 exhibited improved corrosion resistance when compared with coarse grain films, which is attributed to the higher grain boundary density in fine structure to quickly form a noble and protective passive film. The enhancement of corrosion resistance can be related to the positive effect of the high fraction density of grain boundary in fine structure materials. (c) 2008 Elsevier B.V. All rights reserved.