Effect of Microstructures on Corrosion Behavior of Nickel Coatings: (I) Abnormal Grain Size Effect on Corrosion Behavior

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• 作者：Guozhe Meng¹ ; ² ; ^{mengguozhe@hrbeu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yang Li¹ ; Yawei Shao¹ ; ² ; Tao Zhang¹ ; ² ; Yanqiu Wang¹ ; Fuhui Wang¹ ; ² ; Xuequn Cheng³ ; Chaofang Dong³ ; Xiaogang Li² ; ³
• 关键词：Nanocrystalline ; Pulse jet electrodeposition ; Corrosion ; Grain size ; Growth twins
• 刊名：Journal of Materials Science & Technology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：31
• 期：12
• 页码：1186-1192
• 全文大小：1994 K

文摘

Nickel coatings with different microstructures were synthesized by pulse jet electrodeposition technique. Their morphology and microstructure were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The corrosion property of the coatings was studied by using polarization, electrochemical impedance spectroscopy (EIS), potential of zero free charge (PZFC) measurements and Mott–Schottky (M–S) relationship. The results showed that the coating with grain size of 50 nm possessed higher corrosion resistance than that with grain size of 10 nm. This abnormal behavior may be related to the existence of nanoscale twins in the coatings and the lower concentration of acceptor in the passive films.