Self-healing characteristic of praseodymium conversion coating on AZNd Mg alloy studied by scanning electrochemical microscopy

被引：45
作者：
Jamali, Sina S. [1 ]
Moulton, Simon E. [4 ,5 ]
Tallman, Dennis E. [2 ]
Zhao, Yue [1 ]
Weber, Jan [3 ]
Wallace, Gordon G. [4 ]
机构：
[1] Univ Wollongong, ARC Res Hub Australian Steel Mfg, Wollongong, NSW, Australia
[2] North Dakota State Univ, Dept Coatings & Polymer Mat, Fargo, ND 58105 USA
[3] Boston Sci, G Martinolaan 50, Maastricht, Netherlands
[4] Univ Wollongong, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia
[5] Swinburne Univ Technol, Fac Sci Engn & Technol, Hawthorn, Vic 3122, Australia
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2017年 / 76卷
基金：
澳大利亚研究理事会;
关键词：
Scanning electrochemical microscopy; Magnesium alloy; Praseodymium oxide; Passivation; Conversion coating; Self-healing; CORROSION PROTECTION; MAGNESIUM ALLOY; CERIUM; FILMS; RESISTANCE; SECM;
D O I：
10.1016/j.elecom.2017.01.004
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Application of rare earth conversion coatings as a surface treatment for magnesium has been the subject of several studies revealing the potential to act as an effective passivating layer. Herein a mechanistic study is presented on the formation of a rare earth conversion layer based on Pr(NO3)(3) on AZ8OX magnesium alloy in simulated biological (buffered) solution. Scanning electrochemical microscopy (SECM) was used to investigate the insulating properties and degradation behaviour of the Pr conversion layer. The self-healing properties of the conversion layer in the presence of Pr3+ were also studied using SECM. Results revealed the self-healing characteristic of the Pr conversion film in the presence of active, Pr3+, species. The Pr conversion layer provided passivation in the short term by producing an electrochemically inert and insulating layer. SECM results in potentiometric mode elucidated the role of near surface pH in the formation of the conversion coating. (C) 2017 Elsevier B.V. All rights reserved.
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收藏
页码：6 / 9
页数：4
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