Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 76, Issue -, Pages 6-9Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2017.01.004
Keywords
Scanning electrochemical microscopy; Magnesium alloy; Praseodymium oxide; Passivation; Conversion coating; Self-healing
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Funding
- Australian Research Council Centre of Excellence Scheme [CE0561616, CE140100012]
- Linkage Grant with Boston Scientific [LP0990621]
- Australian Research Council [LP0990621] Funding Source: Australian Research Council
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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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