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  Growth behavior of initial product layer formed on Mg alloy surface induced by polyaniline

Luo, Y., Wang, X., Guo, W., & Rohwerder, M. (2015). Growth behavior of initial product layer formed on Mg alloy surface induced by polyaniline. Journal of the Electrochemical Society, 162(6), C294-C301. doi:10.1149/2.1101506jes.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-9DDD-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-9DDE-8
Genre: Journal Article

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 Creators:
Luo, Yizhong1, 2, 3, Author              
Wang, Xianhong2, Author              
Guo, Wei4, Author              
Rohwerder, Michael1, Author              
Affiliations:
1Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
2Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun, China, ou_persistent22              
3University of Chinese Academy of Sciences, Beijing, China, ou_persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Bi-layer structure; Dissolution precipitations; Growth mechanisms; Ion concentrations; Mg alloy surfaces; Polyanilines (PAni); Protective layers; Solid reactions
 Abstract: The quality of the interfacial protective layer induced by polyaniline (PANI) has been claimed to play a crucial role for the enhanced corrosion protection of Mg alloy, but its growth behavior is not well understood. Here some composition, structure and growth kinetics of the protective layer formed at the PANI-emeraldine base (EB) coating/AZ91D Mg alloy interface were investigated to explore the growth mechanism. Upon immersion in 0.5 M NaCl solution, the growing interface layer under EB coating exhibited a fast passivation rate and an increased corrosion resistance, which was largely influenced by ion concentration. XPS depth profiles showed that the EB-induced layer was a mixture of MgO and Mg(OH)2, in which no significant bi-layer structure existed and MgO was dominant throughout the bulk film. These observations suggest that the interaction between EB and Mg can promote the faster growth of a stable MgO-rich layer mixed with Mg(OH)2 probably by solid reaction. Meanwhile less hydration of MgO and dissolution-precipitation reaction occur, thus leading to less Mg(OH)2 in the outer layer. © The Author(s) 2015.

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Language(s): eng - English
 Dates: 2015
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1149/2.1101506jes
 Degree: -

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Title: Journal of the Electrochemical Society
  Abbreviation : J. Electrochem. Soc.
Source Genre: Journal
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Publ. Info: New York, NY, USA : Electrochemical Society
Pages: - Volume / Issue: 162 (6) Sequence Number: - Start / End Page: C294 - C301 Identifier: ISSN: 0013-4651
CoNE: /journals/resource/991042748197686