The unexpected role of benzotriazole in mitigating magnesium alloy corrosion: A nucleating agent for crystalline nanostructured magnesium hydroxide film

Wang, J, Ke, C, Pohl, K, Birbilis, N and Chen, X 2015, 'The unexpected role of benzotriazole in mitigating magnesium alloy corrosion: A nucleating agent for crystalline nanostructured magnesium hydroxide film', Journal of the Electrochemical Society, vol. 162, no. 8, pp. 403-411.


Document type: Journal Article
Collection: Journal Articles

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Title The unexpected role of benzotriazole in mitigating magnesium alloy corrosion: A nucleating agent for crystalline nanostructured magnesium hydroxide film
Author(s) Wang, J
Ke, C
Pohl, K
Birbilis, N
Chen, X
Year 2015
Journal name Journal of the Electrochemical Society
Volume number 162
Issue number 8
Start page 403
End page 411
Total pages 9
Publisher Electrochemical Society, Inc.
Abstract Benzotriazole (BTA), an effective corrosion inhibitor for Cu or Cu-containing Al alloys, was added to 0.1 M NaCl to study its potential role in suppressing corrosion of the commercial Mg alloy, AMlite. In particular, the impact of pH and BTA concentration was investigated, indicating that BTA was effective at restricting corrosion of AMlite in weakly alkaline NaCl solution, i.e. pH 10.0. The degree of the protection afforded was a function of BTA concentration. The best corrosion inhibition was found in the NaCl containing 15 g/L BTA, however, the mechanism of inhibition was not a classical function, nor related to the inhibition mechanism of BTA for Cu-bearing alloys. Instead it is posited that BTA− anions act as a nucleating agent to stimulate the formation of a dense and highly crystalline Mg(OH)2 surface film with a uniform nano-structure capable of passivating the Mg-alloy, in contrast to say, the insoluble Cu-BTA complex via Cu-N coordination bonds for Cu-alloys. The magnitude of this effect of BTA on Mg corrosion was not anticipated, but effective, with beneficial implications to utilization of Mg alloys as anode materials, where in such cases, when dissolution occurs, the anode can passivate with little change in its potential.
Subject Materials Engineering not elsewhere classified
DOI - identifier 10.1149/2.0781508jes
Copyright notice © Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
ISSN 0013-4651
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