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Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

In situ formation of layered double hydroxides (LDH) on metallic surfaces has recently been considered a promising approach for protective conversion surface treatments for Al and Mg alloys. In the case of Mg-based substrates, the formation of LDH on the metal surface is normally performed in autocl...

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Autores principales: Shulha, T. N., Serdechnova, M., Lamaka, S. V., Wieland, D. C. F., Lapko, K. N., Zheludkevich, M. L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6219525/
https://www.ncbi.nlm.nih.gov/pubmed/30401953
http://dx.doi.org/10.1038/s41598-018-34751-7
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author Shulha, T. N.
Serdechnova, M.
Lamaka, S. V.
Wieland, D. C. F.
Lapko, K. N.
Zheludkevich, M. L.
author_facet Shulha, T. N.
Serdechnova, M.
Lamaka, S. V.
Wieland, D. C. F.
Lapko, K. N.
Zheludkevich, M. L.
author_sort Shulha, T. N.
collection PubMed
description In situ formation of layered double hydroxides (LDH) on metallic surfaces has recently been considered a promising approach for protective conversion surface treatments for Al and Mg alloys. In the case of Mg-based substrates, the formation of LDH on the metal surface is normally performed in autoclave at high temperature (between 130 and 170 °C) and elevated pressure conditions. This hampers the industrial application of MgAl LDH to magnesium substrates. In this paper, the growth of MgAl LDH conversion coating directly on magnesium alloy AZ91 at ambient conditions (25 °C) or elevated temperatures is reported in carbonate free electrolyte for the first time. The direct LDH synthesis on Mg alloys is enabled by the presence of organic chelating agents (NTA and EDTA), which control the amount of free and/or hydroxyl bound Mg(2+) and Al(3+) in the solution. The application of the chelating agents help overcoming the typical technological limitations of direct LDH synthesis on Mg alloys. The selection of chelators and the optimization of the LDH treatment process are supported by the analysis of the thermodynamic chemical equilibria.
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spelling pubmed-62195252018-11-07 Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy Shulha, T. N. Serdechnova, M. Lamaka, S. V. Wieland, D. C. F. Lapko, K. N. Zheludkevich, M. L. Sci Rep Article In situ formation of layered double hydroxides (LDH) on metallic surfaces has recently been considered a promising approach for protective conversion surface treatments for Al and Mg alloys. In the case of Mg-based substrates, the formation of LDH on the metal surface is normally performed in autoclave at high temperature (between 130 and 170 °C) and elevated pressure conditions. This hampers the industrial application of MgAl LDH to magnesium substrates. In this paper, the growth of MgAl LDH conversion coating directly on magnesium alloy AZ91 at ambient conditions (25 °C) or elevated temperatures is reported in carbonate free electrolyte for the first time. The direct LDH synthesis on Mg alloys is enabled by the presence of organic chelating agents (NTA and EDTA), which control the amount of free and/or hydroxyl bound Mg(2+) and Al(3+) in the solution. The application of the chelating agents help overcoming the typical technological limitations of direct LDH synthesis on Mg alloys. The selection of chelators and the optimization of the LDH treatment process are supported by the analysis of the thermodynamic chemical equilibria. Nature Publishing Group UK 2018-11-06 /pmc/articles/PMC6219525/ /pubmed/30401953 http://dx.doi.org/10.1038/s41598-018-34751-7 Text en © The Author(s) 2018 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Shulha, T. N.
Serdechnova, M.
Lamaka, S. V.
Wieland, D. C. F.
Lapko, K. N.
Zheludkevich, M. L.
Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title_full Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title_fullStr Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title_full_unstemmed Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title_short Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy
title_sort chelating agent-assisted in situ ldh growth on the surface of magnesium alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6219525/
https://www.ncbi.nlm.nih.gov/pubmed/30401953
http://dx.doi.org/10.1038/s41598-018-34751-7
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