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Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives

The optimal mechanical properties render magnesium widely used in industrial and biomedical applications. However, magnesium is highly reactive and unstable in aqueous solutions, which can be modulated to increase stability of reactive metals that include the use of alloys or by altering the surface...

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Autores principales: Echeverry-Rendon, Monica, Duque, Valentina, Quintero, David, Robledo, Sara M, Harmsen, Martin C, Echeverria, Felix
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6247453/
https://www.ncbi.nlm.nih.gov/pubmed/30444445
http://dx.doi.org/10.1177/0885328218809911
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author Echeverry-Rendon, Monica
Duque, Valentina
Quintero, David
Robledo, Sara M
Harmsen, Martin C
Echeverria, Felix
author_facet Echeverry-Rendon, Monica
Duque, Valentina
Quintero, David
Robledo, Sara M
Harmsen, Martin C
Echeverria, Felix
author_sort Echeverry-Rendon, Monica
collection PubMed
description The optimal mechanical properties render magnesium widely used in industrial and biomedical applications. However, magnesium is highly reactive and unstable in aqueous solutions, which can be modulated to increase stability of reactive metals that include the use of alloys or by altering the surface with coatings. Plasma electrolytic oxidation is an efficient and tuneable method to apply a surface coating. By varying the plasma electrolytic oxidation parameters voltage, current density, time and (additives in the) electrolytic solution, the morphology, composition and surface energy of surface coatings are set. In the present study, we evaluated the influence on surface coatings of two solute additives, i.e. hexamethylenetetramine and mannitol, to base solutes silicate and potassium hydroxide. Results from in vitro studies in NaCl demonstrated an improvement in the corrosion resistance. In addition, coatings were obtained by a two-step anodization procedure, firstly anodizing in an electrolyte solution containing sodium fluoride and secondly in an electrolyte solution with hexamethylenetetramine and mannitol, respectively. Results showed that the first layer acts as a protective layer which improves the corrosion resistance in comparison with the samples with a single anodizing step. In conclusion, these coatings are promising candidates to be used in biomedical applications in particular because the components are non-toxic for the body and the rate of degradation of the surface coating is lower than that of pure magnesium.
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spelling pubmed-62474532018-12-17 Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives Echeverry-Rendon, Monica Duque, Valentina Quintero, David Robledo, Sara M Harmsen, Martin C Echeverria, Felix J Biomater Appl Functional Biomaterials Surfaces The optimal mechanical properties render magnesium widely used in industrial and biomedical applications. However, magnesium is highly reactive and unstable in aqueous solutions, which can be modulated to increase stability of reactive metals that include the use of alloys or by altering the surface with coatings. Plasma electrolytic oxidation is an efficient and tuneable method to apply a surface coating. By varying the plasma electrolytic oxidation parameters voltage, current density, time and (additives in the) electrolytic solution, the morphology, composition and surface energy of surface coatings are set. In the present study, we evaluated the influence on surface coatings of two solute additives, i.e. hexamethylenetetramine and mannitol, to base solutes silicate and potassium hydroxide. Results from in vitro studies in NaCl demonstrated an improvement in the corrosion resistance. In addition, coatings were obtained by a two-step anodization procedure, firstly anodizing in an electrolyte solution containing sodium fluoride and secondly in an electrolyte solution with hexamethylenetetramine and mannitol, respectively. Results showed that the first layer acts as a protective layer which improves the corrosion resistance in comparison with the samples with a single anodizing step. In conclusion, these coatings are promising candidates to be used in biomedical applications in particular because the components are non-toxic for the body and the rate of degradation of the surface coating is lower than that of pure magnesium. SAGE Publications 2018-11-16 2018-11 /pmc/articles/PMC6247453/ /pubmed/30444445 http://dx.doi.org/10.1177/0885328218809911 Text en © The Author(s) 2018 http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
spellingShingle Functional Biomaterials Surfaces
Echeverry-Rendon, Monica
Duque, Valentina
Quintero, David
Robledo, Sara M
Harmsen, Martin C
Echeverria, Felix
Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title_full Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title_fullStr Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title_full_unstemmed Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title_short Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
title_sort improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives
topic Functional Biomaterials Surfaces
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6247453/
https://www.ncbi.nlm.nih.gov/pubmed/30444445
http://dx.doi.org/10.1177/0885328218809911
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