Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings
Bioactive Plasma Electrolytic Oxidation (PEO) coatings enriched in Ca, P and F were developed on Mg0.6Ca and Mg0.6Ca2Ag alloys with the aim to impede their fast degradation rate. Different characterization techniques (SEM, TEM, EDX, SKPFM, XRD) were used to analyze the surface characteristics and ch...
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doaj-8f4b58dff8804a1eb55573d4cb7f90ce2020-11-25T01:15:33ZengMDPI AGCoatings2079-64122019-06-019638310.3390/coatings9060383coatings9060383Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation CoatingsLara Moreno0Marta Mohedano1Beatriz Mingo2Raul Arrabal3Endzhe Matykina4Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainDepartamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainSchool of Materials, The University of Manchester, Oxford Road, Manchester M13 9PL, UKDepartamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainDepartamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainBioactive Plasma Electrolytic Oxidation (PEO) coatings enriched in Ca, P and F were developed on Mg0.6Ca and Mg0.6Ca2Ag alloys with the aim to impede their fast degradation rate. Different characterization techniques (SEM, TEM, EDX, SKPFM, XRD) were used to analyze the surface characteristics and chemical composition of the bulk and/or coated materials. The corrosion behaviour was evaluated using hydrogen evolution measurements in Simulated Body Fluid (SBF) at 37 °C for up to 60 days of immersion. PEO-coated Mg0.6Ca showed a 2−3-fold improved corrosion resistance compared with the bulk alloy, which was more relevant to the initial 4 weeks of the degradation process. In the case of the Mg0.6Ag2Ag alloy, the obtained corrosion rates were very high for both non-coated and PEO-coated specimens, which would compromise their application as resorbable implants. The amount of F<sup>−</sup> ions released from PEO-coated Mg0.6Ca during 24 h of immersion in 0.9% NaCl was also measured due to the importance of F<sup>−</sup> in antibacterial processes, yielding 33.7 μg/cm<sup>2</sup>, which is well within the daily recommended limit of F<sup>−</sup> consumption.https://www.mdpi.com/2079-6412/9/6/383corrosionPEObiodegradable implants |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lara Moreno Marta Mohedano Beatriz Mingo Raul Arrabal Endzhe Matykina |
spellingShingle |
Lara Moreno Marta Mohedano Beatriz Mingo Raul Arrabal Endzhe Matykina Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings Coatings corrosion PEO biodegradable implants |
author_facet |
Lara Moreno Marta Mohedano Beatriz Mingo Raul Arrabal Endzhe Matykina |
author_sort |
Lara Moreno |
title |
Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings |
title_short |
Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings |
title_full |
Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings |
title_fullStr |
Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings |
title_full_unstemmed |
Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings |
title_sort |
degradation behaviour of mg0.6ca and mg0.6ca2ag alloys with bioactive plasma electrolytic oxidation coatings |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-06-01 |
description |
Bioactive Plasma Electrolytic Oxidation (PEO) coatings enriched in Ca, P and F were developed on Mg0.6Ca and Mg0.6Ca2Ag alloys with the aim to impede their fast degradation rate. Different characterization techniques (SEM, TEM, EDX, SKPFM, XRD) were used to analyze the surface characteristics and chemical composition of the bulk and/or coated materials. The corrosion behaviour was evaluated using hydrogen evolution measurements in Simulated Body Fluid (SBF) at 37 °C for up to 60 days of immersion. PEO-coated Mg0.6Ca showed a 2−3-fold improved corrosion resistance compared with the bulk alloy, which was more relevant to the initial 4 weeks of the degradation process. In the case of the Mg0.6Ag2Ag alloy, the obtained corrosion rates were very high for both non-coated and PEO-coated specimens, which would compromise their application as resorbable implants. The amount of F<sup>−</sup> ions released from PEO-coated Mg0.6Ca during 24 h of immersion in 0.9% NaCl was also measured due to the importance of F<sup>−</sup> in antibacterial processes, yielding 33.7 μg/cm<sup>2</sup>, which is well within the daily recommended limit of F<sup>−</sup> consumption. |
topic |
corrosion PEO biodegradable implants |
url |
https://www.mdpi.com/2079-6412/9/6/383 |
work_keys_str_mv |
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1725152588402262016 |