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Int. J. Mol. Sci. 2014, 15(7), 11456-11472;

The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

Biomaterial Research CC3, Dental School Charité Universitaetsmedizin Berlin, Assmannshauserstrasse 4-6, Berlin 14197, Germany
Department Material Science and Technology EB13, Technische Universität Berlin, Strasse des 17. Juni 13, Berlin 10623, Germany
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 9 April 2014 / Revised: 13 June 2014 / Accepted: 20 June 2014 / Published: 26 June 2014
(This article belongs to the Special Issue Biodegradable Magnesium Alloys and Implants)
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Mg and Mg alloys are becoming more and more of interest for several applications. In the case of biomaterial applications, a special interest exists due to the fact that a predictable degradation should be given. Various investigations were made to characterize and predict the corrosion behavior in vitro and in vivo. Mostly, the simple oxidation of Mg to Mg2+ ions connected with adequate hydrogen development is assumed, and the negative difference effect (NDE) is attributed to various mechanisms and electrochemical results. The aim of this paper is to compare the different views on the corrosion pathway of Mg or Mg alloys and to present a neglected pathway based on thermodynamic data as a guideline for possible reactions combined with experimental observations of a delay of visible hydrogen evolution during cyclic voltammetry. Various reaction pathways are considered and discussed to explain these results, like the stability of the Mg+ intermediate state, the stability of MgH2 and the role of hydrogen overpotential. Finally, the impact of MgH2 formation is shown as an appropriate base for the prediction of the degradation behavior and calculation of the corrosion rate of Mg and Mg alloys. View Full-Text
Keywords: magnesium; magnesium alloys; magnesium hydride; corrosion; degradation magnesium; magnesium alloys; magnesium hydride; corrosion; degradation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Mueller, W.-D.; Hornberger, H. The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys. Int. J. Mol. Sci. 2014, 15, 11456-11472.

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