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

  • 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.

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Metadaten
Author:Wolf-Dieter Müller, Helga Hornberger
DOI:https://doi.org/10.3390/ijms150711456
Parent Title (English):International Journal of Molecular Science
Document Type:Article
Language:English
Year of first Publication:2014
Release Date:2020/06/18
Tag:corrosion; magnesium; magnesium alloys; magnesium hydride
Volume:15
First Page:11456
Last Page:11472
Institutes:Fakultät Maschinenbau
Labor Biomaterialien - BMA
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Publication:Externe Publikationen
OpenAccess Publikationsweg:Erstveröffentlichungen