A simple model for long‐time degradation of magnesium under physiological conditions. Issue 2 (25th April 2017)

• Record Type: Journal Article
• Authors: Dahms, M.; Höche, D.; Ahmad Agha, N.; Feyerabend, F.; Willumeit‐Römer, R.
• Is Part Of: Materials and corrosion. Volume 69:Issue 2(2018)
• Page Start: 191
• Page End: 196
• Publication Date: 2017-04-25
• Subjects: mass transport -- materials failure -- numerical differentiation; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.201709461
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract : The present work applies the law of mass conservation toward an analytical model describing the long‐term degradation of Mg‐0.3Ca implant material in defined physiological electrolyte environments. The model takes into account surface conversion and degradation product deposition related changes of degradation rates by introducing an effective layer thickness. The analytical nature of the approach does not consider detailed chemical and electrochemical process. Thus, it simply declares an effective damping term. In this way it can be applied easily for the prediction of materials failure in the named environments. Restrictions of the approach will be discussed as well since validity relates to a number of aspects. Abstract : Magnesium degradation under physiological conditions is a complex cascade of chemical and electrochemical processes. In order to reduce complexicity, a numerical degradation model was developed based on the law of mass conservation and introducing an effective degradation layer thickness. The model was experimentally validated and will make prediction of materials degradation and failure under these conditions possible.