GRK 2154 - Materials for Brain

GRK Colloquium talk by Prof. Dr. Andrej Atrens: Understanding Mg corrosion and biocorrosion

Materials Engineering Division, School of Mechanical & Mining Engineering, The University of Queensland, Brisbane, Australia

Jul 08, 2019 from 04:00 PM to 05:30 PM

TF, Aquarium

The first part of this talk reviews the main factors that control Mg corrosion immersed in aque-ous solutions: (i) crystallographic orientation, (ii) impurity concentration (particularly Fe), and the influence of heat treatment, (iii) second phases, (iv) corrosion product films on the alpha-phase. Measurement effects are also mentioned.

The second part deals with Mg alloys for biodegradable medical implants. Over the last dec-ade, Mg alloys have progressed from a laboratory concept to significant clinical successes. For this application, corrosion which is normally an unwanted feature of Mg alloys, becomes critical for success. It is vital to understand and control the corrosion rate. In vitro research has identified the following factors as the most important: (a) the inorganic ions like calcium, chlo-rides, bicarbonates, phosphates; and (b) the organic compounds including proteins, amino acids and vitamins. The best estimates for Mg corrosion rates (based on in vitro measure-ments) are larger than the corrosion rates measured in vivo. This suggests that the Mg corro-sion mechanism in vivo is not adequately characterized, or the in vivo environment is not equivalent to immersion in a solution as used in the in vitro experiments. In fact, recent exam-ination of specimens implanted subcutaneously into Sprague-Dawley rats indicated that the in vivo environment was not at all equivalent to immersion in a solution, but rather the envi-ronment could be better described as damp

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