Author： Cao J D Laws K J Birbilis N Ferry M
Publisher： Maney Publishing
ISSN： 1743-2782
Source： Corrosion Engineering, Science and Technology, Vol.47, Iss.5, 2012-08, pp. : 329-334
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Abstract
Bulk metallic glasses (BMGs) based on the Mg-Zn-Ca ternary system are considered as potential bioresorbable metals for orthopaedic applications as they are comprised solely of biocompatible elements. In the present study, a series of six Ca rich and ten Mg rich BMGs were synthesised and their corrosion behaviours characterised using potentiodynamic polarisation. A complex interaction between the elements in this compositional window was observed, whereby a significant increase in dissolution rate was accompanied by increasing Ca content or decreasing Mg content. Although the addition of Zn had a positive contribution in reducing the rate of corrosion, its effect was not dominant. In addition, a form of passivation was observed in the Mg rich BMGs, although it appears that such passive corrosion behaviour is not directly related to a high Zn content.
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