Magnesium and magnesium alloys as degradable metallic biomaterials

Wang, H. and Shi, Z. M. and Yang, K. (2008) Magnesium and magnesium alloys as degradable metallic biomaterials. In: International Conference on Frontiers in Materials Science and Technology (FMST 2008), 26-28 Mar 2008, Brisbane, Australia.

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Abstract

Drawbacks associated with permanent metallic implants lead to the search for degradable metallic biomaterials. Magnesium has been considered as it is essential to bodies and has a high biodegradation potential. For magnesium and its alloys to be used as biodegradable implant materials, their degradation rates should be consistent with the rate of healing of the affected tissue, and the release of the degradation products should be within the body's acceptable absorption levels. Conventional magnesium degrades rapidly, which is undesirable. In this study, biodegradation behaviours of high purity magnesium and commercial purity magnesium alloy AZ31 in both static and dynamic Hank's solution have been systematically investigated. The results show that magnesium purification and selective alloying are effective approaches to reduce the degradation rate of magnesium. In the static condition, the corrosion products accumulate on the materials surface as a protective layer, which results in a lower degradation rate than the dynamic condition. Anodised coating can significantly further reduce the degradation rate of magnesium. This study indicates that magnesium can be used as degradable implant materials as long as the degradation is controlled at a low rate. Magnesium purification, selective alloying and anodised coating are three effective approaches to reduce the rate of degradation.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version deposited in accordance with the copyright policy of the publisher (Trans Tech).
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 15 Sep 2010 09:51
Last Modified: 04 Aug 2014 06:33
Uncontrolled Keywords: biodegradable materials; biomaterials; magnesium alloys; biocorrosion behaviour
Fields of Research (FOR2008): 12 Built Environment and Design > 1204 Engineering Design > 120402 Engineering Design Knowledge
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
Socio-Economic Objective (SEO2008): B Economic Development > 86 Manufacturing > 8612 Fabricated Metal Products > 861203 Metal Castings
Identification Number or DOI: 10.4028/www.scientific.net/AMR.32.207
URI: http://eprints.usq.edu.au/id/eprint/8208

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