Combined anodizing and picosecond laser treatment to control the corrosion rate of biodegradable magnesium alloy AZ31

Autor:	Barry O'brien, Alan J. Conneely, William M. Carroll, Gerard M. O'Connor
Rok vydání:	2013
Předmět:	Materials science Picosecond laser Anodizing Magnesium Mechanical Engineering Biodegradable implants Metallurgy Alloy chemistry.chemical_element engineering.material Biodegradation Corrosion Biodegradable magnesium chemistry engineering General Materials Science
Zdroj:	Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 228:278-287
ISSN:	2041-3076 1464-4207
DOI:	10.1177/1464420713487648
Popis:	The corrosion rate of magnesium alloys is generally too high for biodegradable implant applications. This work explored combinations of anodizing and picosecond laser surface treatments to modify the corrosion response of magnesium alloy AZ31. Anodizing of the AZ31 in NaOH solutions produced porous oxide layer structures. Shallow laser treatment of these anodized surfaces, using low pulse powers, resulted mainly in oxide ablation and impaired corrosion resistance. Higher pulse power, resulting in rapid melting and resolidification into the substrate, provided an improved corrosion response. The refined grain structure produced is approximately only 5 µm deep and therefore has minimal influence on bulk mechanical properties. It is therefore a suitable process for surface modifications on small medical device structures. Controlling the initial point of degradation has been demonstrated by the use of selective laser treatment of the AZ31 surface.
Databáze:	OpenAIRE
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