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Corrosion properties of biodegradable AZ31 and ZK60 magnesium alloys: in situ study
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1  Institute of Advanced Technologies, Togliatti State University, Russia


Biodegradable magnesium alloys is promising materials for medicine application. The corrosion rate and type of corrosion are ones of most important properties for this kind of materials. Fine-grained biodegradable alloys AZ31 (hot-rolled) and ZK60 (extruded) were studied in present work with using in-situ methods such as hydrogen evolve corrosion rate evaluating and incessant surface observation and ex-situ methods such as weight loss and confocal laser scanning microscopy investigation. Experiment methodic include immersion test in SBF (0.9% NaCl aqueous solution) in 120 hours with 37 oC with recirculating corrosion media. Hydrogen evolve was measuring with burette with frequency 1 hour, surface observation made by high-definition camera, pH was measuring twice a day. Corrosion rate curves, 3D corrosion surface morphology and videos shown staging of corrosion damage were received. As a result, ZK60 is less corrosion resistant and addicted to pitting corrosion, whereas AZ31 shown filiform corrosion.

Keywords: magnesium alloys; biodegradable materials; in-situ investigation; corrosion rate; corrosion mechanism