In-situ study of magnesium alloys degradation in SBF solutions using AFM

abstrakt

angličtina

Magnesium and magnesium alloys based materials find, due to their specific properties, huge application possibilities mainly in automotive, engineering, transport and space industry. Their usage for biomedical engineering applications such as biodegradable tissue and cardiovascular implants is also an important field of application. Important properties of magnesium alloys are biocompatibility and/or biodegradability, high specific strength and high internal dumping values. Main fields of magnesium alloys study, in the last decade, are development of new biodegradable alloys, investigation of new production and processing technologies and evaluation of magnesium alloys electrochemical and degradation properties in SBF solutions. From the point of view of interaction of magnesium alloys with biological systems, cytotoxicity, viability and biodegradability based experimental in vitro tests were proposed. Magnesium alloys degradation is strongly dependent on their chemical composition and production and processing of the alloy, which influence the reached microstructure, chemical and phase composition of the material. Corrosion mechanisms studies and analysis performed on magnesium alloys are nowadays focused on degradation analysis in SBF solutions. Within the cooperation of the Institute of Biophysics AS CR, v. v. i. and the Faculty of Mechanical Engineering BUT new methodology for in-situ evaluation of selected magnesium alloys degradation in SBF solutions by Atomic force microscopy (AFM) was developed and proposed. Veeco Multimode VIII AFM was used for the studies performed in water cell by continual SBF solution exchange/replacement. Selected magnesium alloys degradation was examined in chemically different corrosion solutions (different SBF - Hanks solutions), simulated body fluids. AZ31 and AZ61 magnesium alloy processed by advanced squeeze casting method were used for initial experiments. Degradation properties of examined alloys were influenced by different microstructure, chemical and phase composition. In-situ methodology developed and proposed for magnesium alloys degradation evaluation by AFM contributed in a significant way to understanding of magnesium alloys degradation mechanism and rate. From the methodology point of view, exist a strong expectation of developed in-situ tests

Magnesium and magnesium alloys, degradation, SBF

FOJT, L.; DOLEŽAL, P.

25. 3. 2015

SPM workshop 2015 seminář o metodách blízkého pole

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http://www.nanometrologie.cz/sbornik.pdf