Fe-Mn-C-Si alloy as possible material for degradable pin implants: surface and in vitro characterization

HANKOVITS, MELINA; BALLARRE, JOSEFINA; CERE, SILVIA

Simposio; 34ª Topical Meeting International Society of Electrochemistry (ISE); 2023

International Society of Electrochemistry

Biodegradablemetals are studied as temporary implants in the orthopedic field. They can beused as fixation devices to restore bone fractures due to their adequatemechanical properties, non-toxic degradation products, and the possibility ofavoiding a second surgical intervention to remove the device [1]. On thisbackground, Fe-based materials are promising materials due to theirdegradability and mechanical properties.To overcome theslow degradation rate of pure Fe, the addition of manganese (Mn) to get a FeMnsolid solution is under study. By alloying iron with manganese the corrosionrate is increased by the generation of micro galvanic corrosion sites and themagnetic susceptibility is reduced. In FeMn alloys the addition of Si alsoimplies an increase in the γ-austenite phase, which generates a microstructuralhomogeneity [2]. Also the addition of Si as alloying element presented apromising response in vitro and in vivo in the collagen synthesis andosteogenesis.The aim of this work is to analyze the in vitrobehavior of a new FeMnCSi alloy (Fe 26.5Mn 0.5C 1.14Si 0.03P 0.01S), andcompare it with the performance of pure iron in simulated body fluid (SBF). Thealloy was characterized in terms of electrochemistry response, microstructureand composition by X-ray diffraction and Raman spectroscopy. Assays wereperformed and analyzed after 2 h, 1 day and 14 days of immersion in SBF