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

HANKOVITS MELINA; BALLARRE, J.; CERE SILVIA

Mar del Plata

Congreso; 34th ISE Topical Meeting; 2023

Sociedad Internacional de Electroquimica

Biodegradable metals are studied as temporary implants in the orthopedic field. They can be used as fixation devices to restore bone fractures due to their adequate mechanical properties, non-toxic degradation products, and the possibility of avoiding a second surgical intervention to remove the device . On this background, Fe-based materials are promising materials due to their degradability and mechanical properties.To overcome the slow degradation rate of pure Fe, the addition of manganese (Mn) to get a FeMn solid solution is under study. By alloying iron with manganese the corrosion rate is increased by the generation of micro galvanic corrosion sites and the magnetic susceptibility is reduced. Also the addition of Si as alloying element has been tested to have a promising response in vitro and in vivo in the collagen synthesis and osteogenesis. In FeMn alloys the addition of Si implies an increase in the γ-austenite phase, which generates a microstructural homogeneity The aim of this work is to analyze the in vitro behavior of a new FeMnCSi alloy (Fe 26.5Mn 0.5C 1.14Si 0.03P 0.01S), and compare it with the performance of pure iron in simulated body fluid (SBF). The alloy was characterized in terms of electrochemistry response, microstructure and composition by X-ray diffraction and Raman spectroscopy. Assays were performed and analyzed after 2 h, 1 day and 14 days of immersion in SB