Electroformed iron as new biomaterial for degradable stents: Development process and structure–properties relationship☆

DEGRADATION BEHAVIOR OF A BIODEGRADABLE Fe-Mn ALLOY PRODUCED BY POWDER SINTERING

“…The corrosion rate of porous Fe-35Mn alloys in this study reaches 1.4 mm/year that is about twice high as cold rolled Fe35Mn alloys and electroformed iron, and eight times high as annealed CTT-Fe (casting and thermomechanical treatment) [18]. Also this value is about half of the rate for AM60B-F Mg alloys [18]. The achievement of this moderate corrosion rate is encouraging.…”

“…Fe35Mn alloys produced by powder sintering corrode faster than both quenched and cold rolled Fe35Mn alloys that show the CR of 0.4 and 0.7 mmpy respectively [17]. The corrosion rate of porous Fe-35Mn alloys in this study reaches 1.4 mm/year that is about twice high as cold rolled Fe35Mn alloys and electroformed iron, and eight times high as annealed CTT-Fe (casting and thermomechanical treatment) [18]. Also this value is about half of the rate for AM60B-F Mg alloys [18].…”

Effect of electrodeposition current density on the microstructure and the degradation of electroformed iron for degradable stents

“…The details on electrodeposition set-up and parameters including electrolyte, additives, temperature, pH, cathode and anode were presented elsewhere [7]. Different current densities of 1, 2, 5 and 10 Adm -2 were applied for 8, 4, 2 and 1h respectively to obtain ~100-µm thick foils with different microstructures.…”

“…In the case of electroformed iron, a strong (1 1 1) texture with grain size of 4 µm was obtained at current density of 2 Adm -2 . This texture showed a uniform corrosion faster than that of Armco ® iron with 25 µm grains [7,8]. However, the corrosion behavior of electroformed iron with other textures has not yet been studied.…”

“…We previously reported the fabrication and evaluation of electroformed pure iron aimed to degradable stents [7,8]. Electrodeposition is a technique generally used to produce coatings which improve the surface conditions of the substrate metal [9].…”