Fabrication, characterization and investigation on the corrosion behavior of the Vitallium alloy scaffold with nanoscale bioglass coating Cobalt base alloys, especially Vitallium, are particularly useful as medical implants due to their excellent mechanical properties and good biocompatibility, but because of limitations such as mechanical mismatch, bioinactivity and poor corrosion behavior of this alloy in the body fluid. For this reason, the purpose of this study was to create a porous cobalt-based alloy (scaffold) using a space holder as well as a coating of 58S bio-glass on this substrate in order to improve mechanical behavior and to provide a mechanical matching between implant and bone As well as bioactivity and corrosion behavior in this alloy. blending the powder with a 5% wt of ammonium hydrogen carbonate and 95% w of polyvinyl alcohol and two-stage sintering at 175 and 1250 ° C for 3 and 2 h, the porous substrate with 35.6% Porosity was obtained. In the second step, in order to improve the bioactive and corrosion behavior of the porous alloy, the 58S bioglass was coated on a porous substrate with a sol-gel method for 3, 4 and 5 times dipping, and dried in ambient atmosphere and temperature of 60 ° C for 48 h. After drying and submersion operation at 600 ° C for 1 h with 10 ° C / min heating rate was applied to the furnace to stabilize the coating on the substrate. Consequently, After compression test on porous samples, compressive strength and compression modulus were observed 84.47 MPa and 0.4 GPa, respectively. with a bioactive study, it was observed that the coating sample had a higher surface hydroxyapatite than the uncoated sample, indicating an increase in the bioactivity in the coating sample.Also, by examining the corrosion behavior of uncoated and glass-coated samples, the corrosion resistance of the uncoated sample was about 200 k? and in the sample with a coating of about 250 k?. Eventually, after potentiodynamic polarization, E Corr (vs Ag/AgCl) and I Corr changes from -0.18± 0.016 V and 0.0055± 0.0005 ?A/cm 2 in uncoated substrate to -0.098± 0.005V and 0.0009± 0.0001 ?A/cm 2 in coated sample with 58S bioglass.
