The aim of this study was to evaluate the corrosion resistance of the specimens produced by fivedifferent commercial metal laser sintering (MLS) systems with their recommended Co-Cr alloy powders.MATERIALS AND METHODS. The MLS machines and the alloy powders used were, ProX 100-ST2724G (St-Pro),Mysint 100-EOS SP2 (SP2-Mys), EOSINT 270-EOS SP2 (SP2-EOS), SLM 100-Starbond CoS (SB-SLM), and MLabCusing-Remanium? Star (RS-MLab), respectively. Eight specimens from each group were prepared. Open circuitpotential (Eocp) and electrochemical impedance spectroscopy (EIS) measurements of polished surfaces of thespecimens were conducted in a three-electrode cell using a potentiostat-galvanostat in Fusayama-Meyer artificialsaliva (AS). Specimens from each group were immersed in AS and de-ionized water for seven days. Eocp, chargetransfer resistance (Rct) values, and released ions (μg/cm2 × 7d) in different solutions were determined. Thespecimen surfaces were observed with SEM/EDS. Results were analyzed statistically. RESULTS. Eocp values haveshifted to potentials that are more positive over time. Steady-state Eocp values were from high to low as follows,SB-SLM, SP2-Mys, SP2-EOS, RS-MLab, and ST-Pro, respectively. After 60 mins, RS-MLab specimens had thehighest Rct value, followed by SP2-Mys, SB-SLM, SP2-EOS, and ST-Pro. In all groups, ion release was higher in ASthan that in de-ionized water. CONCLUSION. There were small differences among the corrosion resistances ofthe Co-Cr alloy specimens produced with MLS systems; meanwhile, the corrosion resistances were quite high forall specimens.
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