Evaluation of corrosion resistance of Co-Cr alloys fabricated with different metal laser sintering systems
Tuna Suleyman Hakan, Karaca Erhan, Aslan Ismail, Pekkan Gurel, Pekmez Nuran Ozcicek,
소속 상세정보
( Tuna Suleyman Hakan ) - Suleyman Demirel University Faculty of Dentistry Department of Prosthodontics
( Karaca Erhan ) - Hacettepe University Faculty of Science Chemistry Department
( Aslan Ismail ) - Burdur Mehmet Akif Ersoy University Faculty of Dentistry Department of Prosthodontics
( Pekkan Gurel ) - Tekirdag Namık Kemal University Faculty of Dentistry Department of Prosthodontics
( Pekmez Nuran Ozcicek ) - Hacettepe University Faculty of Science Chemistry Department
Abstract
PURPOSE: The aim of this study was to evaluate the corrosion resistance of the specimens produced by five different 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 MLab Cusing-Remanium® Star (RS-MLab), respectively. Eight specimens from each group were prepared. Open circuit potential (Eocp) and electrochemical impedance spectroscopy (EIS) measurements of polished surfaces of the specimens were conducted in a three-electrode cell using a potentiostat-galvanostat in Fusayama-Meyer artificial saliva (AS). Specimens from each group were immersed in AS and de-ionized water for seven days. Eocp, charge transfer resistance (Rct) values, and released ions (μg/cm2 × 7d) in different solutions were determined. The specimen surfaces were observed with SEM/EDS. Results were analyzed statistically.
RESULTS: Eocp values have shifted 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 the highest Rct value, followed by SP2-Mys, SB-SLM, SP2-EOS, and ST-Pro. In all groups, ion release was higher in AS than that in de-ionized water.
CONCLUSION: There were small differences among the corrosion resistances of the Co-Cr alloy specimens produced with MLS systems; meanwhile, the corrosion resistances were quite high for all specimens.
키워드
Co-Cr alloy; Corrosion; Metal laser sintering; Powder
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