Evaluation of corrosion resistance of Co-Cr alloys fabricated with different metal laser sintering systems


Tuna S. H., KARACA E., Aslan I., Pekkan G., Pekmez N. O.

JOURNAL OF ADVANCED PROSTHODONTICS, vol.12, no.3, pp.114-123, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 3
  • Publication Date: 2020
  • Doi Number: 10.4047/jap.2020.12.3.114
  • Journal Name: JOURNAL OF ADVANCED PROSTHODONTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.114-123
  • Keywords: Co-Cr alloy, Corrosion, Metal laser sintering Powder, PHOSPHATE REINFORCED COCRMO, IN-VITRO BIOCOMPATIBILITY, DENTAL CASTING ALLOYS, MECHANICAL-PROPERTIES, MICROSTRUCTURE, RELEASE, COBALT, MO, CHROMIUM, BEHAVIOR
  • Dokuz Eylül University Affiliated: No

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 (R) Star (RS-MLab), respectively. Eight specimens from each group were prepared. Open circuit potential (E-ocp) 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. E-ocp, charge transfer resistance (R-alpha) values, and released ions (mu g/cm(2) x 7d) in different solutions were determined. The specimen surfaces were observed with SEM/EDS. Results were analyzed statistically. RESULTS. E-ocp values have shifted to potentials that are more positive over time. Steady-state E-ocp 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 R-alpha 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.