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. 2020 Jun;12(3):114-123.
doi: 10.4047/jap.2020.12.3.114. Epub 2020 Jun 18.

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

Süleyman Hakan Tuna  1 , Erhan Karaca  2 , İsmail Aslan  3 , Gürel Pekkan  4 , Nuran Özçiçek Pekmez  2
Affiliations

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

Süleyman Hakan Tuna et al. J Adv Prosthodont. 2020 Jun.

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.

Keywords: Co-Cr alloy; Corrosion; Metal laser sintering; Powder.

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Figures

Fig. 1
Fig. 1. Eocp curves for 10 hours.
Fig. 2
Fig. 2. (A) Nyquist plots of specimens recorded in artificial saliva solution and equivalent circuit model based on EIS measurements of data obtained, (B) Experimental (red dotted) and fitted (yellow dotted) data for the Nyquist curve of RS-MLab.
Fig. 3
Fig. 3. Bode plots of specimens recorded in artificial saliva solution.
Fig. 4
Fig. 4. SEM view of polished, immersed, and etched specimens from each group. (A) ST-Pro, (B) SP2-Mys, (C) SP2-EOS, (D) SB-SLM, (E) RS-MLab (Magnification ×10,000).
See this image and copyright information in PMC

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