Corrosion study in artificial saliva of dental alloys based on cobalt and chromium, using electrochemical stationary methods and EIS

Xin Li (1) , Patrice Berthod (2) , Estelle Kretz (1)

1 UL - Université de Lorraine
2 IJL - Institut Jean Lamour

Dental cobalt alloys devoted to the constitution of frameworks strengthening fixed partial dentures may be based on cobalt and chromium but other elements such as tungsten, molybdenum and silicon, for example, can be also present in their chemical composition for mechanical reasons. In contrast with the alloys of the High Noble and Noble categories which are rich in gold or platinum, these cheaper alloys may be threatened by corrosion. The topic of this work is to characterize the electrochemical behavior, in a NaCl 9g/L aqueous solution rated at pH=7.4 and T=37°C, of six alloys based on cobalt and containing 25 wt.%Cr, with special focus on the effect of the presence of W (2.5, 5 and 7.5 wt.%), Mo (5 wt.%) and/or Si (1 wt.%) with contents typical of the ones of commercial dental alloys. The six alloys were all elaborated by high frequency induction foundry under inert atmosphere. The stationary electrochemical tests were driven according to the Stern-Geary and Tafel methods, or following the cyclic polarization technique. Electrochemical Impedance Spectroscopy was also applied.

Domaines: Matériaux

Xin Li, Patrice Berthod, Estelle Kretz. Corrosion study in artificial saliva of dental alloys based on cobalt and chromium, using electrochemical stationary methods and EIS. 2018 European Corrosion Congress (Eurocorr 2018), Sep 2018, Cracovie, Poland. . ⟨hal-03199698⟩