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Microstructural, mechanical and corrosion properties of two cast binary cobalt-chromium alloys base of real dental alloys for prosthetic dentistry

Princilia Billy, Patrice Berthod

Cobalt-based alloys containing chromiumin quantity high enough represent a family of rather cheap dental alloys, besides themaybewell-known nickelbased family. They are able to bring mechanical properties and corrosion resistance high enough to be used in prosthetic dentistry instead much more expensive alloys based on noble metals. After a recent study concerning two simple nickel-chromium alloys derived from commercial dental alloys, this aim of this work is to reproduce the same tests on binary cobalt-chromium alloys, a first one itself simplified version of another commercial alloy, and a second one containing less chromium. Elaboration by casting, hardness and compression characterization, and evaluation of the corrosion behaviour in a simple artificial saliva by the means of electrochemical techniques, allowed seeing that the Co-15wt.%Cr alloy was better than the Co-30Cwt.%Cr one simultaneously in term of mechanical properties and of corrosion behaviour. It may represent an interesting base for new more complex cobalt-based alloys.