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Heat Treatments Influence on Corrosion Resistance of some New Dental Cobalt Alloys

A new composition of a dental cobalt alloy was proposed from the system CoCrMoTi, which was compared with a commercial dental alloy, type Wironit. Some heat treatments were applied either for stabilizing the structure, or to simulate welding conditions (such as sensibilization treatments in the range of temperature about 550°C÷-650°C). Corrosion tests were made in two body simulated fluids, respectively infusion NaCl solution and Ringer solution. The results showed that titanium alloying may improve corrosion resistance of the alloy, and also the best state considering corrosion resistance is normalizing at 1100°C with one hour maintaining in air cooling at both alloys, with or without titanium. The worse corrosion resistance is obtained in sensibilized state.