Analysis of Dental Alloys Characteristics (Microstructure and Corrosion Resistance) for Different Obtaining Methods

Résumé

A dental alloy was studied by electro-chemical polarization method, scanning electrons microscopy (S.E.M.) and X-ray dispersive energy analysis (EDAX) equipments analyzing the influence of casting process on microstructure and corrosion behaviour. These studies present that in natural aerated Afnor solution saliva this alloy behaves as a corrosion resistant alloy. By casting, this alloy undergoes a significant modifications of both internal microstructure and corrosion resistance. Using  over-potentials bigger than five hundred mV (SCE) in artificial saliva this alloy exhibits a generalized corrosion, the surface morphology being dissimilar for commercial and as-cast samples. EDAX studies point out that corrosion takes place especially by cobalt dissolution.