Microstructures, Hardness and Corrosion Behaviours in a Neutral Artificial Saliva of a Series of {Cobalt-Chromium}-Based Alloys; Influence of the Presence and Contents of the Minor Elements W, Mo and Si

Abstract

International audienceDental cobalt alloys devoted to the constitution of frameworks strengthening fixed partial dentures may be based on cobalt and chromium. Such alloys generally contain also other elements such as tungsten, molybdenum and silicon, for example. These minor elements may be added 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. When it happens this phenomenon may cause health problems, allergic diseases typically. The topic of this work is to characterize the electrochemical behavior of six alloys based on cobalt and containing 25 wt.%Cr, in a NaCl 9g/L aqueous solution rated at pH=7.4 and T=37°C