Corrosion Resistance of Co-Cr-Mo Alloy Used in Dentistry

Abstract

The presented paper studies the effect of the casting technology on the corrosion resistance of Co-Cr-Mo alloy. The investigations were conducted on a commercial alloy with the brand name ARGELOY N.P SPECIAL (Co-Cr-Mo) produced by Argen as well as the same alloy melted and cast by the lost wax casting method performed by a dental technician. The corrosion behavior of the dental alloys in an artificial saliva was studied with the use of the following electrochemical techniques: open circuit potential and voltammetry. After the electrochemical tests, studies of the surface of the examined alloys were performed by means of a scanning electron microscope with an X-ray microanalyzer. The results of the electrochemical studies show that the dependence of the corrosion resistance on the microstructure associated with the recasting process is marginal. The results of the electrochemical studies of the considered alloy clearly point to their good corrosion resistance in the discussed environment.Keywords: cobalt alloys, corrosion resistance, method of wasted wax, microstructureZbadano wpływ technologii odlewania na odporność korozyjną stopu Co-Cr-Mo. Badaniom poddano stop komercyjny o nazwie handlowej ARGELOY N.P SPECIAL (Co-Cr-Mo) firmy Argen oraz ten sam stop przetopiony i odlany przez technika dentystycznego metodą traconego wosku. Zachowanie korozyjne badanego stopu w środowisku sztucznej śliny zostało zbadane przy użyciu technik elektrochemicznych: pomiaru potencjału bezprądowego, woltamperometrii cyklicznej.Po przeprowadzeniu badań elektrochemicznych wykonano badania powierzchni badanego stopu przy pomocy elektronowego mikroskopu skaningowego z mikroanalizatorem rentgenowskim. Wyniki badań elektrochemicznych wskazują, że na odporność korozyjną oraz mikrostrukturę stopu proces powtórnego odlania wpływa jedynie w niewielkim stopniu. Wyniki badań elektrochemicznych rozpatrywanego stopu wskazują jednoznacznie na ich dobrą odporność korozyjną w rozpatrywanym środowisku.

THE EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURE AND PROPERTIES OF THE CORROSION RESISTANCE OF THE PROSTHETIC ALLOY WIRONIT EXTRAHART (Co-Cr-Mo)

“…1a). Based on the literature data [10][11][12][13], we know that in casting cobalt alloys, the structure is homogenous. The primary structure of cobalt-based alloys, after crystallization under conditions typical of prosthetic alloys, consists of very large crystals of the matrix, which is constituted by a solution of chromium, molybdenum and carbon.…”

Electrochemical and corrosion behavior of two chromium dental alloys in artificial bioenvironments

“…1b) has an austenitic matrix composed of the solid solution of cobalt and chromium, and the dendritic structure formed by different chemical segregations. Despite the fact that it is the most studied non precious dental alloy, yet many works are devoted to the study of its structure [11][12][13]. Most of segregated phases are carbides with different formal oxidation number, compounds from MC to M23C6 with specific morphologies such as spherical with discontinuous arrangement or agglomerated within grain boundaries.…”

Microstructure And Functional Properties Of Prosthetic Cobalt Alloys CoCrW

“…Within the scope of biocompatibility, prosthetic alloys should not cause allergy or contain toxic substances. Moreover, they should be resistant to corrosion and loss of lustre in the environment of oral cavity [10,11]. At the same time, they should be relatively cheap and easily worked in mechanical treatment.…”