Influence of the Cr Content on the Corrosion
Properties of a Series of Binary Cobalt-Chromium
Alloys in Acidic Artificial Saliva
Volume 2 - Issue 1
Estelle Kretz and Patrice Berthod*
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- Faculty of Science and Technologies, University of Lorraine, France
*Corresponding author:
Patrice Berthod , Faculty of Science and Technologies, Institut Jean Lamour, University of Lorraine, Campus Victor
Grignard, Postal Box 70239, 54506 Vandoeuvre-lès-Nancy, Cedex, France
Received: February 23, 2018; Published: March 06, 2018
DOI: 10.32474/AOICS.2018.02.000128
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Abstract
Cobalt-based alloys are more and more considered for dental applications, instead the expensive noble alloys and the other
predominantly based alloys based on the allergen element nickel. These alloys frequently contain chromium to allow good resistance
against corrosion as this may take place in the buccal milieu. The most often chromium is present in high quantity, close to 30wt.
%, but it is maybe possible to decrease a little its contents without losing corrosion resistance. The aim of this study is exploring
how the corrosion behavior of a cobalt alloy may vary versus its chromium content. In order to simplify this investigation only CoxCrbinary
alloys were considered, with x decreasing from 30 to 0wt.% by slices of 5wt.%. A series of seven alloys was synthesized
by foundry under inert atmosphere and their behavior in corrosion in an artificial saliva of simple composition (NaCl 9g/L) acidified
to pH=2.3 was specified using various classical electrochemical techniques (open circuit potential follow-up, Stern-Geary, Tafel,
cyclic polarization). It appeared that passivation of the alloys occurred during the first two hours of immersion when the chromium
content was 10 wt. % or higher, with as result high corrosion potentials and low corrosion current densities.
Keywords: Dental cobalt alloys; Chromium content; Acidic artificial saliva; Corrosion; Electrochemical techniques
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