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Corrosion behaviour of cobalt–chromium dental alloys doped with precious metals

Paper ID Volume ID Publish Year Pages File Format Full-Text
12614 805 2005 8 PDF Available
Title
Corrosion behaviour of cobalt–chromium dental alloys doped with precious metals
Abstract

Precious metal based dental alloys generally exhibit a superior corrosion resistance, in particular enhanced resistance to pitting and crevice corrosion, compared to non-precious metal based alloys such as CoCr alloys. A new generation of Co–Cr alloys enriched with precious metals (Au, Pt, Ru) have now appeared on the market. The goal of this study was to clarify the effect of the precious metals additions on the corrosion behaviour of such alloys. Various commercial alloys with different doping levels were tested by electrochemical techniques in two different milieus based on the Fusayama artificial saliva and an electrolyte containing NaCl. Open circuit potentials, corrosion currents, polarization resistances, and crevices potentials were determined for the various alloys and completed by a coulometric analysis of the potentiodynamic curves. In addition, the microstructures were characterised by metallography and phase compositions analysed by EDX.The results show that the presence of precious metals can deteriorate the corrosion behaviour of Co–Cr alloys in a significant way. Gold doping, in particular, produces heterogeneous microstructures that are vulnerable to corrosive attack.

Keywords
Dental alloys; Co–Cr with precious metals; Gold; Platinum; Ruthenium; Corrosion; Crevice corrosion; Pitting corrosion; Metallography; Surface analysis
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Corrosion behaviour of cobalt–chromium dental alloys doped with precious metals
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 21, July 2005, Pages 4358–4365
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us