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- Title
Electrochemical corrosion behaviour of Co–Cr–Mo–W alloy and its surface anodic oxide film in artificial saliva.
- Authors
MOGODA, A S; TAMMAM, REHAM H
- Abstract
The electrochemical behaviour of the Co–Cr–Mo–W alloy in the Fusayama synthetic saliva was examined as a function of fluoride ion concentration, pH level, and immersion time using open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The OCP results showed that the rate of growth of the air-formed film on the Co–Cr–Mo–W alloy surface lowers as the concentration of the F– ions added to saliva increases. Additionally, in all of the pH values of saliva examined (from 2 to 11), the OCP became more positive over time, indicating the development of the native film on the alloy. The results of impedance and potentiodynamic polarization revealed that the corrosion resistance of the primarily produced oxide layer on the alloy decreased with an increase in the F– ions in saliva, but increased with an increase in saliva pH value. According to the EIS findings, the thickness of the anodic oxide film on the Co–Cr–Mo–W alloy increases with rising pH levels in the formation medium (saliva). By using energy-dispersive X-ray spectroscopy (EDS), it was discovered that as the salvia pH rises, the amount of oxygen on the alloy surface increases, indicating the development of a protective oxide layer. The surface roughness of the mechanically polished alloy surface rises with anodic polarization in an alkaline saliva solution, according to atomic force microscopy. The results of scanning electron microscopy and EIS show that as the alloy is immersed in saliva for a longer time, the thickness of the air-formed film on the alloy increases.
- Subjects
ARTIFICIAL saliva; OXIDE coating; DENTAL metallurgy; ELECTROLYTIC corrosion; ANODIC oxidation of metals; OPEN-circuit voltage; ATOMIC force microscopy; ALLOYS
- Publication
Bulletin of Materials Science, 2024, Vol 47, Issue 2, p1
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-024-03173-9