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Electrochemical studies of laser-treated Co-Cr-Mo alloy in a simulated physiological solution

✍ Scribed by R. A. Silva; M. A. Barbosa; R. Vilar; O. Conde; M. Cunha Belo; I. Sutherland

Publisher
Springer
Year
1994
Tongue
English
Weight
451 KB
Volume
5
Category
Article
ISSN
0957-4530

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✦ Synopsis

The aims of this work were to study the crevice corrosion resistance of laser-treated Co-Cr-Mo alloy by electrochemical techniques and to characterize the electronic properties of the passivating films. Open-circuit experiments and cyclic polarizations with crevicefree samples have been carried out as well as electrochemical impedance spectra using Bode-Nyquist and Mott-Schottky techniques. Scanning electron microscopy (SEM) and Xray photoelectron spectroscopy (XPS) analysis have been used in order to evaluate surface modifications. It has been observed that laser-treated Co-Cr-Mo alloy shows good corrosion resistance in spite of some degradation at the dendrites formed during treatment. By XPS it was found that at 6-9 nm depth there exists an enrichment in oxygen and a decrease of Cr which could have a slight effect on the corrosion resistance and it was seen that the film is mostly formed by Cr203. Mott-Schottky plots show that a possible transition from n-type to p-type semiconductivity may have occurred.

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