Evaluation of localised corrosion behaviour of super austenitic stainless steels using dynamic electrochemical impedance spectroscopy
✍ Scribed by S. Nagarajan; S. Tamilselvi; N. Rajendran
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- German
- Weight
- 247 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0947-5117
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✦ Synopsis
Abstract
Potentiodynamic polarisation and dynamic electrochemical impedance spectroscopic (DEIS) measurements were carried out in natural sea water on type 316L SS, Alloy 926 and Alloy 31. In order to study the localised corrosion resistance, the dynamic electrochemical impedance spectroscopy measurements were performed in a wide range of potentials covering corrosion potential (OCP or E~corr~), passive region, break down region and dissolution region. In this report we have shown that the impedance measurement in potentiodynamic condition allows simultaneous investigation of the changes in the passive layer structure and the ion transport process that occurs through the passive layer. The Nyquist plots were fitted using nonlinear least square (NLLS) method for different potential regions. Finally, the experimental results of polaraisation data were found in good agreement with that of DEIS measurement.