Visualisation of the Galvanic Effects at Welds on Carbon Steel

Non-destructive classical techniques, such as electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) measurement, were complemented with advanced techniques, including the scanning vibrating electrode technique (SVET) and localised electrochemical impedance spectroscopy (LEIS)...

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Bibliographic Details
Published in:Journal of the Brazilian Chemical Society 2015-04, Vol.26 (4), p.667-675
Main Authors: Pagotto, Josias F., Montemor, Maria F., Recio, Francisco J., Motheo, Artur J., Simões, Alda M., Herrasti, Pilar
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
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Summary:Non-destructive classical techniques, such as electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) measurement, were complemented with advanced techniques, including the scanning vibrating electrode technique (SVET) and localised electrochemical impedance spectroscopy (LEIS) to examine galvanic effects at welds on carbon steel. The classical techniques indicated that corrosion processes are accelerated in the weld. The advanced techniques revealed admittance values related to more severe corrosion along the weld than in the base metal and higher corrosion currents in the weld. When the weld and base metal are electrically connected, the weld serves as a cathodic protector for the base metal.
ISSN:0103-5053
1678-4790
DOI:10.5935/0103-5053.20150024