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Application of electrochemical noise to evaluate outdoor atmospheric corrosion of copper after relatively short exposure periods

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Abstract

This study focused on the application of electrochemical noise to assess the protection level of corrosion products formed on copper during relatively short exposure time in different outdoor atmospheres. Electrochemical noise, cathodic reduction measurements and gravimetric (mass loss) analysis were applied to copper samples exposed at urban and rural/industrial areas in Cuba for 4 months. Measurements of Electrochemical current noise indicated that the poorest protective corrosion products were formed on samples exposed to atmospheres with high concentration of H2S which agreed with the corrosion rate determined by mass loss and electrochemical chronopotentiometry (cathodic reduction). The electrochemical noise methodology proposed in this work showed acceptable and reproducible results by using an electrochemical cell in which the electrolyte was formed by a distilled-water wetted cloth in contact with the compounds present on a corroded metallic surface. This methodology indicated that the corrosion protection level of the corrosion products formed on copper is related to the corrosivity of the atmosphere.

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Acknowledgements

The authors appreciate the contribution of C. Valdes and Y. Martin, E. Gonzalez and J. Perez (National Center for Scientific Research (CNIC), Havana City, Cuba). The authors thank Dr. David Greenfield (Sheffield Hallam University) for the revision and comments made to the manuscript.

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Correspondence to J. González-Sánchez.

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García-Ochoa, E., González-Sánchez, J., Corvo, F. et al. Application of electrochemical noise to evaluate outdoor atmospheric corrosion of copper after relatively short exposure periods. J Appl Electrochem 38, 1363–1368 (2008). https://doi.org/10.1007/s10800-008-9572-9

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  • DOI: https://doi.org/10.1007/s10800-008-9572-9

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