Journal
CORROSION SCIENCE
Volume 52, Issue 4, Pages 1413-1420Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.12.015
Keywords
Copper; Cyclic voltammetry; Pitting corrosion; Passivity; Neutral inhibition
Funding
- University of Mar del Plata [15/G225]
- National Research Council (CONICET) [PIP6252]
- Agenda Nacional de Promocion Cientifica y Tecnologica [PICT 6-34112]
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Three dosages of PO43- ions are evaluated as corrosion inhibitors of copper in artificial tap water by measuring the corrosion potential, polarization resistance, electrochemical impedance and reflectance spectra. The water is moderately hard, highly carbonated and chloride-rich. The results show that the surface film is composed by Cu2O. When the inhibiting agent is added, the film becomes thicker, denser and more compact. This behaviour is attributed to CuO incorporating into the passive layer. The optimal dosage of inhibitor is 10 mg l(-1) P when the polarization resistance increases three times. The inhibitor retards the pit initiation, without hindering pit growth. (C) 2009 Elsevier Ltd. All rights reserved.
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