Protective properties of intact unpigmented epoxy coated mild steel under cathodic protection |
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Authors: | Elsadig O Eltai JD ScantleburyEV Koroleva |
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Affiliation: | School of Materials, Corrosion and Protection Centre, The Mill, Sackville Street, The University of Manchester, M13 9PL Manchester, UK |
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Abstract: | Electrochemical Impedance Spectroscopy (EIS) has been used to characterise intact unpigmented epoxy coated mild steel with and without the application of cathodic protection (CP). Coated specimens were exposed to 0.6 M NaCL solution. Cathodic protection was applied at −0.78 V and −1.1 V (SCE). Coated specimens were also tested at Open Circuit Potential (OCP). The application of cathodic protection at −1.1 V was shown to affect the protective properties of the coating, causing the coating resistance to fall below the border line between fair and poor coating. The coating maintained a resistance in the order of 1 × 106 Ω cm2 when CP was applied at −0.78 V but a resistance of 1 × 105 Ω cm2 when CP was applied at −1.1 V. It was shown that water uptake by the coated specimens was considerably affected by the application of CP. The water uptake by the coated specimens was increased as a result of increasing the level of CP. The application of CP at −0.78 V, and −1.1 V was found to reduce the extent of corrosion on the coated specimens. |
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Keywords: | Epoxy coating Electrochemical Impedance Spectroscopy Cathodic protection Water uptake Coating metal interface |
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