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Cathodic disbonding of a thick polyurethane coating from steel in sodium chloride solution |
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| Authors: | JL Luo CJ Lin Q Yang SW Guan |
| Affiliation: | a Department of Chemical and Materials Engineering, University of Alberta Edmonton, AB T6G 2G6, Canada b Department of Chemistry, Xiamen University, Xiamen, China c Madison Chemical Industries Inc., 490 McGeachie Drive, Milton, ON L9Y 3Y5, Canada |
| Abstract: | The cathodic disbonding of a thick, pigmented polyurethane coating from steel in 3.5 wt.% NaCl solution was studied by using an electrochemical AC impedance technique. Double-cylinder electrolyte cells were designed to separate the measurements of cathodic disbonding process from the influence of the impedance of an artificial defect. It was found that for a thick, pigmented polyurethane coating, the more important transport pathway of the reactive species is along the coating/steel interface rather than through the coating. There existed a delay time for the cathodic disbonding process, and cathodic polarization was not a predominant factor in determining the cathodic disbonding behavior in the early stages. The thick polyurethane coating, which was applied on a well sand-blasted steel surface, had excellent resistance to cathodic disbonding. |
| Keywords: | Organic coatings Protective coatings Polyurethanes Steel Sodium chloride Degradation Cathodic protection Interfaces (materials) Electrolytic cells Electrochemistry Spectroscopy Cathodic disbonding Polyurethane coating Double cylinder electrolyte cell Cathodic polarization |
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