|
|||||
|
|
Cathodic disbonding of a thick polyurethane coating from steel in sodium chloride solution |
|
| Authors: | J.L Luo C.J Lin Q Yang S.W 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 |
| 本文献已被 ScienceDirect 等数据库收录！ | |