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| ACCELERATING DEGRADATION OF ORGANIC PROTECTION COATING UNDER FLOW STATE |
| Yinghua Wei;Lixin Zhang;Wei Ke |
| 中国科学院金属研究所; 金属腐蚀与防护国家重点实验室 |
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Abstract Fusion-bonded epoxy (FBE) powder coating on steel was selected to investigate the effect of flowing condition on coating degradation in 3% NaCl aqueous solution at 60℃ by EIS.The immersion tests in flowing condition were conduct
ed by using a rotating cylinder apparatus.The relative permittivity calculated from the high frequency value of impedance spectra,was used as the index to monitor properties variation with immersion time.The results obtained from EIS measurements and visual examination showed that the flowing immersion condition brought much greater destruction to the coatings than the corresponding static condition.This results can be explained that the introduction of flowing condition accelerated the ions,not water molecules,into the coatings.The present investi
gation provides an accelerating test way to evaluate degradation of excellent coating.
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Received: 23 November 2004
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Corresponding Authors:
Yinghua Wei
E-mail: yhwei@imr.ac.cn
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