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| Degradation Law of Two Kinds of Protective Coating Systems in Hot and Humid Marine Atmospheric Environment |
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| DOI：10.7643/issn.1672-9242.2022.12.012 |
| KeyWord:natural exposure test coating degradation analysis protection ability |
| Author | Institution |
| FENG Ya-fei |
No.92228 PLA, Beijing , China |
| ZHU Yu-qin |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing , China |
| SU Yan |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing , China |
| DAI Lu |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing , China |
| LI Jia-meng |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing , China |
| LONG Shi-teng |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing , China |
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| Abstract: |
| The work aims to study the degradation law of two kinds of protective coatings after 3 years of natural exposure in hot and humid marine atmospheric environment. Steel and aluminum (steel) connection fittings were selected as test samples and Wanning of Hainan was determined as the test site. The appearance, color difference, luster, surface Fourier transform infrared spectrum and electrochemical impedance of coatings A and B for different exposure time were measured periodically. Through comparison and analysis of the test results, the degradation degree of the two coatings for different exposure time was judged, and the degradation law was finally obtained. The coating A was severely aged after one year of natural exposure:the coating in fastener area was peeled off, the optical loss rate in plate area was about 75%, the impedance modulus was reduced by five orders of magnitude, the color difference ΔE was 5 (slight discoloration), and the organic groups in the coating were seriously aged and degraded. After two years of natural exposure, the coating B was seriously aged:the coating in the fastener area was spalling and rusting, the plate optical loss rate was about 20%, the impedance modulus was reduced by two orders of magnitude, the color difference ΔE was 11 (severe discoloration), and the organic groups of the coating were slightly aged and degraded. For screw connection structure, the connection area is not only easier to be corroded, but also increases the inconsistency of the adjacent plate area. The protection ability of coating system B is better than that of coating system A. The effective protection time of coating system B is about two years, while that of coating system A is less than one year. |
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