| MAN Cheng,GUO Jing-yi,SUN Yi-xiang,CUI Zhong-yu,WANG Xin,CUI Hong-zhi.Failure Behaviour of Some Classical Protective Coatings in Antarctic Environments[J],51(6):27-35 |
| Failure Behaviour of Some Classical Protective Coatings in Antarctic Environments |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.06.003 |
| KeyWord:Antarctic Zhongshan Station antarctic epoxy coating polyurethane coating atmospheric corrosion |
| Author | Institution |
| MAN Cheng |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
| GUO Jing-yi |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
| SUN Yi-xiang |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
| CUI Zhong-yu |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
| WANG Xin |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
| CUI Hong-zhi |
School of Material Science and Engineering, Ocean University of China, Shandong Qingdao , China |
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| Abstract: |
| The specific effects of various special environmental factors on the failure of typical organic coatings in Antarctica were studied. Epoxy resin and polyurethane coating systems exposed for 1 year at Zhongshan Station in Antarctica were regarded as experimental subjects. In this paper, the failure behavior of the coatings and the mechanism of environmental factors at Zhongshan Station were systematically investigated by means of gloss value tests, color difference tests, adhesion tests, SEM, EIS, FTIR, etc. The surface of the epoxy resin-based coatings showed flaking, blistering, micro-cracks and pit damage visible to the naked eye, and showed more obvious light loss, color loss, adhesion loss, chemical structure changes than polyurethane coating. In addition, the electrochemical test results showed that the protection performance of the six coatings without scratch decreased after 1 year of exposure, with a decrease of approximately 1 order of magnitude in |Z|0.01 Hz. The epoxy resin coated scratched specimens showed worse protection with a maximum drop of 5 orders of magnitude in |Z|0.01 Hz, reaching a minimum of 4.02×104 Ω.cm2; in contrast, the aliphatic polyurethane coating still maintained its |Z|0.01 Hz at around 1011Ω.cm2, indicating that it still had good corrosion protection. The FTIR test results show that under the influence of the strong Antarctic UV environment, some of the functional groups of the epoxy-based coating underwent hydrolysis reactions, while the polyurethane coating did not undergo significant chemical structure changes. In addition, the epoxy coatings showed a high rate of adhesion loss, up to 77%, while the polyurethane coatings maintained a high level of adhesion in comparison. In general, the high humidity and salinity, strong UV, strong winds and low temperatures of the Antarctic Zhongshan Station play an important role in the failure of the coatings. |
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