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| EFFECT OF CYCLIC PRESSURE ON DEGRADATION BEHAVIOR OF EPOXY COATING IN SIMULATED DEEP OCEAN ENVIRONMENT |
| TANG Junwen1, SHAO Yawei1, ZHANG Tao1, MENG Guozhe1, WANG Fuhui1,2 |
1. Corrosion and Protection Laboratory, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2. State Key Laboratory for Corrosion and Protection, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The effect of cyclic pressure on the degradation behavior of the epoxy coating on carbon steel surface in 3.5% NaCl solution in a simulated deep-ocean environment was studied using electrochemical impedance spectroscopy (EIS) and weight method. The results showed that the EIS characteristics displayed a periodic variation under the cyclic pressure condition. The coating capacitance at high pressure was higher and the coating resistance was lower than that at atmospheric pressure during immersion periods, respectively. With increasing the cyclic pressure, the corrosion medium such as water had diffused to the coating/metal interface more easily. As a result, the increase of the water absorption capacity of the epoxy coating and the decrease of coating resistance were observed. The coating protection properties were obviously deteriorated.
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Received: 24 May 2010
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Corresponding Authors:
SHAO Yawei
E-mail: shaoyawei@hrbeu.edu.cn
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