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| Electrochemical Behaviour of Epoxy Anticorrosive Coatings in Deep-sea Environment |
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| DOI：10.7643/issn.1672-9242.2023.02.011 |
| KeyWord:deep sea simulated deep-sea test epoxy anticorrosion coating in-situ electrochemical impedance spectra water adsorption |
| Author | Institution |
| DUAN Ti-gang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| LIU Teng-teng |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| MA Li |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| PENG Wen-shan |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| TONG Hong-tao |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| CHEN Meng-yao |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China;College of Mechanical and Electrical Engineering, China University of Petroleum, Shandong Qingdao , China |
| XING Shao-hua |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
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| Abstract: |
| This work aims to evaluate the anticorrosion performance of aluminum alloy-based epoxy anticorrosive coating in deep-sea environment, and provide support for anticorrosion of aluminum alloy structure in deep-sea environment. Natural deep-sea environmental exposure experiments and laboratory simulated deep-sea corrosion tests of aluminum-based epoxy anticorrosive coatings were carried out respectively with the near-bottom suspending deep-sea environmental test facility and the simulated deep-sea high-pressure test system to study the protection performance and electrochemical behavior of aluminum alloy-based epoxy anticorrosive coating in deep-sea environment. The field exposure results in the South China Sea showed that the epoxy coatings displayed good protection effect for aluminum substrates with the adhesion strength of ＞9 MPa. The laboratory simulated deep-sea results showed that, within 5-20 d of test cycle, the coating resistance values in the initial stage were above 1010 Ω.cm2 with the coating capacitance values of 10‒10 F/cm2 orders of magnitude. With the tests proceeding, the coating resistance values decreased, and the capacitance values increased. And for the simulated 3 000 m conditions, the coating resistance values declined sharply from the initial 3.995×1010 Ω.cm2 to 3.264×107 Ω.cm2. The results of static water pressure effect showed that the coating resistances gradually decreased and the water absorption percentages increased with the pressure increasing. In the later stage, the coating resistance values were 3.044×1010 Ω.cm2, 4.305×109 Ω.cm2 and 3.264×107 Ω.cm2, and the water adsorption of the coatings was 4.32%, 8.09% and 15.84% respectively. It is concluded that the water absorption of coatings immersed for the same period of time in the initial stage is nearly doubled with every increase of 1 000 m depth in the 1 000-3 000 m deep-sea environment. |
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