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| Life Prediction of Carbon Steel Protective Coating in Inner Compartment of Seawater Desalination Plant |
| Received:April 26, 2020 Revised:June 10, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.12.019 |
| KeyWord:desalination simulated accelerated test anticorrosive coating life prediction |
| Author | Institution |
| ZHANG Li-li |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China |
| WANG Yue-ping |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China |
| CHEN Kai-feng |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China;Science and Technology on Marine Corrosion and Protection Laboratory, Qingdao , China |
| ZHA Xiao-qin |
Luoyang Ship Material research Institute ,Luoyang , China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipment, Luoyang , China |
| WANG Jing-jing |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China;Science and Technology on Marine Corrosion and Protection Laboratory, Qingdao , China |
| ZHANG Xin-yue |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China |
| LIANG Yu |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China;Science and Technology on Marine Corrosion and Protection Laboratory, Qingdao , China |
| QI Hai-xia |
Xiamen Branch of Luoyang Ship Material research Institute, Xiamen , China;Science and Technology on Marine Corrosion and Protection Laboratory, Qingdao , China |
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| Abstract: |
| The work aims to obtain the heat-resistant aging life of the carbon steel protective coating in the inner compartment of seawater desalination plant. The temperature and pressure of the equipment were adjusted to simulate the working environment of the low-temperature multi-effect evaporator. Soaking acceleration test of 20 months was conducted. The thermal aging life of the coating was predicted by extrapolating the empirical formula on the basis of the change of coating adhesion with aging time, the change of coating color, the change of coating morphology before and after soaking, and the coating impedance value. The failure phenomena such as blister, rust, cracking and peeling were not found on the coating surface after 20 months of hanging test. The variation trend of color difference of coating surface was relatively stable. The dry adhesion of the coating was 10.9 MPa, and the adhesion was 8.95 MPa after 20 months of test. Under 0.01 Hz low frequency impedance (|Z|0.01 Hz), its electrochemical impedance value changed from 1.8×108 Ω.cm2 to 7.9×106 Ω.cm2. The order of magnitude of coating impedance was decreased, but was still within the scope of effective protection. The thermal aging life of carbon steel protective coating in the inner compartment of seawater desalination plant was predicted to be 13.33 years by extrapolating the aging empirical formula. The interior protective coating of seawater desalination plant has the function of long life thermal aging and anti-corrosion. |
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