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| Defect Detection of Metal Structure with Anticorrosive Coating Based on Capacitive Imaging Technology |
| Received:March 21, 2015 Revised:August 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.08.001 |
| KeyWord:capacitive imaging technology metal surface defects anticorrosive coating defects detection system |
| Author | Institution |
| LI Zhen |
China University of Petroleum Center for Offshore Engineering and Safety Technology, Qingdao , China |
| CHEN Guo-ming |
China University of Petroleum Center for Offshore Engineering and Safety Technology, Qingdao , China |
| GU Yue |
China University of Petroleum Center for Offshore Engineering and Safety Technology, Qingdao , China |
| LI Chen |
China University of Petroleum Center for Offshore Engineering and Safety Technology, Qingdao , China |
| YIN Xiao-kang |
China University of Petroleum Center for Offshore Engineering and Safety Technology, Qingdao , China |
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| Abstract: |
| Objective To detect defects of metal structure with anticorrosive coating and defects of anticorrosive coating at the same time. Methods Capacitive imaging detection technique was used to detect defects of metal structure with anticorrosive coating and defects of anticorrosive coating at the same time. The variation of the electric field line under defects of metal structure with anticorrosive coating and defects of anticorrosive coating was analyzed theoretically, and the variation of the electric potential line under defects of metal structure with anticorrosive coating and defects of anticorrosive coating was analyzed by simulation. The feasibility of using capacitive imaging detection technique to detect defects of metal structure with anticorrosive coating and defects of anticorrosive coating was discussed. A capacitive imaging detection system was constructed to detect defects of 1 mm and 2 mm on the metal surface under 2 mm and 4mm anticorrosive coating, the pit surface defects on the metal surface under the anticorrosive layer of 2 mm and 4 mm, and the metal structure under the 2 mm anticorrosion coating (including the through hole defect in the anticorrosive layer). Results Theoretical analysis and simulation analysis showed that the capacitive imaging technology had the feasibility of detecting the surface defects of metal structure with the anticorrosion coating and defects of anticorrosive coating. The test results showed that capacitive imaging technique could detect defects of metal structure with anticorrosive coating and defects of 1 mm and 2 mm on the metal surface under 2mm and 4mm anticorrosive coating, the pit surface defects on the metal surface under the anticorrosive layer of 2 mm and 4 mm, and the metal structure under the 2 mm anticorrosion coating (including the through hole defect in the anticorrosive layer). In addition, the detection results of the metal surface defects with the anticorrosion layer showed a rising trend, and the detection results in defects of the anticorrosion layer showed a downward trend. According to this rule, defects of metal structure with anticorrosive coating and defects of anticorrosive coating could be distinguished. Conclusion The capacitive imaging detection technology can detect the surface thinning defects and pits defects of the metal structure under anticorrosion and defects of the anticorrosion layer itself at the same time. According to the different results of the metal structure surface defect and the anticorrosion layer defect under the anticorrosion layer, the detection results can be used to distinguish these two kinds of defects. It is favorable for developing reasonable plans for repair of defects of petroleum storage and transportation facilities. |
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