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| Degradation of Protective Properties of Organic Coatings on Typical Helicopter Skin Structure in Simulated Plateau Atmospheric Environment |
| Received:November 06, 2016 Revised:March 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2017.03.002 |
| KeyWord:organic coatings corrosion resistance laboratory accelerated testing helicopter |
| Author | Institution |
| LUO Chen |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing ,China |
| LI Zong-yuan |
Army Aviation Institute, Beijing ,China |
| SUN Zhi-hua |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing ,China |
| TANG Zhi-hui |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing ,China |
| LI Jian |
Army Aviation Institute, Beijing ,China |
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| Abstract: |
| Objective To evaluate protective properties of typical helicopter skin structure and its protection system that serves in plateau atmospheric environment. Methods The damage in the protective system of typical helicopter skin structures in service was reproduced via accelerated testing method for simulation of plateau atmospheric environment. Scanning electron microscopy was employed to observe the surface micro morphology. Electrochemical impedance measurement was used to study the degradation of impedance of organic coatings. Results During laboratory accelerated testing, localized corrosion preferentially initiated at the periphery of bolts in the skin specimen but then the corrosion product gradually disappeared. In the periphery of rivets, corrosion product did not accumulate significantly after a number of cycles. The electrochemical impedance modulus of the organic coatings in the central area between bolts decreased remarkably after 8 cycles. The electrochemical impedance modulus of the organic coatings in the central area between rivets repeatedly shows obvious decrease during testing. Conclusion Organic coating around rivets shows the capability to block corrosive media after a several cycles of accelerated testing. Compared with the situation on bolt structure, the organic coating in the central area between rivets exhibits distinct degradation in protective properties. |
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