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| Corrosion Failure Analysis and Preventive Measure of a Type of Helicopter Tail Gearbox Casing Assembly |
| Received:September 15, 2014 Revised:December 15, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10. 7643 / issn. 1672-9242. 2014. 06. 018 |
| KeyWord:helicopter tail gearbox casing assembly corrosion |
| Author | Institution |
| LI Zong-yuan |
General Staff Department Army Aviation Institute, Beijing , China |
| LI Jian |
General Staff Department Army Aviation Institute, Beijing , China |
| SHI Jin-da |
General Staff Department Army Aviation Institute, Beijing , China |
| GAO Yan-da |
General Staff Department Army Aviation Institute, Beijing , China |
| SHEN Jun |
General Staff Department Army Aviation Institute, Beijing , China |
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| Abstract: |
| Objective To analyze the cause for a type of helicopter tail gearbox casing assembly corrosion and to establish a preventive measure. Methods Through the analysis of basic information on corrosion failure, corrosion location structure, material and appearance, we concluded the cause for the corrosion and established the preventive measure with an insitu treatment. Results There were dissimilar metal contact and concave structure on the fitting surface of the type of tail gearbox, and corrosion occurred easily under cyclic loading. The army field maintenance could only delay the corrosion process through inspection and monitoring. To solve the problem, wet assembly of sealant processing techniques and blot surface preventive strengthening were required. Conclusion With in-situ tail gearbox casing assembly fitting surface wet assembly and blot surface preventive strengthening, it was able to prevent electrolyte from infiltrating the fitting hole, and to achieve the purpose of corrosion prevention. |
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