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| Experimental Study on Performances of Protection Systems Used for a Certain Type of Aircraft |
| Received:January 17, 2017 Revised:March 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.03.015 |
| KeyWord:protection system salt spray test Al alloy structural steel |
| Author | Institution |
| LI Chao |
AVIC GeneralHuananAircraft Industry Co., Ltd, Zhuhai , China |
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| Abstract: |
| Objective To select a protection system of good corrosion resistance through salt spraycomparisontest. Methods Several alternative protection systems with two structural materials (2024, 30CrMnSiA) commonly used in aircraft were selected to carry out salt spray accelerated corrosion test. Results After 10 cycles of test, the coatings of Al alloy specimens bubbled and failed, but the substrate remained uncorroded; after 7 cycles of test, the coatings of structural steel specimens flaked and failed, and the substrate was corroded in the prefabricated scratches. Conclusion Al alloy external protection system—scheme B (chromate anodizing + 37 primer + E finish) and the internal protection system—scheme H (chromate anodizing + TB06 primer) outperform the other schemes. It is recommended to apply scheme GE (cadmium plating + passivation + TB06 primer + TS96 finish) for structural steel. |
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