| Citation: | TAN Xiangfei, HE Yuting, HOU Bo, et al. Metal structure crack monitoring based on copper film sensor in corrosion environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(7): 1433-1441. doi: 10.13700/j.bh.1001-5965.2016.0534(in Chinese)
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In the process of monitoring aircraft metal structure crack, copper film sensor is exposed to atmospheric corrosion environment. The corrosion resistance of copper film sensor and crack monitoring performance after corrosion experiment were researched under the background. First, copper films were deposited by pulsed bias arc ion plating technique at difference levels of current and negative substrate bias. The corrosion resistance was researched. The result shows that the optimal corrosion resistance of copper film was deposited at level of current 60 A and negative substrate bias 250 V. Then, a concentric ring copper film sensor array was deposited on 2A12-T4 aluminum alloy using the optimal depositing parameter. A salt-spray environment experiment was carried out. Finally, a fatigue crack monitoring experiment was carried out using the copper film sensor which was exposed in corrosion environment. The results show that the copper film sensor has good corrosion resistance. The corrosion resistance time reaches 1 000 h. The copper film sensor is very sensitive to fatigue crack and can realize quantitative monitoring with the accuracy of 1 mm. Besides, the monitoring results are repeatable.
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