腐蚀环境下铜薄膜传感器金属结构裂纹监测

铜薄膜传感器在飞机金属结构损伤监测过程中,将长期面临大气腐蚀环境的影响。针对此背景,研究了铜薄膜传感器在腐蚀环境下的耐蚀性能,及腐蚀后的疲劳裂纹监测性能。首先,采用脉冲偏压多弧离子镀技术在不同弧电流和基体负偏压水平下制备了一系列铜薄膜,对其耐蚀性能进行了对比研究。结果表明,在弧电流60 A和基体负偏压250 V时沉积的铜薄膜耐蚀性能最佳。然后,结合耐蚀性能最佳的沉积工艺参数,在2A12-T4铝合金中心孔板试件上制备了同心环状铜薄膜传感器阵列,并开展了盐雾腐蚀试验。最后,对腐蚀试验后的铜薄膜传感器进行了疲劳裂纹监测试验。结果表明:铜薄膜传感器在腐蚀环境下具有良好的耐蚀性能,耐蚀时间达1 000 h;腐蚀试验后的铜薄膜传感器对裂纹变化敏感,能实现对裂纹定量监测,监测精度为1 mm,监测结果具有良好的可重复性。

Metal structure crack monitoring based on copper film sensor in corrosion environment

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.