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| Environmental Damage Effect and Mechanism of Capacitive Humidity Sensor under the Coupling of Temperature-Humidity-Salt Spray |
| Received:November 10, 2022 Revised:December 26, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.07.020 |
| KeyWord:capacitive humidity sensor temperature-humidity-salt spray accelerated aging environmental damage damage mechanism |
| Author | Institution |
| LI Han |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China;Mohe Material Atmospheric Corrosion Station of National Outdoor Scientific Observation and Research, Heilongjiang Mohe , China |
| WEI Xiao-qin |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China;Mohe Material Atmospheric Corrosion Station of National Outdoor Scientific Observation and Research, Heilongjiang Mohe , China |
| DENG Jia-wei |
Military Representative Office of Army Equipment Department in Chongqing, Chongqing , China |
| TENG Jun-peng |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| ZHAO Yang |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China;Mohe Material Atmospheric Corrosion Station of National Outdoor Scientific Observation and Research, Heilongjiang Mohe , China |
| ZHAO Fang-chao |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| LIU Shi-xiang |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| ZHOU Xue-peng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LIU Wei |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
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| Abstract: |
| The work aims to study the degradation law and failure mechanism of capacitive humidity sensor under the coupling environment of temperature-humidity-salt spray. The capacitive humidity sensor was placed in the three-factor (85 ℃ + 85%RH → 40 ℃ + 0.05%NaCl neutral salt spray → 35 ℃ + 50%RH drying) cycle environment for accelerated aging test and sampled regularly to analyze the degradation law of response time and measurement accuracy and study the environmental damage mechanism of temperature-humidity-salt spray on capacitive humidity sensor. After aging for 7 days in the three-factor environment, the humidity sensor in the standard humidity (> 50%RH) environment had abnormal induction. After aging for 14 days, the humidity sensor in every standard humidity environment had abnormal induction. When the humidity sensitive capacitor was tested, it was found that the capacitance was rather large, the insulation resistance was rather small, and the loss angle tangent was rather large, which determined the failure of the humidity sensitive capacitor. In temperature-humidity-salt spray environment, particles deposited on the surface of humidity sensitive material in salt spray phase. In drying stage, moisture volatilized and irregular particles formed on the surface of humidity sensitive material, which reduced the insulation performance of humidity sensitive capacitor. In the current test, irregular particles were prone to generating power at the tip under the action of electric field, which degraded the insulation performance of humidity sensitive material, accompanied by corrosion, breakdown and ablation, and eventually the failure of humidity sensitive capacitor. When humidity sensor is in temperature-humidity-salt spray environment, salt particles are easy to adhere to the humidity sensitive material and breakdown and ablation occur in the current environment, resulting in the function failure of humidity sensor. |
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