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| Corrosion of Avionics Connectors in Reef Environment and Its Effect on Signal Transmission |
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| DOI：10.7643/issn.1672-9242.2023.04.007 |
| KeyWord:reef environment avionics connectors corrosion contact resistance electrical contact model signal transmission |
| Author | Institution |
| XU Zhen-xiao |
Naval Aviation University, Shandong Yantai , China |
| YU Da-zhao |
Naval Aviation University, Shandong Yantai , China |
| LIU Qi |
Naval Aviation University, Shandong Yantai , China |
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| Abstract: |
| The work aims to study the corrosion characteristics and laws of avionics connectors in the reef environment of the South China Sea through the accelerated corrosion test and on this basis, explore the effect of corroded avionics connectors on signal transmission. According to the reel environment characteristics of the South China Sea, the environmental spectrum of accelerated corrosion test was designed. Based on this environmental spectrum, the accelerated corrosion test was carried out to observe the corrosion morphology of avionics connectors in different test cycles, measure their contact resistance, and study the corrosion mechanism. Then, the circuit was designed to measure the waveform characteristics of square wave signal passing through avionics connectors with different degrees of corrosion, and the effect of corrosion on signal transmission was studied through comparative analysis. After 5 corrosion cycles, micro holes began to appear on the pin surface of the avionics connectors, and the contact resistance was between 3 and 11 mΩ. After 10 cycles, the number of micro holes on the pin surface and the pit corrosion depth both increased, and the contact resistance was between 7 and 19 mΩ. After 15 cycles, part of the gold coating on the pin surface fell off, and the contact resistance was between 15 and 36 mΩ. The deeper the corrosion degree of the avionics connectors, the greater the measured value of the signal phase difference, rise time and overshoot. As the signal frequency increased, these three measurement parameters also increased correspondingly. Salt spray and alternating damp heat stress environment have obvious corrosion effects on the contact surface of avionics connectors. Wet salt mist invading the interior of the avionics connectors is the direct cause of the increase in contact resistance. Contact resistance cannot fully reflect the effect of corrosion on signal transmission. When the contact resistance is small, the greater the corrosion degree of the avionics connectors, the more obvious the signal distortion and the higher the signal frequency, the more obvious the signal distortion. |
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