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| Experimental Study on PCB Protection in Damp and Hot Salt Fog Atmospheric Environment |
| Received:November 25, 2023 Revised:January 27, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.03.019 |
| KeyWord:damp and hot salt fog shed environment PCB three-proofing paint coating protection environmental adaptability |
| Author | Institution |
| ZHONG Wenan |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
| WANG Honglun |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
| ZHANG Dongjiu |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
| CHEN Shaojiang |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
| YANG Degang |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
| CAI Hui |
Key Laboratory of Space Launching Site Reliability Technology, XSLC, Haikou , China |
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| Abstract: |
| The work aims to study the environmental adaptability of PCB with different protection processes in a damp and hot salt fog atmospheric environment. Combined with unprotected specimens, the exposure test of PCB with four kinds of protection technology was carried out in shed environment near the sea. The performance of the protection technology of PCB was evaluated by the appearance, insulation resistance, dielectric voltage resistance, quality factor, scanning electron microscopy, energy spectrum analysis and other technical means. In the shed environment near the sea, the PCB without protective treatment was seriously corroded, and its electrical performance was also significantly reduced. The modified silicone and organosilicon PCB had mild corrosion and good electrical properties during the whole test period. The PCB protective performance of acrylic three-proofing paint protection was unstable, and the PCB was corroded. The quality factor of acrylic three-proofing paint was lower than that of modified silicon and organic silicon three-proofing paint. The electrical test performance of the PCB protected by polyurethane three-proofing paint was good, but the coating had too much damage, foaming and other defects, the copper wire had abnormal rust phenomenon, and the dielectric voltage test had a breakdown state in multiple cycles. For the PCB in the damp and hot salt fog environment in the shed environment near the sea, it is recommended that silicone and modified silicon be coated with three-proofing paint as protection means. |
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