| TAN Xiao-ming,ZHAN Gui-pan,ZHANG Dan-feng,PENG Zhi-gang,WANG An-dong.Effects of Water-displacing Corrosion Preventive Compound on Corrosion Behavior of Printed Circuit Board and Mechanism[J],50(9):311-321 |
| Effects of Water-displacing Corrosion Preventive Compound on Corrosion Behavior of Printed Circuit Board and Mechanism |
| Received:August 15, 2020 Revised:November 17, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.033 |
| KeyWord:printed circuit board water-displacing corrosion preventive compound (CPC) accelerated corrosion testing contact resistance insulation resistance corrosion mechanism |
| Author | Institution |
| TAN Xiao-ming |
Qingdao Branch Campus of Naval Aeronautical University, Qingdao , China |
| ZHAN Gui-pan |
Qingdao Branch Campus of Naval Aeronautical University, Qingdao , China |
| ZHANG Dan-feng |
Qingdao Branch Campus of Naval Aeronautical University, Qingdao , China |
| PENG Zhi-gang |
Qingdao Branch Campus of Naval Aeronautical University, Qingdao , China |
| WANG An-dong |
Qingdao Branch Campus of Naval Aeronautical University, Qingdao , China |
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| Abstract: |
| The work aims to analyze the effect and mechanism of Super CORR-A water-displacing corrosion preventive compound (CPC) on the corrosion behavior of typical printed circuit board. Based on the measured environmental data of electronic equipment cabin of shipboard aircraft, the environmental spectrum of accelerated corrosion test is compiled, considering the humidity, heat, salt fog and acid atmosphere sensitive to PCB corrosion. Fourteen cycles of accelerated corrosion tests are carried out for PCB which are not sprayed or sprayed with corrosion preventive compound. The corrosion behaviors of printed circuit boards are characterized by macroscopic and microscopic corrosion morphology, corrosion size, contact resistance and insulation resistance. The effects of corrosion preventive compound on the corrosion of printed circuit boards are analyzed. The mechanism of corrosion protection is revealed by scanning Kelvin probe technique and infrared spectroscopy. The results show that, without corrosion, the corrosion preventive compound increases the contact resistance of PCB by 0.075%~0.224%, and decreases the insulation resistance by 1.99%~4.12%. The corrosion inhibitor has little effect on its electrical performance. For the PCB without corrosion preventive compound, in the 3rd cycle, the typical local corrosion phenomenon occurs; in the 5th, 80% of the pad area is corroded; in the 14th cycle, the original gloss of the substrate was lost, the pad is completed corroded. The surface is covered with a thick layer of corrosion, and the through-hole was covered by reddish brown corrosion products. For the PCB sprayed with corrosion preventive compound, the corrosion degree is obviously lighter. In the 14th cycle, the connector appears obvious corrosion, and there are light green corrosion products inside. In the 14th cycle, the maximum corrosion depth and width of PCB pad sprays with corrosion preventive compound are only 52.5% and 24.3% of that of the untreated one. In the 0~5th cycle, the contact resistance difference between spraying and not spraying corrosion preventive compound is small; in the 5th~14th cycle, the contact resistance difference between spraying and not spraying corrosion preventive compound gradually increases. And at the 14th cycle, the corrosion preventive compound makes the change of contact resistance of PCB decreases by 57.20%~82.87%. After the corrosion test, the insulation resistance of PCB sprayed with corrosion preventive compound remains above 12.5 GΩ, which still has good insulation performance. However, the insulation resistance of PCB without spraying corrosion preventive compound changed greatly. After 14th cycle of corrosion, the insulation resistance decreased by 2 orders of magnitude compared with the 0 cycle, being only 0.66~1.75 GΩ, and basically reached the failure state.Therefore, the Super CORR-A corrosion preventive compound has little effect on the initial electrical performance of PCB. The corrosion preventive compound contains many functional groups, and has good water displacement ability, permeability and film-forming ability. which can effectively inhibit and slow down the corrosion of PCB and effectively extend its service life. |
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