| TAN Xiao-ming,ZHAN Gui-pan,ZHANG Dan-feng,PENG Zhi-gang,WANG De.Corrosion Electrochemical Behaviour of PCB-ENIG in Accelerated Test Environment[J],50(10):345-352 |
| Corrosion Electrochemical Behaviour of PCB-ENIG in Accelerated Test Environment |
| Received:October 15, 2020 Revised:March 16, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.10.036 |
| KeyWord:PCB-ENIG electrochemical impedance resonance micro area electrochemistry scanning Kelvin probe technology corrosion electrochemical behavior |
| Author | Institution |
| TAN Xiao-ming |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| ZHAN Gui-pan |
The Third Military Representative Office of the Department of Naval Equipment in Beijing, Beijing , China |
| ZHANG Dan-feng |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| PENG Zhi-gang |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| WANG De |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
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| Abstract: |
| To studythe corrosion electrochemical behavior of electroless nickel gold printed circuit board (PCB-ENIG) in marine atmospheric environment of shipboard aircraft. Based on the measured environmental data, the accelerated corrosion test environmental spectrum suitable for electronic equipment was compiled, and the accelerated corrosion test research was carried out under laboratory conditions. And the electrochemical workstation was used to test and analyze the electrochemical impedance spectroscopy of the samples. The electrochemical behavior of PCB-ENIG was analyzed by using the reciprocal of charge transfer resistance 1/Rct as the characterization parameter of corrosion rate. The voltage potential distribution on the surface of PCB-ENIG was measured by Scanning Kelvin Probe technology (SKP), and the micro electrochemical characteristics of PCB-ENIG were characterized by potential mean μ and standard deviation s. The charge transfer resistance Rct was from 217.43 kΩ.cm2 to 283.41 kΩ.cm2 in the 0th~1st cycle, and the corrosion rate decreased slightly. At this time, the micro hole corrosion mainly occurred. With the extension of the corrosion cycle, the corrosion products attached to the surface of the micro pores appeared cracking and spalling, and the blocking effect on the corrosion medium was weakened. In the 1st~4th cycle, the radius of the impedance arc decreased and the corrosion rate increased. In the 4th cycle, Rct reached the minimum, which was only 44.62 kΩ.cm2, the corrosion rate reached the maximum, and the average surface potential μ decreased to −381.37 mV and s increased to 55.52. The results showed that there were obvious anode and cathode, and the corrosion tendency was large. In the 5th~7th cycle, the corrosion was aggravated, and the surface corrosion products accumulated and increased continuously, forming a thick corrosion product layer, and the corrosion rate decreased continuously. In the 7th cycle, the charge transfer resistance reached the maximum, which was 311.31 kΩ.cm2. At this time, the average surface potential increased to −256.45 mV, the potential standard deviation was large and the potential distribution was relatively scattered, which indicated that the accumulation of corrosion products would reduce the corrosion rate. The Kelvin potential of micro area on PCB-ENIG surface obeys normal distribution in different corrosion cycles. With the increase of accelerated corrosion time, the corrosion rate of PCB-ENIG decreases, increases and decreases. |
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