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Corrosion Behavior of Silver-Plated Circuit Boards in a Simulated Marine Environment with Industrial Pollution

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
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Materials 2017, 10(7), 762; https://doi.org/10.3390/ma10070762
Received: 3 June 2017 / Revised: 29 June 2017 / Accepted: 3 July 2017 / Published: 6 July 2017
The electrochemical corrosion behavior of a silver-plated circuit board (PCB-ImAg) in a polluted marine atmosphere environment (Qingdao in China) is studied through a simulated experiment. The morphologies of PCB-ImAg show some micropores on the surface that act as the corrosion-active points in the tests. Cl mainly induces microporous corrosion, whereas SO2 causes general corrosion. Notably, the silver color changes significantly under SO2 influence. EIS results show that the initial charge transfer resistance in the test containing SO2 and Cl is 9.847 × 103, while it is 3.701 × 104 in the test containing Cl only, which demonstrates that corrosion accelerates in a mixed atmosphere. Polarization curves further show that corrosion potential is lower in mixed solutions (between −0.397 V SCE and −0.214 V SCE) than it in the solution containing Cl only (−0.168 V SCE), indicating that corrosion tendency increases with increased HSO3 concentration. View Full-Text
Keywords: silver-plated circuit boards; simulated polluted environment; electrochemical impedance spectroscopy; potentiodynamic polarization curves silver-plated circuit boards; simulated polluted environment; electrochemical impedance spectroscopy; potentiodynamic polarization curves
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Xiao, K.; Yi, P.; Yan, L.; Bai, Z.; Dong, C.; Dong, P.; Gao, X. Corrosion Behavior of Silver-Plated Circuit Boards in a Simulated Marine Environment with Industrial Pollution. Materials 2017, 10, 762.

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