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| Electrochemical Corrosion Behaviors of the Galvanic Couple Cu/Sn63-Pb37 in simulated atmosphere |
| ;Chuanwei Yan; |
| 中国科学院金属研究所金属腐蚀与防护国家重点实验室 |
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Abstract The Cu/Sn63-Pb37 galvanic couple appeared in most electronic devices. This paper was to investigate the corrosion characteristics and mechanisms of this couple, which was exposed in the typically simulated air condition at 40?C with 95%RH. The in-situ electrochemical information of the couple have been performed with related zero resistance ampere techniques under thin moisture film. According to the time dependent features of galvanic potential and anodic galvanic current density results, the Cu acted as anode and the Sn63-Pb37 acted as cathode during exposure. The gradual formed corrosion products, which were detected by FT-IR and XRD, restrained the anodic polarization behavior occurring on Cu surface. The hydrolyzed CO2 on the Sn63-Pb37 surface induced the breakdown of Pb oxides formed in air naturally, which was confirmed from the SEM surface morphologies.
Despite the exact corrosion rates was not obtained from the galvanic current density data, the changing trend were valuable for estimating the atmospheric corrosion behavior of the Cu/Sn63-Pb37 couple.
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Received: 27 April 2006
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