高溫無鉛銲料在3.5% NaCl溶液之電化學腐蝕行爲

Electrochemical Corrosion Behavior of High Temperature Pb-free Solders in 3.5% NaCl Solution

蔡齊航(Chi-Hang Tsai) ； 宋振銘(Jenn-Ming Song) ； 傅彥培(Yen-Pei Fu)

《防蝕工程》 24卷3期 (2010/09) Pp. 193-200

https://doi.org/10.6376/JCCE.201009.0193

摘要

This study aimed at investigating the electrochemical corrosion behavior of novel Pb-free solders. Bi-11 wt.% Ag and Zn-40 wt.% Sn, in 3.5% NaCl solutions using the potentiodynamic polarization method with scanned potentials ranging from -2000mV to +2000mV. A Pb-5wt.% Sn alloy was also examined for comparison. Experimental results showed that the order of the selected solders in terms of corrosion potential (E(subscript corr)) from noble to active was Bi-11Ag, Pb-5Sn, and Zn-40Sn. The corrosion current density (i(subscript corr) of Zn-40Sn was the highest, and that of Pb-5Sn was the lowest. The Ph-5Sn sample had a more extended passive region compared to Bi-11Ag, while the Zn-40Sn sample did not showed passive behavior within the scanned potential range. According to the XPS and XRD data, the corrosion products were mainly PbCl2 and PbO for Pb-5Sn and BiOCl, AgCl2, and Bi2O3 for Bi-11Ag. Zn rich phases (ZnO and ZnCl2) were found on the polarized surface of Zn-40Sn, and tin oxides were detected at the subsurface. It was also demonstrated that an addition of Ag led to an increase in passivation ability of Bi, which could he ascribed to the ductile Ag-rich nodules embedded in the Bi matrix. The matrix was then capable of accommodating compressive stresses stemming from the formation of passive films and thus preventing an early loss of passivity.

關鍵字

電化學腐蝕 ； 高溫無鉛銲料

並列摘要

This study aimed at investigating the electrochemical corrosion behavior of novel Pb-free solders. Bi-11 wt.% Ag and Zn-40 wt.% Sn, in 3.5% NaCl solutions using the potentiodynamic polarization method with scanned potentials ranging from -2000mV to +2000mV. A Pb-5wt.% Sn alloy was also examined for comparison. Experimental results showed that the order of the selected solders in terms of corrosion potential (E(subscript corr)) from noble to active was Bi-11Ag, Pb-5Sn, and Zn-40Sn. The corrosion current density (i(subscript corr) of Zn-40Sn was the highest, and that of Pb-5Sn was the lowest. The Ph-5Sn sample had a more extended passive region compared to Bi-11Ag, while the Zn-40Sn sample did not showed passive behavior within the scanned potential range. According to the XPS and XRD data, the corrosion products were mainly PbCl2 and PbO for Pb-5Sn and BiOCl, AgCl2, and Bi2O3 for Bi-11Ag. Zn rich phases (ZnO and ZnCl2) were found on the polarized surface of Zn-40Sn, and tin oxides were detected at the subsurface. It was also demonstrated that an addition of Ag led to an increase in passivation ability of Bi, which could he ascribed to the ductile Ag-rich nodules embedded in the Bi matrix. The matrix was then capable of accommodating compressive stresses stemming from the formation of passive films and thus preventing an early loss of passivity.

並列關鍵字

Electrochemical corrosion ； High temperature Pb-free solders