Abstract
The corrosion resistance of Sn–0.3Ag–0.9Zn alloy solidified under different cooling rates in 3.5 wt% NaCl solution was evaluated based on potentiodynamic polarization, electrochemical impedance spectroscopy and electrochemical noise. It is found that the corrosion resistance of this alloy improves with the increase of the applied cooling rate, which is attributed to the distinct microstructure. The furnace-cooled and air-cooled alloy with active Zn-rich phase and a microstructure formed by a coarser dendritic array associated with larger size of AgZn3 intermetallic compounds exhibit a worse corrosion resistance due to a serious galvanic corrosion. Besides, the Mott–Schottky measurement and the X-ray photoelectron spectroscopy were performed to analyze the semiconductor properties and composition of the passive film formed on the surface of the alloy. It confirms that the stability and protective ability of the passive films formed on furnace-cooled and air-cooled alloy are worse than that of water-cooled alloy due to their higher oxygen vacancy defects and concentration of unstable SnO. Furthermore, the major corrosion product on the surface of the Sn–0.3Ag–0.9Zn alloys is tin oxide chloride hydroxide.
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Acknowledgments
The authors are grateful to the China National Funds for Distinguished Young Scientists (Granted No. 51325401), the China National Funds (Granted No. 51131007), the Major State Basic Research Development Program (973 Program) (Granted No. 2014CB046805), the Key Project of Natural Science Foundation of Tianjin (Granted No. 13JCZDJC31900 and 14JCZDJC38700) for grant and financial support.
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Wang, H., Gao, Z., Liu, Y. et al. Evaluation of cooling rate on electrochemical behavior of Sn–0.3Ag–0.9Zn solder alloy in 3.5 wt% NaCl solution. J Mater Sci: Mater Electron 26, 11–22 (2015). https://doi.org/10.1007/s10854-014-2356-6
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DOI: https://doi.org/10.1007/s10854-014-2356-6