Abstract
The microstructure of Sn–8Zn–3Bi alloy was refined by increasing the solidification rate and the correlation between Zn-rich phase and the corrosion/oxidation behavior of the alloy was investigated. The Zn-rich phase transforms from coarse flakes to fine needles dispersed in the β-Sn matrix with the increase of the cooling rate. The transformation of Zn-rich precipitates enhances the anticorrosive ability of Sn–8Zn–3Bi alloy in 3.5 wt.% NaCl solution. On the contrary, Sn–8Zn–3Bi alloy with a fine needle-like Zn-rich phase shows poor oxidation resistance under air atmosphere, due to the fast diffusion of Zn atoms in Sn matrix.
Highlights
Sn–Pb alloys have long been extensively used in microelectronic packaging industries due to their good wettability, excellent physical properties, low cost and low melting point [1]
Zn-rich phase and the corrosion/oxidation behavior of the Sn–8Zn–3Bi alloy. These results provide crucial experimental input as a guide for fabricating Sn–Zn–Bi alloys in various harsh environments. It may be of reference value for researching the corrosion/oxidation behavior of other lead-free
Corrosion test was performed with samples in 3.5 wt.% NaCl solution, and its results were evaluated according to weight loss loss measurement
Summary
Sn–Pb alloys have long been extensively used in microelectronic packaging industries due to their good wettability, excellent physical properties, low cost and low melting point [1]. Their microstructures, mechanical properties and solderability have been reported [3,4,5,6,7,8,9,10] Among these lead-free solder alloys, the Sn–Zn based solder alloy has been found to be a promising candidate to replace the existing Sn–Pb eutectic solder, due to its relatively low melting temperature, superior mechanical properties at room temperature and relatively low cost [11,12,13,14,15]. Zn-rich phase and the corrosion/oxidation behavior of the Sn–8Zn–3Bi alloy These results provide crucial experimental input as a guide for fabricating Sn–Zn–Bi alloys in various harsh environments. It may be of reference value for researching the corrosion/oxidation behavior of other lead-free
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