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Cerium–lanthanum mixed rare earth (RE) (0.5 wt.%) was added to Zn-20Sn high-temperature lead-free solder to study the effect of RE on the solder properties. The Zn-20Sn-0.5RE solder has a better corrosion resistance than that of Zn-20Sn alloy. RE addition increases the γ-Cu5Zn8 layer thickness, promotes growth of a ε-CuZn5 layer shaped like bamboo shoots, and increases the roughness of the ε-CuZn5...
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