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Influence of cobalt content on microstructure and corrosion performance of extruded Sn-9Zn solder alloys

钴含量对挤压 Sn-9Zn 焊料合金显微组织与腐蚀性能的影响

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Abstract

The Pb-free solders have attracted a great deal of attention recently due to the environmental concerns. The present work focuses on the effect of cobalt content (0, 0.5 and 3.0) on the microstructural characteristics, melting point and corrosion performance of extruded Sn-9Zn solder alloys. The results reveal that the Zn-rich precipitates with spherical or needle-like shape in the Sn-9Zn-xCo alloys are refined remarkably by forming the γ-Co5Zn21 and Co2Sn2Zn Co-contained intermetallic compounds, though the melting point and eutectic reaction temperature decrease slightly. It is suggested that the corrosion property of the extruded Sn-9Zn-xCo alloys is improved significantly by adding the cobalt element, while the content should be controlled reasonably. Combining the corrosion morphology, the influence of cobalt content on the corrosion behavior of the Sn-9Zn-xCo alloys is analyzed in terms of the refined microstructure and the enhanced passive film stability.

摘要

环境保护已成为当前发展的重要议题, 无铅焊料最近得到广泛的关注。本文主要研究钴含量(0、0.5 和3.0)对挤压Sn-9Zn 焊料合金的显微组织、熔点和腐蚀性能的影响。结果表明, 通过形成γ-Co5Zn21 和Co2Sn2Zn 金属间化合物, Sn-9Zn-xCo 合金中球形或针状富锌析出相得到显著细化, 但熔点和共晶 反应温度略有降低。通过添加钴元素可明显改善Sn-9Zn-xCo 挤压合金的抗腐蚀性能, 但应合理控制 其含量。结合腐蚀形态, 从显微组织细化和钝化膜稳定性增强方面, 分析钴含量对Sn-9Zn-xCo 合金 腐蚀行为的影响。

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Authors and Affiliations

  1. Nanjing Research Institute of Electronics and Technology, Nanjing, 210039, China

    Shou-li Jiang  (江守利) & Jian-feng Zhong  (钟剑锋)

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Jia-yuan Li  (李佳原), Ri-chu Wang  (王日初), Chao-qun Peng  (彭超群) & Zhi-yong Cai PhD  (蔡志勇) (Associate Professor)

  3. Key Laboratory of Electronic Packaging and Advanced Functional Materials, Changsha, 410083, China

    Ri-chu Wang  (王日初) & Zhi-yong Cai PhD  (蔡志勇) (Associate Professor)

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  1. Shou-li Jiang  (江守利)
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  2. Jian-feng Zhong  (钟剑锋)
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  3. Jia-yuan Li  (李佳原)
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  6. Zhi-yong Cai PhD  (蔡志勇)
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Correspondence to Zhi-yong Cai PhD  (蔡志勇).

Additional information

Foundation item: Project(2017YFB0305700) supported by the Ministry of Science and Technology of China; Projects (51490660, 51490664) supported by the National Natural Science Foundation of China; Project(2017YFB0305700) supported by the National Key Research and Development Project of China

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Jiang, Sl., Zhong, Jf., Li, Jy. et al. Influence of cobalt content on microstructure and corrosion performance of extruded Sn-9Zn solder alloys. J. Cent. South Univ. 27, 711–720 (2020). https://doi.org/10.1007/s11771-020-4325-y

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  • DOI: https://doi.org/10.1007/s11771-020-4325-y

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