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Rare Metals

pp 1–8 | Cite as

Solder paste metamorphism

  • Fu-Wen ZhangEmail author
  • Hui-Jun He
  • Zhi-Gang Wang
  • Gang Lin
  • Jie Zhu
  • Jiang-Song Zhang
  • Shao-Ming Zhang
Article

Abstract

Solder paste quality can be improved from microstructure and surface status of the solder powder. In this work, the micro-morphology of solder paste was observed and the particle surface condition was analyzed. Also, the conditions of corrosion and the corrosion products in different organic acid groups (activators) were analyzed. The result shows that the SnO passive film on the solder powder surface reacts with the COO– in the active agent of the solder paste. This reaction led the passivation layer to be peeled off. It also caused the change in solder powders’ physical and chemical properties and made the metal boundary to be cold-welded. This is the root cause of solder paste exsiccation and deterioration. The study on the details shows that to obtain high-quality solder paste, one of the key methods is using the solder powder with ideal passivation shell structure and defect-free surface.

Keywords

Solder powder Micro-morphology Metamorphic solder paste Surface corrosion 

Notes

Acknowledgements

This work was financially supported by National Key R&D Program of China (No. 2017YFB0305700).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.General Research Institute for Nonferrous MetalsBeijingChina
  2. 2.Beijing COMPO Advanced Technology Co. LtdBeijingChina

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