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Int. J. Electroactive Mater. 2 (2014) 8-16

Corrosion of Sn-9Zn Solder Joints: A Review

Muhammad Ghaddafy Affendy 1, Muhamad Zamri Yahaya1, Ahmad Azmin Mohamad2*

1School of Materials and Mineral Resources Engineering, USM, Nibong Tebal, Penang, Malaysia
2School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia

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Abstract : Soldering in the electrical and electronics industries has been elevated to a different level that involves significant changes resulting from the introduction of lead-free solders, particularly the Sn-9Zn solder system. A Sn-9Zn solder has high potential in solder joint applications because of its similarity in melting temperature with lead-based solders and excellent mechanical properties. However, threats from atmospheric corrosion are among the issues on the reliability of Sn-9Zn solder joints. Corrosion reduces solder joint strength because of the formation of pits and corrosion products. Pits coalesce and form cracks, which function as fracture paths upon joint failure. Corrosion products are formed through chemical reactions between ions released from the Sn-9Zn solder and the corrosive medium, that is, seawater or alkaline solution.

Keywords : Corrosion,Solder,Sn-9Zn,Shear strength,Lap joints,