Effect of Bismuth and Silver on the Corrosion Behavior of Lead-free Solders in 3.5 wt% NaCl Solution

  • Patrik Tamási Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Techology and Economics
  • György Kósa Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Techology and Economics
  • Bence Szabó Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Techology and Economics
  • Richárd Berényi Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Techology and Economics
  • Bálint Medgyes Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Techology and Economics

Abstract

Electroanalytical tests were carried out to investigate the corrosion behavior of various lead-free solder alloys in 3.5 wt% NaCl bulk solution under room temperature. Scanning electron microscope (SEM) method was applied to investigate the corroded surface structure and corrosion depth using cross-sectional samples. Furthermore, energy dispersive spectroscopy (EDS) method was also applied to identify the chemical elemental composition of the corrosion products of the solders. The results showed that the bismuth and silver bearing solders have lower corrosion resistance compared to other lead-free solders and to the widely used SAC305 as well. The different corrosion resistance was explained by the different silver and bismuth content and volume of the corrosion products, which can lead back to the differences of the original alloying components. This study is highlighted that the bismuth and silver content may pose a relative high corrosion risk related to lead-free solder alloys used in electronics.
Keywords: electrochemical corrosion, micro-alloyed solder alloy, NaCl solution, potentiodynamic polarization test
Published online
2016-08-31
How to Cite
Tamási, P., Kósa, G., Szabó, B., Berényi, R. and Medgyes, B. (2016) “Effect of Bismuth and Silver on the Corrosion Behavior of Lead-free Solders in 3.5 wt% NaCl Solution”, Periodica Polytechnica Electrical Engineering and Computer Science, 60(4), pp. 232-236. https://doi.org/10.3311/PPee.9706.
Section
VINMES Special Issue - Novel Trends in Electronics Technology