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Int. J. Electroactive Mater. 2 (2014) 34-39

Polarization Study of Sn-9Zn Lead-free Solder in KOH Solutions

Muhammad Firdaus Mohd Nazeri1, Ahmad Azmin Mohamad2

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

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Abstract : The corrosion behavior of Sn-9Zn solder was compared by means of potentiodynamic polarization in different concentrations of potassium hydroxide (KOH). The preferential dissolution of Zn from Sn-9Zn solder dictates the initial corrosion process in all concentrations of KOH solution tested. The effect of KOH concentrations on the corrosion potential was shown to be relatively insignificant. In contrast, increasing the concentrations from 6 to 9 M increased the current density by over 200 % compared to 0 M. Post-corrosion analyses show that the light and dark- contrast corrosion products dominate the surface of the solder after polarization that removes the characteristic anomalous eutectic structure of Sn-9Zn. Morphological examination revealed that the corrosion products were poorly distributed after polarization. This result demonstrates that protection offered by the presence of corrosion product from further corrosion attack is insignificant.

Keywords : Corrosion ,Pb-free solders,Sn-9Zn,Potentiodynamic polarization,Potassium hydroxide,