Electrodeposited Sn-Cu-Ni alloys as lead-free solders on copper substrate using deep eutectic solvents
The influence of electrodeposition mode on the morphology, composition and corrosion behaviour
Sabrina Patricia State (Politehnica University of Bucharest)
Stefania Costovici (Politehnica University of Bucharest)
M. Mousavi (TU Delft - Team Yaiza Gonzalez Garcia)
Yaiza Gonzalez Garcia (TU Delft - Team Yaiza Gonzalez Garcia)
Caterina Zanella (Jönköping University)
Anca Cojocaru (Politehnica University of Bucharest)
Liana Anicai (Politehnica University of Bucharest)
Teodor Visan (Politehnica University of Bucharest)
Marius Enachescu (Politehnica University of Bucharest)
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Abstract
In this work we present the pulsed current (PC) electrodeposition of Sn-Cu-Ni alloy as lead-free solder candidate, from choline chloride – ethylene glycol eutectic mixtures (1:2 molar ratio) onto copper metallic substrates. Electrolytes containing Sn2+, Cu2+ and Ni2+ salts in the selected deep eutectic solvent have been considered. The effect of the applied frequency of PC on the morphology, composition and melting point of the alloy is discussed and compared to the ones obtained using direct current (DC) plating mode. A refinement of the grain size and lower melting temperature of the alloy were noticed when pulsed current was applied. A comparative analysis of the electrochemical corrosion behaviour at macro- and micro- scale has been performed in 0.5 M and 0.1 M NaCl solutions involving potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode (SVET) techniques. Furthermore, an analysis after 96 h of exposure to salt mist test simulating a corrosive attack in harsh environment is presented, too. The obtained results showed enhanced corrosion resistance of the ternary alloys electrodeposited under PC conditions (the best for 1.67 Hz frequency) as compared to those using DC. Additionally, Raman spectroscopy evidenced the presence of tin oxi/hydroxy chloride and tin oxides as surface corrosion products. A corrosion mechanism has been proposed.