Electrochemical processing of tin-containing solders with the use of electrolyte based on potassium hydroxide

M.S. Akbarov; O.V. Chernyshova; G.A. Ussoltseva; А. Akchil

doi:10.31643/2019/6445.08

Authors

M.S. Akbarov Satbayev University
O.V. Chernyshova Russian Technological University
G.A. Ussoltseva Satbayev University
А. Akchil University of Suleyman Demirel

DOI:

https://doi.org/10.31643/2019/6445.08

Keywords:

lead-tin solders, alkaline electrolyte, anodic dissolution, electrochemical polarization.

Abstract

This article is dedicated to the processing of the secondary tin-containing alloys by the electrochemical method. The provided article reviews exploratory studies regarding the anodic dissolution of the lead-tin solders, conducted by the EСС-1012 electrochemical complex in galvanostatic mode with using as an electrolyte solution of potassium hydroxide. The anodic dissolution was demonstrated to go differently depending on the concentration of alkaline electrolyte. For instance, at 50 g/dm³ concentration of potassium hydroxide, the dissolution commence was recorded at a 0.4 V capacity and the reaction goes predominantly with the HSnO₂– formation, also in this case the lead dissolution is unlikely. After that, the anode passivation takes place owing to the formation of oxidation films of the metals and oxygen release. The alkali concentration increases within the electrolyte to 100 g/dm³ leads to a dramatic change in the current potential curves, corresponding to the formation of HSnO₂-, HPbO₂-, Sn₂+ and Pb₂+. In addition, an increase of alkali concentration in the solution will contribute to a more active dissolution of the metals, even at the initial stage. As the anode surface develops, it beneficiates alternately with either lead or tin. The formation of tetravalent lead and tin ions upon anodic dissolution of lead-tin alloys in the alkali solutions is unlikely. Within the process of anodic dissolution, an electrolytic sludge was obtained, which contained not only a tin but also the copper, lead, antimony, aluminum and iron have been found.

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Author Biographies

M.S. Akbarov, Satbayev University

Аssistant, Satbayev University, (“Kazakh National Research Technical University named after K.I. Satpaev”, the department”) Metallurgical processes, heat engineering and technology of special materials”, Almaty, Kazakhstan.

O.V. Chernyshova, Russian Technological University

Candidate of Technical Sciences, docent, Russian Technological University, Moscow, Russia.

G.A. Ussoltseva, Satbayev University

Candidate of Technical Sciences, Assistant Professor, Satbayev University, (“Kazakh National Research Technical University named after K.I. Satpaev”, the department”) Metallurgical processes, heat engineering and technology of special materials”, Almaty, Kazakhstan.

А. Akchil, University of Suleyman Demirel

Professor, University of Suleyman Demirel, Isparta, Turkey.

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