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Electrodeposition of tin-bismuth alloys: Additives, morphologies and compositions

Publication Type : Journal Article

Thematic Areas : Advanced Materials and Green Technologies

Publisher : Journal of the Electrochemical Society

Source : Journal of the Electrochemical Society, Electrochemical Society Inc., Volume 165, Number 2, p.D50-D57 (2018)

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Keywords : Alloy compositions, Atomic emission spectroscopy, Binary alloys, Bismuth alloys, Bismuth compounds, Chronoamperometry, Crystallinities, Electrodeposition, Electrodes, Inductively coupled plasma, Inductively coupled plasma atomic emission spectroscopy, Ions, Linear sweep voltammetry, Morphology, Novel morphologies, Polycrystalline copper, Polycrystalline materials, Polyvinyl alcohols, scanning electron microscopy, Tin alloys, Tin Compounds, Transfer reaction, Two-step reduction

Campus : Coimbatore

School : School of Engineering

Center : Center for Excellence in Advanced Materials and Green Technologies

Department : Chemical, Civil

Year : 2018

Abstract : Electrodeposition of tin-bismuth alloys on polycrystalline copper electrodes has been studied from an acidic bath comprising SnCl4, Bi(NO3)3, citric acid, poly(vinyl alcohol) and betaine. Using linear sweep voltammetry (LSV) and chronoamperometry (CA), co-deposition of tin and bismuth from the above bath has been examined. Bismuth (III) ions get reduced in a single-step, threeelectron- transfer reaction while tin (IV) ions undergo a two-step reduction through the formation of tin (II) ions. Nitric acid in the bath not only enhances solubility of the precursors but also decreases the peak potential separation between bismuth (III) and tin (II) ions. Through the introduction of various additives and variation in bath pH, co-deposition is preserved while the composition of tin in the obtained alloy is modified. The morphologies, composition and crystallinity of the deposits have been determined using scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy and X-ray diffraction, respectively. A wide range of alloy compositions (from 14% to 75% tin), including the eutectic Sn-Bi alloy have been deposited. Novel morphologies such as yarns-of-spool have been obtained. © 2018 The Electrochemical Society.

Cite this Research Publication : A. R. Rajamani, Jothi, S., Datta, M., and Dr. Murali Rangarajan, “Electrodeposition of tin-bismuth alloys: Additives, morphologies and compositions”, Journal of the Electrochemical Society, vol. 165, pp. D50-D57, 2018.

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