The role of glycine in the iron-phosphorous alloy electrodeposition

Natalia Kovalska (Corresponding author), Martin Pfaffeneder-Kmen, Natalia Tsyntsaru, Rudolf Mann, Henrikas Cesiulis, Wolfgang Hansal, Wolfgang Kautek (Corresponding author)

Publications: Contribution to journalArticlePeer Reviewed

Abstract

The influence of glycine on the iron phosphorous alloy electrodeposition was investigated by electrochemical quartz microbalance (EQMB), in-situ external reflection FTIR spectroscopy, and electrochemical impedance spectroscopy (EIS) measurements. An increase of glycine concentration leads to a decrease of the iron-phosphorous alloy electrodeposition rate and an increase of hydrogen evolution. Strong adsorption of glycine species, such as H-2(gly)(+), H(gly)(+/-) or/and Fe(gly)(+), have been observed during the hydrogen evolution and the Fe-P deposition reaction. Due to the concurrent hydrogen evolution the pH attains higher values at the interface than in the electrolyte bulk (pH2.5). The formation of adsorbed Fe(gly)(+) and of the chelate complex Fe(gly)(2) in solution avoids the precipitation of Fe(OH)(2) in the pH range between 2.5 and ca. 7 at the interface. The phosphorous content of the iron phosphorous alloy deposit increases with the glycine concentration. This is due to a lower deposition rate of iron caused by the adsorption of Fe(gly)(+), while the hypophosphite reduction rate to phosphorous increases. (C) 2019 Published by Elsevier Ltd.
Original languageEnglish
Pages (from-to)450-459
Number of pages10
JournalElectrochimica Acta
Volume309
DOIs
Publication statusPublished - 20 Jun 2019

Austrian Fields of Science 2012

  • 104005 Electrochemistry
  • 104017 Physical chemistry

Keywords

  • Electrodeposition
  • Iron-phosphorous alloys
  • Glycine
  • Adsorption
  • Complexation
  • FE-P
  • MAGNETIC-PROPERTIES
  • CORROSION BEHAVIOR
  • AMINO-ACIDS
  • ADSORPTION
  • COMPLEXES
  • GOLD

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