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 language | English |
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Pages (from-to) | 450-459 |
Number of pages | 10 |
Journal | Electrochimica Acta |
Volume | 309 |
DOIs | |
Publication status | Published - 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