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Tartrate-Based Electrolyte for Electrodeposition of Fe–Sn Alloys

1
Hirtenberger Engineered Surfaces GmbH, Leobersdorfer Strasse 31-33, A-2552 Hirtenberg, Austria
2
Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
3
Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovak Republic
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(5), 313; https://doi.org/10.3390/coatings9050313
Received: 11 April 2019 / Revised: 3 May 2019 / Accepted: 7 May 2019 / Published: 10 May 2019
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Abstract

Magnetic properties of the sustainable Fe–Sn alloys are already known. However, there is lack of information in the field of Fe–Sn electrodeposition. In the present study, a novel Fe(III)–Sn(II) electrolyte with tartaric acid as a single complexing agent is introduced. The influence of the pH and the current density on the structural properties of the Fe–Sn deposit was studied. The stability of the electrolytes as a main attribute of sustainability was tested. The ferromagnetic phases Fe5Sn3 and Fe3Sn were electrodeposited for the first time, and it was found that the mechanism of the Fe–Sn deposition changes from normal to anomalous at a pH value 3.0 and a current density of approximately 30 mA/cm2. A possible reason for the anomalous deposition of Fe–Sn is the formation of Fe-hydroxides on the cathode surface. Two electrolyte stability windows exist: The first stability window is around a pH value of 1.8 where bimetallic Fe–Sn tartrate complexes were formed, and second one is around a pH value of 3.5 where most of the Sn ions were present in the form of [Sn(tart)2]2− and Fe in the form of [Fe(tart)]+ complexes. View Full-Text
Keywords: electrodeposition; iron-tin alloys; tartaric acid; anomalous deposition; intermetallic; electrolyte stability electrodeposition; iron-tin alloys; tartaric acid; anomalous deposition; intermetallic; electrolyte stability
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Mrkonjić Zajkoska, S.; Dobročka, E.; Hansal, S.; Mann, R.; Hansal, W.E.G.; Kautek, W. Tartrate-Based Electrolyte for Electrodeposition of Fe–Sn Alloys. Coatings 2019, 9, 313.

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