Electrodeposition of manganese layers from sustainable sulfate based electrolytes
Fernández Barcia, Mónica (Institut für Festkörper- und Werkstofforschung Dresden)
Hoffmann, Volker (Leibniz Institute for Solid State and Materials Research Dresden)
Oswald, Steffen (Institut für Festkörper- und Werkstofforschung Dresden)
Giebeler, Lars (Institut für Festkörper- und Werkstofforschung Dresden)
Wolff, Ulrike (Institut für Festkörper- und Werkstofforschung Dresden)
Uhlemann, Margitta (Institut für Festkörper- und Werkstofforschung Dresden)
Gebert, Annett (Institut für Festkörper- und Werkstofforschung Dresden)

Data:	2018
Resum:	Functional manganese-(Mn)-containing layers are becoming increasingly important in the fields of sacrificial corrosion protection, biodegradable medical devices or electrochemical energy conversion systems. Electrodeposition can be a low cost and time-efficient production route, but the very electronegative nature of Mn makes this reduction process quite challenging. In this paper, electrolytic potentiostatic deposition of metallic Mn layers from environmentally friendly aqueous manganese sulfate electrolytes with pH 3 is successfully demonstrated. A continuous electrolyte flow in the cathodic compartment of the electrochemical cell for controlling the pH value during deposition was found to be essential for achieving good layer qualities. Based on cyclic voltammetry analysis in combination with quartz crystal microbalance measurements a suitable deposition potential range was identified. The obtained electrodeposited layers were characterized by means of SEM, XRD, GD-OES and XPS. The shift of the deposition potential from - 2. 4 VMSE to - 2. 6 VMSE (deposition time 60 min) yields a thickness increase of the metallic α-Mn deposits from < 500 nm to ~ 2 μm. Only thin additional surface regions of Mn-oxides/-hydroxides were identified. The important role of (NH4)2SO4 as complex-forming electrolyte additive is discussed and an impact of the salt concentration on the deposit properties is revealed. This is a promising starting point for further Mn alloy deposition analysis.
Ajuts:	European Commission 642642
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Mn electrodeposition ; PH control ; Sustainable electrolyte ; (NH4)2SO4 ; GD-OES ; XPS
Publicat a:	Surface and coatings technology, Vol. 334 (January 2018) , p. 261-268, ISSN 0257-8972

DOI: 10.1016/j.surfcoat.2017.11.028

Postprint 19 p, 1.0 MB

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