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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bucko, Mihael
University of Defence
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2020Zn-Mn alloy coatings electrodeposited from acidic sulfate-citrate bathcitations
- 2017The influence of water on the cathodic voltammetric responses of choline chloride-urea and choline chloride-ethylene glycol deep eutectic solvents
- 2011The peculiarities of electrochemical deposition and morphology of ZnMn alloy coatings obtained from pyrophosphate electrolytecitations
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article
The peculiarities of electrochemical deposition and morphology of ZnMn alloy coatings obtained from pyrophosphate electrolyte
Abstract
<jats:p>The first successful attempt to electrodeposit ZnMn alloy coatings fromalkaline bath was made only a few years ago. In this kind of solution,potassium pyrophosphate (K4P2O7) serves both as a complexing agent and as thebasic electrolyte. The aim of this work was to study the electrodepositionprocess and properties of ZnMn alloy coatings deposited from pyrophosphatesolution, with a new kind of alkaline pyrophosphate bath. Namely, chloridesalts were used as the source of metal ions and ascorbic acid was used asreducing agent. The composition of the plating solution was as follows: 1 moldm-3 K4P2O7 + 0.017 mol dm-3 ascorbic acid + 0.05 mol dm-3 ZnCl2 + 0.05 moldm-3 MnCl2?4H2O. Cathodic processes during the alloy electrodeposition wereinvestigated using linear voltammetry. The influence of addition of smallamounts of ascorbic acid on the cathodic processes was established. It wasshown that this substance inhibits hydrogen evolution and increases thecurrent efficiency of alloy deposition. The current efficiency in the platingbath examined was in the range of 25 and 30%, which was quite higher ascompared to the results reported in the literature for electrodeposition ofZnMn alloy from pyrophosphate bath. Electrodeposition of ZnMn alloys wasperformed galvanostatically on steel panels, at current densities of 20120 mAcm-2. The coatings with the best appearance were obtained at currentdensities between 30 and 80 mA cm-2. The surface morphology studies, based onatomic force microscopy measurements, showed that morphology of the depositsis highly influenced by deposition current density. ZnMn coating deposited at30 mA cm-2 was more compact and possessed more homogeneous structure (moreuniform agglomeration size) than the coating deposited at 80 mA cm-2. Suchdependence of morphology on the current density could be explained by thehigh rate of hydrogen evolution reaction during the electrodepositionprocess.</jats:p>