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The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte

Specifičnosti elektrohemijskog taloženja i morfologija Zn-Mn prevlaka dobijenih iz pirofosfatnog elektrolita

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2011
893.pdf (725.8Kb)
Authors
Bučko, Mihael
Stevanović, Sanja
Tomić, Milorad V.
Pavlović, Miomir G.
Bajat, Jelena
Article (Published version)
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Abstract
The first successful attempt to electrodeposit Zn-Mn alloy coatings from alkaline bath was made only a few years ago. In this kind of solution, potassium pyrophosphate (K4P2O7) serves both as a complexing agent and as the basic electrolyte. The aim of this work was to study the electrodeposition process and properties of Zn-Mn alloy coatings deposited from pyrophosphate solution, with a new kind of alkaline pyrophosphate bath. Namely, chloride salts were used as the source of metal ions and ascorbic acid was used as reducing agent. The composition of the plating solution was as follows: 1 mol dm-3 K4P2O7 + 0.017 mol dm-3 ascorbic acid + 0.05 mol dm-3 ZnCl2 + 0.05 mol dm-3 MnCl2·4H2O. Cathodic processes during the alloy electrodeposition were investigated using linear voltammetry. The influence of addition of small amounts of ascorbic acid on the cathodic processes was established. It was shown that this substance inhibits hydrogen evolution and increases the current efficiency of alloy... deposition. The current efficiency in the plating bath examined was in the range of 25 and 30%, which was quite higher as compared to the results reported in the literature for electrodeposition of Zn-Mn alloy from pyrophosphate bath. Electrodeposition of Zn-Mn alloys was performed galvanostatically on steel panels, at current densities of 20?120 mA cm-2. The coatings with the best appearance were obtained at current densities between 30 and 80 mA cm-2. The surface morphology studies, based on atomic force microscopy measurements, showed that morphology of the deposits is highly influenced by deposition current density. Zn-Mn coating deposited at 30 mA cm-2 was more compact and possessed more homogeneous structure (more uniform agglomeration size) than the coating deposited at 80 mA cm-2. Such dependence of morphology on the current density could be explained by the high rate of hydrogen evolution reaction during the electrodeposition process.

U proteklih nekoliko godina pokazano je da se alkalni pirofosfatni elektrolit može primeniti za elektrohemijsko taloženje prevlaka Zn-Mn legura na čeliku. U ovom radu je ispitana zavisnost morfologije i hemijskog sastava Zn-Mn prevlaka od primenjene gustine struje taloženja. Karakterizacija prevlaka vršena je mikroskopijom atomskih sila i energetskom disperzionom atomskom analizom. Metodom linearne voltametrije ispitan je uticaj dodatka, askorbinske kiseline, na katodne procese. Utvrđeno je da se iz alkalnog rastvora mogu dobiti prevlake zadovoljavajućeg kvaliteta, ali da gustina struje ima veliki uticaj na homogenost i hrapavost površine Zn-Mn prevlaka. Askorbinska kiselina inhibira redukciju vodonika i povećava iskorišćenje struje za taloženje legure.
Keywords:
Zn-Mn alloys / coatings / electrochemical deposition / surface characterization / atomic force microscopy / Zn-Mn legure / prevlake / elektrohemijsko taloženje / karakterizacija površine / mikroskopija atomskih sila
Source:
Hemijska industrija, 2011, 65, 3, 295-303
Publisher:
  • Association of Chemical Engineers of Serbia
Funding / projects:
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)

DOI: 10.2298/HEMIND101214003B

ISSN: 0367-598X

WoS: 000296999600011

Scopus: 2-s2.0-79960289247
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URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1777
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Bučko, Mihael
AU  - Stevanović, Sanja
AU  - Tomić, Milorad V.
AU  - Pavlović, Miomir G.
AU  - Bajat, Jelena
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1777
AB  - The first successful attempt to electrodeposit Zn-Mn alloy coatings from alkaline bath was made only a few years ago. In this kind of solution, potassium pyrophosphate (K4P2O7) serves both as a complexing agent and as the basic electrolyte. The aim of this work was to study the electrodeposition process and properties of Zn-Mn alloy coatings deposited from pyrophosphate solution, with a new kind of alkaline pyrophosphate bath. Namely, chloride salts were used as the source of metal ions and ascorbic acid was used as reducing agent. The composition of the plating solution was as follows: 1 mol dm-3 K4P2O7 + 0.017 mol dm-3 ascorbic acid + 0.05 mol dm-3 ZnCl2 + 0.05 mol dm-3 MnCl2·4H2O. Cathodic processes during the alloy electrodeposition were investigated using linear voltammetry. The influence of addition of small amounts of ascorbic acid on the cathodic processes was established. It was shown that this substance inhibits hydrogen evolution and increases the current efficiency of alloy deposition. The current efficiency in the plating bath examined was in the range of 25 and 30%, which was quite higher as compared to the results reported in the literature for electrodeposition of Zn-Mn alloy from pyrophosphate bath. Electrodeposition of Zn-Mn alloys was performed galvanostatically on steel panels, at current densities of 20?120 mA cm-2. The coatings with the best appearance were obtained at current densities between 30 and 80 mA cm-2. The surface morphology studies, based on atomic force microscopy measurements, showed that morphology of the deposits is highly influenced by deposition current density. Zn-Mn coating deposited at 30 mA cm-2 was more compact and possessed more homogeneous structure (more uniform agglomeration size) than the coating deposited at 80 mA cm-2. Such dependence of morphology on the current density could be explained by the high rate of hydrogen evolution reaction during the electrodeposition process.
AB  - U proteklih nekoliko godina pokazano je da se alkalni pirofosfatni elektrolit može primeniti za elektrohemijsko taloženje prevlaka Zn-Mn legura na čeliku. U ovom radu je ispitana zavisnost morfologije i hemijskog sastava Zn-Mn prevlaka od primenjene gustine struje taloženja. Karakterizacija prevlaka vršena je mikroskopijom atomskih sila i energetskom disperzionom atomskom analizom. Metodom linearne voltametrije ispitan je uticaj dodatka, askorbinske kiseline, na katodne procese. Utvrđeno je da se iz alkalnog rastvora mogu dobiti prevlake zadovoljavajućeg kvaliteta, ali da gustina struje ima veliki uticaj na homogenost i hrapavost površine Zn-Mn prevlaka. Askorbinska kiselina inhibira redukciju vodonika i povećava iskorišćenje struje za taloženje legure.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte
T1  - Specifičnosti elektrohemijskog taloženja i morfologija Zn-Mn prevlaka dobijenih iz pirofosfatnog elektrolita
EP  - 303
IS  - 3
SP  - 295
VL  - 65
DO  - 10.2298/HEMIND101214003B
ER  - 
@article{
author = "Bučko, Mihael and Stevanović, Sanja and Tomić, Milorad V. and Pavlović, Miomir G. and Bajat, Jelena",
year = "2011",
abstract = "The first successful attempt to electrodeposit Zn-Mn alloy coatings from alkaline bath was made only a few years ago. In this kind of solution, potassium pyrophosphate (K4P2O7) serves both as a complexing agent and as the basic electrolyte. The aim of this work was to study the electrodeposition process and properties of Zn-Mn alloy coatings deposited from pyrophosphate solution, with a new kind of alkaline pyrophosphate bath. Namely, chloride salts were used as the source of metal ions and ascorbic acid was used as reducing agent. The composition of the plating solution was as follows: 1 mol dm-3 K4P2O7 + 0.017 mol dm-3 ascorbic acid + 0.05 mol dm-3 ZnCl2 + 0.05 mol dm-3 MnCl2·4H2O. Cathodic processes during the alloy electrodeposition were investigated using linear voltammetry. The influence of addition of small amounts of ascorbic acid on the cathodic processes was established. It was shown that this substance inhibits hydrogen evolution and increases the current efficiency of alloy deposition. The current efficiency in the plating bath examined was in the range of 25 and 30%, which was quite higher as compared to the results reported in the literature for electrodeposition of Zn-Mn alloy from pyrophosphate bath. Electrodeposition of Zn-Mn alloys was performed galvanostatically on steel panels, at current densities of 20?120 mA cm-2. The coatings with the best appearance were obtained at current densities between 30 and 80 mA cm-2. The surface morphology studies, based on atomic force microscopy measurements, showed that morphology of the deposits is highly influenced by deposition current density. Zn-Mn coating deposited at 30 mA cm-2 was more compact and possessed more homogeneous structure (more uniform agglomeration size) than the coating deposited at 80 mA cm-2. Such dependence of morphology on the current density could be explained by the high rate of hydrogen evolution reaction during the electrodeposition process., U proteklih nekoliko godina pokazano je da se alkalni pirofosfatni elektrolit može primeniti za elektrohemijsko taloženje prevlaka Zn-Mn legura na čeliku. U ovom radu je ispitana zavisnost morfologije i hemijskog sastava Zn-Mn prevlaka od primenjene gustine struje taloženja. Karakterizacija prevlaka vršena je mikroskopijom atomskih sila i energetskom disperzionom atomskom analizom. Metodom linearne voltametrije ispitan je uticaj dodatka, askorbinske kiseline, na katodne procese. Utvrđeno je da se iz alkalnog rastvora mogu dobiti prevlake zadovoljavajućeg kvaliteta, ali da gustina struje ima veliki uticaj na homogenost i hrapavost površine Zn-Mn prevlaka. Askorbinska kiselina inhibira redukciju vodonika i povećava iskorišćenje struje za taloženje legure.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte, Specifičnosti elektrohemijskog taloženja i morfologija Zn-Mn prevlaka dobijenih iz pirofosfatnog elektrolita",
pages = "303-295",
number = "3",
volume = "65",
doi = "10.2298/HEMIND101214003B"
}
Bučko, M., Stevanović, S., Tomić, M. V., Pavlović, M. G.,& Bajat, J.. (2011). The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte. in Hemijska industrija
Association of Chemical Engineers of Serbia., 65(3), 295-303.
https://doi.org/10.2298/HEMIND101214003B
Bučko M, Stevanović S, Tomić MV, Pavlović MG, Bajat J. The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte. in Hemijska industrija. 2011;65(3):295-303.
doi:10.2298/HEMIND101214003B .
Bučko, Mihael, Stevanović, Sanja, Tomić, Milorad V., Pavlović, Miomir G., Bajat, Jelena, "The peculiarities of electrochemical deposition and morphology of Zn-Mn alloy coatings obtained from pyrophosphate electrolyte" in Hemijska industrija, 65, no. 3 (2011):295-303,
https://doi.org/10.2298/HEMIND101214003B . .

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