Journal of Materials Engineering and Performance

, Volume 26, Issue 4, pp 1958–1966 | Cite as

Electrodeposition of Zn-Co-Mo Alloy on the Steel Substrate from Citrate Bath and Its Corrosion Behavior in the Chloride Media



In this study, Zn-Co-Mo coatings were deposited on the steel substrate from a citrate bath after adjusting pH, concentration, and current density. The morphology, the content of alloying elements, and the thickness of deposits were studied. Deposition behavior of these ternary coatings was examined by cathodic polarization and cyclic voltammetry (CV) techniques. The synthesized deposits were investigated by scanning electron microscopy (SEM), energy-dispersive x-ray (EDX) analysis, x-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization methods. The results showed that the deposition potential of Zn-Co-Mo alloy was feasible in negative potentials higher than about −1.25 V versus Ag/AgCl. Moreover, the corrosion behavior of these coatings was found to be related to the extent of Mo as well as the local anodes and cathodes. The amount of molybdenum in the Zn-Co-Mo coating varied from 2.6 to 14 wt.% as a result of changing the pH. Based on the experimental findings, a narrow range of pH values between 5 and 5.5 could contribute to the high quality of coating in conjunction with the corrosion resistant alloy. Besides, the coatings with Mo element could show a passive-like behavior in the anodic region.


corrosion electrodeposition galvanostatic deposition Zn-Co-Mo alloy 


  1. 1.
    J.B. Bajat, S. Stanković, and B.M. Jokić, Electrochemical Deposition and Corrosion Stability of Zn-Co Alloys, J. Solid State Electrochem., 2009, 13, p 755–762CrossRefGoogle Scholar
  2. 2.
    R. Lopez Anton, M.L. Fdez Gubieda, A. Garcia-Arribas, J. Herreros, and M. Insausti, Preparation and Characterisation of Cu-Co Heterogeneous Alloys by Potentiostatic Electrodeposition, Mater. Sci. Eng. A, 2002, 335, p 94–100CrossRefGoogle Scholar
  3. 3.
    J.L.O. Aparicio, Y. Measa, G. Trejoa, R. Ortega, T.W. Chapman, E. Chainet, and P. Ozilb, ZnCo-Electrodeposition Baths Based on Alkaline Chloride-Gluconate Electrolytes Containing Quaternary Ammonium Compounds, J. Electrochem. Soc., 2009, 156, p 205–213CrossRefGoogle Scholar
  4. 4.
    H. Kazimierczak and P. Ozga, Electrodeposition of Sn-Zn and Sn-Zn-Mo Layers from Citrate Solutions, Surf. Sci., 2013, 607, p 33–38CrossRefGoogle Scholar
  5. 5.
    N. Boshkov, N. Boshkova, V. Bachvarov, M. Peshova, and L. Lutov, Corrosion Investigations of Black Chromite Films on Zn and Zn-Co Coatings with Low Cobalt Content, J. Mater. Eng. Perform., 2015, 24, p 4736–4745CrossRefGoogle Scholar
  6. 6.
    Z.F. Lodhi, J.M.C. Mol, A. Hovestad, L. Hoen-Velterop, H. Terryn, and J.H.W. de Wit, Corrosion Resistance of Zn–Co–Fe Alloy Coatings on High Strength Steel, Surf. Coat. Technol., 2009, 203, p 1415–1422CrossRefGoogle Scholar
  7. 7.
    J. Winiarski, W. Tylus, K. Winiarska, and B. Szczygieł, The Influence of Molybdenum on the Corrosion Resistance of Ternary Zn-Co-Mo Alloy Coatings Deposited from Citrate–Sulphate Bath, Corros. Sci., 2015, 91, p 330–340CrossRefGoogle Scholar
  8. 8.
    B. Szczygieł, A. Laszczyńsk, and W. Tylus, Influence of Molybdenum on Properties of Zn-Ni and Zn-Co Alloy Coatings, Surf. Coat. Technol., 2010, 204, p 1438–1444CrossRefGoogle Scholar
  9. 9.
    J. Winiarski, W. Tylus, and B. Szczygieł, EIS and XPS Investigations on the Corrosion Mechanism of Ternary Zn-Co-Mo Alloy Coatings in NaCl Solution, Appl. Surf. Sci., 2016, 364, p 455–466CrossRefGoogle Scholar
  10. 10.
    A. Brenner, Electrodeposition of Alloys, Vols. 1 and 2, Academic Press, New York, 1963Google Scholar
  11. 11.
    K. Higashi, H. Fukushima, T. Urakawa, T. Adaniya, and K. Matsudo, Mechanism of the Electrodeposition of Zinc Alloys Containing a Small Amount of Cobalt, J. Electrochem. Soc., 1981, 128, p 2081–2085CrossRefGoogle Scholar
  12. 12.
    R. Fratesi and G. Roventi, Electrodeposition of Zinc-Nickel Alloy Coatings from a Chloride Bath Containing NH4Cl, J. Appl. Electrochem., 1992, 22, p 657–662CrossRefGoogle Scholar
  13. 13.
    H. Kazimierczak, P. Ozga, and R.P. Socha, Investigation of Electrochemical Co-deposition of Zinc and Molybdenum from Citrate Solutions, Electrochim. Acta, 2013, 104, p 378–390CrossRefGoogle Scholar
  14. 14.
    P. Amico, P.G. Daniele, G. Ostacoli, G. Arena, E. Rizzarelli, and S. Sammartano, Mixed Metal Complexes in Solution. Part 4. Formation and Stability of Heterobinuclear Complexes of Cadmium(II)-Citrate with Some Bivalent Metal Ions in Aqueous Solution, Trans. Met. Chem., 1985, 10, p 11–14CrossRefGoogle Scholar
  15. 15.
    M. Saremi and M. Yeganeh, Application of Mesoporous Silica Nanocontainers as Smart Host of Corrosion Inhibitor in Polypyrrole Coatings, Corros. Sci., 2014, 86, p 159–170CrossRefGoogle Scholar
  16. 16.
    K. Kanda and K. Saijo, Chemical State Analysis of Zn-Co-Mo Electroplated Layers by x-ray Photoelectron Spectroscopy, J. Met. Finish. Soc. Jpn., 1984, 35, p 230–235CrossRefGoogle Scholar

Copyright information

© ASM International 2017

Authors and Affiliations

  1. 1.Department of Metallurgy and Materials Engineering, Faculty of Technology and EngineeringShahrekord UniversityShahrekordIran
  2. 2.Department of Materials Science and Engineering, Faculty of EngineeringShahid Chamran University of AhvazAhvazIran
  3. 3.Corrosion Laboratory, School of Metallurgy and Materials Engineering, University College of EngineeringUniversity of TehranTehranIran

Personalised recommendations