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

Article

Abstract

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.

Keywords

corrosion electrodeposition galvanostatic deposition Zn-Co-Mo alloy 

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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

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