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Corrosion behavior of composition modulated multilayer Zn–Co electrodeposits produced using a single-bath technique

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Abstract

Composition modulated alloy (CMA) electrodeposits of Zn–Co were produced from acid chloride baths by the single-bath technique. Their corrosion behavior was evaluated as a function of the switched cathode current densities and the number of layers. The process was optimized with respect to the highest corrosion resistance. Enhanced corrosion resistance was obtained when the outer layer was slightly richer with cobalt. At the optimum switched current densities 40/55 mA cm−2, a coating with 600 layers showed ~6 times higher corrosion resistance than monolithic Zn–Co electrodeposit having the same thickness. The CMA coating exhibited red rust only after 1,130 h in a salt-spray test. The increased corrosion resistance of the multilayer alloys was related to their inherent barrier properties, as revealed by Electrochemical Impedance Spectroscopy. The corrosion resistance was explained in terms of n-type semiconductor films at the interface as supported by Mott–Schottky plots.

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Acknowledgment

Thangaraj V. is grateful to NITK, Surathkal, for providing the Institute Fellowship that allowed carrying out this work.

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Authors and Affiliations

  1. Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, 575 025, India

    V. Thangaraj & A. Chitharanjan Hegde

  2. Biomaterials and Corrosion Laboratory, Tel-Aviv University, Ramat-Aviv, 69978, Israel

    N. Eliaz

Authors
  1. V. Thangaraj
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  2. N. Eliaz
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  3. A. Chitharanjan Hegde
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Correspondence to A. Chitharanjan Hegde.

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Thangaraj, V., Eliaz, N. & Hegde, A.C. Corrosion behavior of composition modulated multilayer Zn–Co electrodeposits produced using a single-bath technique. J Appl Electrochem 39, 339–345 (2009). https://doi.org/10.1007/s10800-008-9677-1

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  • DOI: https://doi.org/10.1007/s10800-008-9677-1

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