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Studies on electrodeposition and corrosion behaviour of a Ni–W–Co amorphous alloy

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Abstract

A ternary alloy Ni–W–Co was electrodeposited and operational parameters in relation to its corrosion resistance and deposition efficiency were optimized. A 22 full factorial design was successfully employed for experimental design analysis of the results. By means of response surface analysis, the statistical model identified the following operating conditions for obtaining corrosion resistant alloy: 60 mA/cm2 current density, 70 °C temperature, 20 rpm cathode rotation and 8.0 pH. The alloy was deposited at 36% current efficiency, with an average composition of 70% Ni, 8% Co, 22% W and traces of boron and with E corr −0.508 V and R p 4.56 × 104 Ohm. The deposit obtained under these conditions had an amorphous character and showed good adherence, high corrosion resistance and presence of nodules on its surface. Electrochemical corrosion tests verified that the Ni–W–Co alloy had better corrosion resistance than similarly electrodeposited Co–W amorphous alloy.

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Acknowledgement

The authors are grateful to CNPq, CAPES and FINEP for financial assistance.

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Authors and Affiliations

  1. Department of Chemical Engineering, Universidade Federal de Campina Grande, Post Box 10108, Campina Grande, Paraiba, 58109-970, Brazil

    Renato Alexandre C. Santana, Ana Regina N. Campos, Emanuelle A. Medeiros, Aldrighi Luiz M. Oliveira, Liana Maria F. Silva & Shiva Prasad

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  1. Renato Alexandre C. Santana
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  2. Ana Regina N. Campos
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  3. Emanuelle A. Medeiros
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  4. Aldrighi Luiz M. Oliveira
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  5. Liana Maria F. Silva
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  6. Shiva Prasad
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Corresponding author

Correspondence to Shiva Prasad.

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Santana, R.A.C., Campos, A.R.N., Medeiros, E.A. et al. Studies on electrodeposition and corrosion behaviour of a Ni–W–Co amorphous alloy. J Mater Sci 42, 9137–9144 (2007). https://doi.org/10.1007/s10853-007-1931-0

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  • DOI: https://doi.org/10.1007/s10853-007-1931-0

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