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Use of a rotating cylinder electrode in corrosion studies of a 90/10 Cu–Ni alloy in 0.5 mol L−1 H2SO4 media

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Abstract

The corrosion of 90/10 Cu–Ni alloy in deaerated 0.5 mol L−1 H2SO4 containing Fe(III) ions as oxidant and benzotriazole as inhibitor was studied using a rotating cylinder electrode (RCE). Nonselective dissolution was observed in all experimental conditions investigated. In the absence of Fe(III) ions, the anodic process is diffusion controlled while cathodic process is charge transfer controlled. In contrast, with Fe(III) ions as oxidant, the cathodic process is controlled by diffusion and the anodic process is under charge transfer control. These conclusions were obtained from measurements of open circuit potential as a function of the RCE rotation rate as previously verified for the RDE. Inhibition efficiency evaluated from weight loss and calculated from polarization curves showed good agreement.

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Author notes

  1. J.M. Maciel

    Present address: Presently at: UNIMAR, University of Marilia, Marilia – SP, Brazil, CEP 17515-460

Authors and Affiliations

  1. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, Caixa Paostal 26077, CEP 05508-990, São, Paulo – SP, Brazil

    J.M. Maciel

  2. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, Caixa Postal 26077, CEP 05508-990, São Paulo – SP, Brazil

    S.M.L. Agostinho

Authors
  1. J.M. Maciel
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  2. S.M.L. Agostinho
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Maciel, J., Agostinho, S. Use of a rotating cylinder electrode in corrosion studies of a 90/10 Cu–Ni alloy in 0.5 mol L−1 H2SO4 media. Journal of Applied Electrochemistry 30, 981–985 (2000). https://doi.org/10.1023/A:1004081212358

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