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The nature of the passive film on cathodically modified stainless steels

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Abstract

This paper discusses the effect of additions of platinum group metals (PGMs) on the composition of the passive surface layer formed on stainless steels in reducing acid media. It has been shown that there is an accumulation of these noble metals on the surface of the alloy during the period of active dissolution. The morphology and factors influencing this accumulation of PGMs on the surface are discussed. It was also found that there are differences between passive films formed spontaneously and those formed under potentiostatic control. An interesting fact emerging from the investigations is that different PGMs form different types of oxides on the passivated surfaces. Areas for possible future research are mentioned.

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Authors and Affiliations

  1. Physical Metallurgy Division, Mintek, Private Bag X3015, 2125, Randburg, Republic of South Africa

    J. H. Potgieter

  2. Department of Chemical Engineering, University of Pretoria, 0001, Pretoria, Republic of South Africa

    W. Skinner

  3. Department of Chemistry, University of Pretoria, 0001, Pretoria, Republic of South Africa

    A. M. Heyns

Authors
  1. J. H. Potgieter
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  2. W. Skinner
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  3. A. M. Heyns
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Potgieter, J.H., Skinner, W. & Heyns, A.M. The nature of the passive film on cathodically modified stainless steels. J Appl Electrochem 23, 11–18 (1993). https://doi.org/10.1007/BF00241569

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  • DOI: https://doi.org/10.1007/BF00241569

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