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Anodic pickling of stainless steels in sulphuric acid

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Abstract

Potentiostatic pickling in 20% aqueous H2SO4 was investigated on hot- and cold-rolled strips of stainless steels from industrial lines, in order to assess the potentiality of this technique. Experimental evidences for AISI Types 202, 304, 316, 410 and 430 are given. Optimum pickling conditions were defined on the basis of the potentiodynamic behaviour of oxidized specimens.

Visual and electrochemical evaluation of pickled surfaces showed that:

  1. (i)

    The potentiostatic technique makes descaling and pickling of stainless steels quite feasible in sulphuric baths;

  2. (ii)

    remarkable advantages result over ordinary chemical treatments in terms of speed of scale removal;

  3. (iii)

    a higher efficiency of restoration of passivity properties also results.

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Authors and Affiliations

  1. Centro Sperimentale Metallurgico, S.p.a., Via di Castel Romano, Roma, Italy

    A. Tamba & N. Azzerri

Authors
  1. A. Tamba
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  2. N. Azzerri
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Tamba, A., Azzerri, N. Anodic pickling of stainless steels in sulphuric acid. J Appl Electrochem 2, 175–181 (1972). https://doi.org/10.1007/BF02354974

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  • DOI: https://doi.org/10.1007/BF02354974

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