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Corrosion behaviour of Ti-6Al-4V in phosphoric acid

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Abstract

Ti-6A1-4V shows distinct active-passive behaviour in phosphoric acid over a wide concentration range. The cathodic polarization curves are similar over a wide range of acid concentration and temperatures. The alloy undergoes active dissolution and turns passive in the negative potential region followed by a wide range of passivity at all acid concentrations at different temperatures. Increasing acid concentration up to 11 M results in an increase in critical current density (i cr). The passive current density (i p) increases up to an acid concentration of 9 M while at 13 M i cr and i p decrease appreciably. A significant increase in both i cr and i p occurs with increase in solution temperature. The passive specimen remained stable for a long time when exposed to phosphoric acid under open circuit conditions.

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Authors and Affiliations

  1. Department of Chemistry, Banaras Hindu University, 221 005, Varanasi, India

    V. B. Singh & S. M. A. Hosseini

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  1. V. B. Singh
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  2. S. M. A. Hosseini
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Singh, V.B., Hosseini, S.M.A. Corrosion behaviour of Ti-6Al-4V in phosphoric acid. J Appl Electrochem 24, 250–255 (1994). https://doi.org/10.1007/BF00242892

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  • DOI: https://doi.org/10.1007/BF00242892

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