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A radioanalytical study of the chromate conversion coating formed on aluminium

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Abstract

Phosphate/chromate and accelerated chromate coatings were produced on commercially available aluminium. The Cr, P and Fe components of the conversion coatings were determined by radioactive tracer technique. The tracer technique was combined with ion-exchange and film-sectioning methods to determine the chromium (III)/total chromium ratio in the accelerated chromate coating. It was found that during the acidic dissolution of the conversion coating the chromium (III)/total chromium ratio may suffer changes. The filmforming components in the metal/bath interface are supersaturated and deposited onto the aluminium. The identified components of the accelerated chromate coatings are Cr/OH/3, Cr/OH/CrO4 and Cr4[Fe/CN/6]3 and the chromium (III)/total chromium ratio was found to be cca. 2/3.

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Authors and Affiliations

  1. Institute of Radiochemistry and Physics, Veszprém University of Chemical Engineering, 8200, Veszprém, Hungary

    T. Drozda & E. Maleczki

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  1. T. Drozda
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  2. E. Maleczki
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Drozda, T., Maleczki, E. A radioanalytical study of the chromate conversion coating formed on aluminium. Journal of Radioanalytical and Nuclear Chemistry Letters 95, 339–349 (1985). https://doi.org/10.1007/BF02166272

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  • DOI: https://doi.org/10.1007/BF02166272

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