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Influence of the high temperature treatment of zinc phosphate conversion coatings on the corrosion protection of steel

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Abstract

An anhydrous α-Zn3(PO4)2 phase converted by the dehydration of hydrous zinc phosphate, Zn3(PO4)2·2H2O, crystal coatings in air at a temperature of approximately 300 °C, significantly enhances the corrosion resistance of steel, and also reduces the susceptibility of the crystals to alkaline dissolution. A subsequent α→γ phase transition at approximately 500 °C results in a poor protection behaviour, because of the formation of numerous microcracks on the crystal faces.

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Authors and Affiliations

  1. Process Sciences Division, Department of Applied Science, Brookhaven National Laboratory, 11973, Upton, New York, USA

    T. Sugama, L. E. Kukacka, N. Carciello & J. B. Warren

Authors
  1. T. Sugama
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  2. L. E. Kukacka
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  3. N. Carciello
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  4. J. B. Warren
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Sugama, T., Kukacka, L.E., Carciello, N. et al. Influence of the high temperature treatment of zinc phosphate conversion coatings on the corrosion protection of steel. J Mater Sci 26, 1045–1050 (1991). https://doi.org/10.1007/BF00576784

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  • DOI: https://doi.org/10.1007/BF00576784

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