Journal of Materials Science

, Volume 26, Issue 4, pp 1045–1050 | Cite as

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

  • T. Sugama
  • L. E. Kukacka
  • N. Carciello
  • J. B. Warren


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.


Zinc 2H2O Phase Transition Dehydration Corrosion Resistance 
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Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • T. Sugama
    • 1
  • L. E. Kukacka
    • 1
  • N. Carciello
    • 1
  • J. B. Warren
    • 1
  1. 1.Process Sciences Division, Department of Applied ScienceBrookhaven National LaboratoryUptonUSA

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