Journal of Materials Science

, Volume 24, Issue 12, pp 4419–4422 | Cite as

State analysis related to zinc and manganese components in hopeite crystals of zinc phosphate films by XANES and EXAFS

  • N. Sato
  • T. Minami
Papers

Abstract

Using Hopeite crystals as zinc phosphate films formed on zinc coated steel sheets of automobile body, EXAFS methods were applied to analyze the local structure of heavy metal components contained in these crystals. The relationship between these spectral data and the modified crystal structure of Hopeite was discussed. Analysis was done by observing XANES spectra and Fourier transformation of EXAFS for two kinds of powdered Hopeite crystals formed in zinc phosphating bath. XANES and EXAFS spectra for Zn-K and Mn-K absorption edge of the Hopeite containing a manganese component were compared with those of the manganese free sample. Both spectra showed almost the same value of the absorption edge with 9.662–9.663 keV, but the amplitude of XANES and EXAFS spectra for the former was smaller than that for the latter. And, though Mn-K absorption edges were 6.545–6.546 keV for the modified Hopeite crystals and MnO, that of MnO2 showed a higher value by 5–6eV than the former samples. The peak position of EXAFS relating to first neighbouring atom showed the same difference as in XANES. These facts support that manganese exists as Mn2+ in the modified Hopeite crystals. XANES spectra and Fourier transformation of EXAFS provided a conclusion that the modified Hopeite crystal has a structure of Zn3−xMnx(PO4)2 · 4H2O.

Keywords

Zinc Manganese MnO2 Steel Sheet Metal Component 

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Copyright information

© Chapman and Hall Ltd 1989

Authors and Affiliations

  • N. Sato
    • 1
  • T. Minami
    • 1
  1. 1.Honda Motor Co., Ltd. Materials EngineeringSuzukaJapan

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