Analysis of Valence for Chromate Conversion Coatings Using Laboratory XAFS Spectrometer and a Comparison with X-ray Photoelectron Spectroscopy

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  • Miyauchi Hiroya
    Department of Materials Science and Engineering, Kyoto University Kyoto Prefectural Technology Center for Small and Medium Enterprises
  • Yamamoto Takashi
    Faculty of Integrated Arts and Sciences, University of Tokushima
  • Kitagaki Hiroshi
    Kyoto Prefectural Technology Center for Small and Medium Enterprises
  • Nakamura Tomohiko
    Kyoto Prefectural Technology Center for Small and Medium Enterprises
  • Nakanishi Sadahiro
    Kyoto Prefectural Technology Center for Small and Medium Enterprises
  • Kawai Jun
    Department of Materials Science and Engineering, Kyoto University

Bibliographic Information

Other Title
  • 実験室系Ｘ線吸収分光分析装置を用いたクロメート皮膜中クロムの価数評価及びＸ線光電子スペクトルとの比較検討
  • ジッケンシツケイ Xセン キュウシュウ ブンコウ ブンセキ ソウチ オ モチイタ クロメート ヒマク チュウ クロム ノ カスウ ヒョウカ オヨビ Xセン コウデンシ スペクトル ト ノ ヒカク ケントウ

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Description

We performed a nondestructive and in laboratory evaluation technique of hexavalent chromium (Cr(VI)) in chromate conversion coatings using a laboratory X-ray absorption fine structure (XAFS) spectrometer equipped with W anode X-ray tube. The recorded XANES spectrum of a chromate conversion coating sample with fluorescence mode possessed the Cr–K X-ray absorption edge. We have obtained calibration curves of the ratio of Cr(VI)/Cr(III) by the height of pre-edge peak and the Cr–K X-ray absorption edge energy of the reference samples prepared by Cr2O3 (Cr(III)) and CrO3 (Cr(VI)) particle reagents. The calibration curves showed the high correlation coefficients such as 1.00 for the height of pre-edge peak and 0.99 for the value of the energy on the Cr–K X-ray absorption edge. The ratio of Cr(VI)/Cr(III) in the chromate conversion coating has also been evaluated by the X-ray photoelectron spectroscopy (XPS) and 1,5-diphenyl-carbazide absorption spectrometry (DPC) methods. The ratio of Cr(VI)/Cr(III) evaluated by the laboratory XAFS spectrometer was almost identical to that by XPS method.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 95 (12), 864-869, 2009

    The Iron and Steel Institute of Japan

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