ID 111252
Title Alternative
Analysis of Valence for Chromate Conversion Coatings Using Laboratory XAFS Spectrometer and a Comparison with X-ray Photoelectron Spectroscopy
Author
Miyauchi, Hiroya Kyoto University|Kyoto Prefectural Technology Center for Small and Medium Enterprises
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 Kyoto University
Keywords
laboratory XAFS
XANES
chromate conversion coating
hexavalent chromium
Content Type
Journal Article
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 Title
Tetsu-to-Hagané
ISSN
18832954
00211575
NCID
AA12060774
AN00151251
Publisher
一般社団法人 日本鉄鋼協会
Volume
95
Issue
12
Start Page
864
End Page
869
Published Date
2009-12-10
Rights
© 2009 一般社団法人 日本鉄鋼協会
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
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language
jpn
TextVersion
Publisher
departments
Science and Technology