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EPMA line analysis of chemical states of chromium
Author(s) -
Hashimoto Satoshi,
Fujiwara Yukihiko,
Kitahara Yasuko,
Tsuchiya Yasuo,
Nishimura Toshiyasu
Publication year - 2001
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.476
Subject(s) - electron microprobe , corrosion , chromium , spectral line , chemical state , analytical chemistry (journal) , line (geometry) , metal , chemistry , metallurgy , materials science , physics , x ray photoelectron spectroscopy , mathematics , nuclear magnetic resonance , geometry , astronomy , chromatography
A novel technique for determining the chemical states of elements with a heterogeneous distribution in samples involving EPMA line analysis is proposed. LLS (linear least squares) calculation was applied to a set of reduced spectra measured in the line analysis. The reduced spectra which have several energy points (including two points for backgrounds) were measured in order to save measuring time. The LLS calculation gives the mole fraction of each chemical state. We applied this method to the analysis of corrosion products formed on Cr‐containing steel after corrosion tests. EPMA mapping revealed that Cr is enriched only in the inner layer of the corrosion products. From the results of the LLS calculation, it was determined that Cr in the corrosion products exists in the trivalent Cr state whereas in the steel Cr is in the metallic state. This result corresponds to the spectra of characteristic x‐rays from the corroded steel. Copyright © 2001 John Wiley & Sons, Ltd.