In situ analysis of passive films on alloy 600 by modulated UV-visible reflection spectroscopy

Izumi Muto, Nobuyoshi Hara, Katsuhisa Sugimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Modulated reflection spectra of passive films have been measured in 1 kmol·m-3 Na2SO4 (pH 2.0 and 6.0), 0.15 kmol·m-3 H3BO3+0.0375 kmol·m-3 Na2B4O7 (pH 8.45) and 0.1 kmol·m-3LiOH (ph 12.8) solutions, respectively. Quantitative relations between the characteristic of spectra and the composition of the films have been derived from the spectra for thin composite films of NiO-Cr2O3-Fe2O3 prepared on Pt by MO-CVD. From these relations, cationic mass fractions of Ni2+, Cr3 and Fe3+ ions, XNi, XCr and XFe of passive films were determined. The cationic mass fractions changed with potential; for the films formed at pH 2.0, the value of XCr decreased from 0.7 at 0.0V to 0.1 at 1.0V and at the same time, the value of XFe increased from 0.05 to 0.3 with increasing potential. This indicates that Cr3+ ions are substantially enriched in the passive films and Fe3+ ions are in the transpassive films. The value of XCr for the passive films gradually decreased with increasing pH, while that of XFe was almost independent of pH.

Original languageEnglish
Pages (from-to)664-671
Number of pages8
JournalBoshoku Gijutsu
Issue number11
Publication statusPublished - 1988

ASJC Scopus subject areas

  • Engineering(all)


Dive into the research topics of 'In situ analysis of passive films on alloy 600 by modulated UV-visible reflection spectroscopy'. Together they form a unique fingerprint.

Cite this