Influence of Cr and Mo on the passivation of stainless steel 430 (18Cr) and 444 (18Cr–2Mo): In situ XANES study

Authors :: Kyoo Kim
Hee San Kim
Jung Ho Je
Seok Joo Doh
Jay Min Lee
Jin Suk Kim
Young Duk Lee
Yeukuang Hwu
Source :: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 199:211-215
Publication Year :: 2003
Publisher :: Elsevier BV, 2003.
Abstract: We have studied the influence of metal elements on the passivation of stainless steel (SS) 430 (18Cr) and 444 (18Cr–2Mo) by real time X-ray absorption near edge spectroscopy. We developed an electro-chemical cell that is suitable for in situ electro-chemistry experiments. The behavior of Fe, Cr and Mo elements of SS 430 and 444 was studied in passive region reaction in a borate buffer solution (pH 7.0). We found that the Cr 2 O 3 /Fe 2 O 3 ratio gradually decreased with passivation time due to the oxidation of Cr 2 O 3 to CrO 4 2− , indicating weakening of passivity. In the meanwhile, the amount of Mo at passive films increased with passivation time. The improvement of passivity in the SS 444 is mainly attributed to the substitution of Cr oxide by Mo oxide in the passive film.

Subjects :: Nuclear and High Energy Physics
Materials science
Passivation
Inorganic chemistry
Metallurgy
Oxide
Refractory metals
chemistry.chemical_element
XANES
Metal
Chromium
chemistry.chemical_compound
Transition metal
chemistry
Molybdenum
visual_art
visual_art.visual_art_medium
Instrumentation

ISSN :: 0168583X
Volume :: 199
Database :: OpenAIRE
Journal :: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Accession number :: edsair.doi...........5da0a23c98e78dd9e27f813d53b86db5
Full Text :: https://doi.org/10.1016/s0168-583x(02)01548-3

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