Oxidation of a chromia-forming nickel base alloy at high temperature in mixed diluted CO/H2O atmospheres

Corrosion of a chromia-forming nickel base alloy, Haynes 230(R), has been investigated under impure helium containing a few Pa of CO and H2O at 900 deg C. It has been found that this alloy reacts simultaneously with CO and H2O. Oxidation by CO has been revealed to occur mainly in the first hours. CO...

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Bibliographic Details
Published inCorrosion science Vol. 51; no. 4; pp. 752 - 760
Main Authors ROUILLARD, F, CABET, C, WOLSKI, K, PIJOLAT, M
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier 01.04.2009
Subjects
Applied sciences
Chemical and Process Engineering
Corrosion
Corrosion environments
Engineering Sciences
Exact sciences and technology
Materials
Metals. Metallurgy
Nickel base alloys
A
Temperature
C. Reactor conditions
Forming
Secondary ion mass spectrometry
High temperature
Superalloys
Superalloy
B. SIMS
C. Oxidation
Oxidation
High temperature corrosion
C. High temperature Corrosion
SIMS
Reactor conditions
High temperature Corrosion
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Summary:Corrosion of a chromia-forming nickel base alloy, Haynes 230(R), has been investigated under impure helium containing a few Pa of CO and H2O at 900 deg C. It has been found that this alloy reacts simultaneously with CO and H2O. Oxidation by CO has been revealed to occur mainly in the first hours. CO diffuses through the scale via short-circuit pathways and oxidizes Al, Cr and Si at the oxide/metal interface. Kinetics of CO oxidation has been investigated and several rate limiting steps are proposed. In the long term, H2O is the major oxidant of chromia-forming nickel base alloys in impure helium.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2009.01.019