Search: onr:"swepub:oai:gup.ub.gu.se/80831" >
Protective and nonp...
Protective and nonprotective behavior of 11% Cr steel in O-2+H2O environment at 450-700 degrees C
-
- Segerdahl, K. (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Svensson, Jan-Erik, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Johansson, Lars-Gunnar, 1952 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg
-
(creator_code:org_t)
- The Electrochemical Society, 2004
- 2004
- English.
-
In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 151:7
- Related links:
-
http://dx.doi.org/10...
-
show more...
-
https://gup.ub.gu.se...
-
https://doi.org/10.1...
-
https://research.cha...
-
show less...
Abstract
Subject headings
Close
- The oxidation of X20 steel (CrMoV 11 1) in dry O2 and O2+10 or 40%H2O was investigated at 450-700°C. The flow rate was 2.5 cm/s and the exposure time was 168 h. The oxidized samples were investigated gravimetrically and by a number of surface analytical techniques including environmental scanning electron microscopy/energy-dispersive X-ray, grazing incidence X-ray diffraction, and glow discharge optical emission spectroscopy. The oxidation behavior was strongly influenced by temperature and pH2O. In dry O2 the scale was protective up to 700°C, the chromium concentration in the scale increasing with temperature. In O2+H2O environment chromium was lost by vaporization of CrO2(OH)2, resulting in a deterioration of the ability of the oxide to protect the metal. This resulted in rapid oxidation in O2+40%H2O at high temperature (650 and 700°C) and at low temperature (500°C), forming a thick duplex (Fe2O3/Fe2CrO4) scale. In the intermediate temperature range (550-600°C) the rate of oxidation was not increased. The results are interpreted in terms of the ability of the material to compensate for chromium vaporization by supplying chromium to the protective oxide by diffusion.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Keyword
- high-temperature oxidation
- pf utility boiler
- chromium steel
- corrosion
- straw
- corrosion
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database