Paper Titles
Influence of Cooling Rate and Steel Composition on the Scale Failure Characteristics during Cooling of Si-Containing Low Carbon Steels
p.505
Development and Application of High Cr-High Si-Fe-Ni Alloys to High Efficiency Waste-To-Energy Boilers
p.513
Experiences with Inconel 625 in Biomass and Waste Incineration Plants
p.523
Hot Corrosion Monitoring of Waste Incineration Corrosion Processes Using Electrochemical Techniques
p.531
Corrosivity of KCl(g) at Temperatures above Its Dew Point - Initial Stages of the High Temperature Corrosion of Alloy Sanicro 28 at 600°C
p.539
Influence of Chlorine, Sulphur and Water Vapor on High Temperature Corrosion of Fe, Cr, Ni Alloys for Waste Incinerators
p.547
Effect of Alloying Elements on Corrosion Resistance of Ni-Base Cast Alloys in Waste Incineration Environments
p.555
The Influence of Sulfur Additions on the Corrosive Environments in a Waste-Fired CFB Boiler
p.563
An Overview of Metal Dusting in Synthesis Gas Environments
p.571

Corrosivity of KCl(g) at Temperatures above Its Dew Point - Initial Stages of the High Temperature Corrosion of Alloy Sanicro 28 at 600°C

Article Preview

Abstract:

The influence of gaseous KCl on the high temperature oxidation of alloy Sanicro 28 (27Cr31Ni) at 600°C in 5% O2 (N2 in balance) is reported. The samples were exposed isothermally in flowing gas, the dew point of KCl being 590°C corresponding to a partial pressure of KCl of about 2·10-6 atm. The exposure time was 24, 72 and 168 hours. The samples were investigated by gravimetry, grazing incidence XRD, SEM/EDX and AES. The results show that the oxidation of Sanicro 28 at 600°C is accelerated by KCl(g) at metal temperatures above the dew point of the salt. KCl(g) reacts with the protective chromium rich oxide ((Fe1-xCrx)2O3) forming K2CrO4. The resulting chromium depletion of the oxide gives an increasing oxidation rate but does not trigger “breakaway” corrosion. The distribution of potassium chromate on the sample surface is strongly flow-dependent, showing that the rate of formation of potassium chromate is limited by the rate of transport of KCl(g) to the surface. No evidence for chlorine was found on the corroded samples by AES profiling or EDX.

You might also be interested in these eBooks
High-Temperature Oxidation and Corrosion 2005 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

539-546

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.539

Citation:

Cite this paper

Online since:

August 2006

Authors:

C. Pettersson, Jan Erik Svensson, Lars Gunnar Johansson

Keywords:

Alkali-Induced High Temperature Corrosion, Chromate Formation, Chromia-Forming Steels, KCl(g), Sanicro 28

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] M. Montgomery and A. Karlsson: Materials and Corrosion Vol. 50 (1999), pp.579-584.

Google Scholar

[2] A. Zahs, M. Spiegel and H.J. Grabke: Corrosion Science Vol. 42 (2000), pp.1093-1122.

Google Scholar

[3] X. Zheng and R.A. Rapp, Oxidation of Metals Vol. 48(5/6) (1997), pp.527-551.

Google Scholar

[4] J. Pettersson, H. Asteman, J. -E. Svensson and L. -G. Johansson: Accepted to Oxidation of metals.

Google Scholar

[5] C. Pettersson, J. Pettersson, H. Asteman, J. -E. Svensson and L. -G. Johansson: Accepted to Corrosion Science.

Google Scholar

[6] C. Pettersson, J. -E. Svensson and L. -G. Johansson: To be published.

Google Scholar

[7] M. Spiegel, C. Schroer, and H.J. Grabke: Materials Science Forum Vol. 251-254 (1997), pp.527-534.

Google Scholar

[8] M. Spiegel and H.J. Grabke: Materials and Corrosion Vol. 46 (1995), pp.121-131.

Google Scholar

[9] H.J. Grabke, E. Reese, and M. Spiegel: Corrosion Science Vol. 37 (1995), pp.1023-1043.

Google Scholar

[10] I. Barin: Thermochemical Data of Pure Substances (VCH 1995).

Google Scholar

[11] Y. Shinata: Oxidation of Metals Vol. 27 (1987), pp.315-332.

Google Scholar

[12] H.P. Nielsen, et al.: Progress in Energy and Combustion Science Vol. 26 (2000), pp.283-298.

Google Scholar

[13] Y. Shu, F. Wang and W. Wu: Oxidation of Metals Vol. 51 (1999), pp.97-110.

Google Scholar

[14] K. Segerdahl, J. Pettersson, J. -E. Svensson and L. -G- Johansson: Materials Science Forum Vol. 461-464 (2004), pp.109-116.

Google Scholar

[15] J. Pettersson: Licentiate Thesis (Chalmers University of Technology, Göteborg 2005).

Google Scholar