New Approaches to Improve High Temperature Corrosion Resistance in Chlorine-Based Atmospheres

Abstract:

Article Preview

Chlorine gas is widely encountered in chemical industries, as well as in waste incinerators and plastic/polymer decomposition mills. The presence of chlorine may significantly reduce the life-time of the components. Under chlorine-based atmospheres, the process of scale formation may be considerably affected and the presence of chlorine usually impedes the formation of a long term protective dense oxide scale. Based on thermodynamic calculations and previous investigations, NiAl and NiAlMo APS-coatings were produced to be used as protection for conventional steels against chlorine corrosion. Indeed, thermodynamic diagrams showed that molybdenum should have a positive behaviour in “reducing”-chloridizing atmospheres, whereas aluminium has a positive behaviour in “oxidizing”-chloridizing atmospheres. Coatings of approximatively 300 μm thickness were thermally sprayed on Armco Iron and on a commercial ferritic 18 Cr steel. This work presents the corrosion behaviour of NiAl and NiAlMo APS-coatings under chlorine-based atmospheres at 800°C. In addition, metallographic characterisation as well as EPMA investigations of the coating cross sections were carried out before and after the corrosion tests.

Info:

Periodical:

Materials Science Forum (Volumes 595-598)

Edited by:

Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu

Pages:

307-321

DOI:

10.4028/www.scientific.net/MSF.595-598.307

Citation:

H. Latreche et al., "New Approaches to Improve High Temperature Corrosion Resistance in Chlorine-Based Atmospheres", Materials Science Forum, Vols. 595-598, pp. 307-321, 2008

Online since:

September 2008

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.