Paper Title:
New Approaches to Improve High Temperature Corrosion Resistance in Chlorine-Based Atmospheres
  Abstract

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, G. Tegeder, G. Wolf, P. J. Masset, T. Weber, M. Schütze, "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
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$32.00
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