ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Chlorine gas is widely encountered in chemical industries, as well as in wasteincinerators and plastic/polymer decomposition mills. The presence of chlorine may significantlyreduce the life-time of the components. Under chlorine-based atmospheres, the process of scaleformation may be considerably affected and the presence of chlorine usually impedes the formationof a long term protective dense oxide scale. Based on thermodynamic calculations and previousinvestigations, NiAl and NiAlMo APS-coatings were produced to be used as protection forconventional steels against chlorine corrosion. Indeed, thermodynamic diagrams showed thatmolybdenum should have a positive behaviour in “reducing”-chloridizing atmospheres, whereasaluminium has a positive behaviour in “oxidizing”-chloridizing atmospheres. Coatings ofapproximatively 300 μm thickness were thermally sprayed on Armco Iron and on a commercialferritic 18 Cr steel. This work presents the corrosion behaviour of NiAl and NiAlMo APS-coatingsunder chlorine-based atmospheres at 800°C. In addition, metallographic characterisation as well asEPMA investigations of the coating cross sections were carried out before and after the corrosiontests
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.595-598.307.pdf
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