ISSN:
1573-4889
Keywords:
sulfidation
;
sulfidation/oxidation
;
hot corrosion
;
nickel alloys
;
cobalt alloys
;
oxide dispersions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The presence of a fine dispersion of a stable oxide is known to have a beneficial effect on the oxidation resistance of nickel- and cobalt-base heat-resisting alloys. This paper presents some preliminary experimental results relating to the hot-corrosion resistance of these alloys. Alloys forming Cr 2O3 scales appear to be resistant to oxidation when coated with sodium sulfate, whereas an alloy normally forming an Al 2O3 scale suffers accelerated attack. During sulfidation some of the alloys suffer an accelerated degradation, with sulfur penetrating rapidly along what appear to be grain boundaries. The same effect is noted in sulfidation-oxidation experiments, when the Cr 2O3-forming alloys suffer accelerated oxidation, the effect of the dispersoid being apparently removed. An Al 2O3-forming alloy resists this form of attack well. The sodium sulfate-coated test is probably a good guide to the behavior under weakly corroding conditions, whereas the sulfidation-oxidation test may give a better indication of the behavior under highly aggressive conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00603387
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