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Effects of Al Additions on Sulfidation Resistance of Some Fe-cr-ni Alloys.

Authors
Dunning-JS; Rhoads-SC
Source
MISSING :19 pages
Link
NIOSHTIC No.
10007339
Abstract
The objective of this research by the U.S. Bureau of Mines was to determine the effects of al additions on the sulfidation resistance of fe-cr-ni alloys. A series of fe-cr-ni alloys with and without additions of 4 pct al were tested in a wet s vapor atmosphere at 677 deg c. A study of the morphology and composition of corrosion scales indicated a different corrosion mechanism for al-free alloys compared with al-containing alloys. Aluminum-containing alloys formed a compact, tightly adherent layer at the metal-scale interface that reduced corrosion rates by a factor of 3 to 10 compared with that of al-free alloys. The thin, adherent al- containing scale limited inward diffusion of o and s to the base metal and outward diffusion of ni from the base metal. Aluminum- containing alloys formed a three-layer scale on oxidizing-s environments, while al-free alloys formed a less protective two- layer scale.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9278
NIOSH Division
ALRC;
Source Name
MISSING
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