The effect of yttrium on scale formation and breakdown of Fe-Cr-Al in mixed gas

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Oxidation of Metals; (USA)

DOI:https://doi.org/10.1007/BF00666810· OSTI ID:6537054

Kung, Sicheng; Srinivasan, V ^[1]

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1. Universal Energy Systems, Dayton, OH (USA)

The effects of 1 wt.% yttrium addition to an iron-base model alloy, Fe-25Cr-6Al, on the scale formation and breakdown mechanisms in a mixed gas at temperatures 500-700{degree}C were studied. In this environment, the equilibrium gas contained sulfur and oxygen at high and low vapor pressures, respectively. During the exposure, the formation of an alumina scale was favored kinetically on the surfaces of the alloys. The oxide scale formed on the base (Y-free) alloy had a fine-grained structure which exhibited excellent sulfidation/oxidation resistance. Based on thermodynamic calculations, the probable phases forming on the alloy surface in the oxidizing/sulfidizing environment were predicted, and a qualitative model for the corrosion mechanisms was proposed.

• OSTI ID: 6537054
• Journal Information: Oxidation of Metals; (USA), Journal Name: Oxidation of Metals; (USA) Vol. 33:5-6; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOY SYSTEMS
ALLOYS
CHEMICAL REACTIONS
CONTROL
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDATION
SCALE CONTROL
SULFIDATION
TERNARY ALLOY SYSTEMS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
YTTRIUM