Stability of chromium oxide scales in oxygen-sulfur-containing environments at elevated temperatures

Conference · Wed Aug 01 04:00:00 EDT 1984

OSTI ID:6887445

Baxter, D J; Natesan, K

Structural Fe-Cr-Ni alloys rely upon their ability to form and maintain protective oxide surface scales to resist rapid breakdown in aggressive gaseous environments at elevated temperatures. Formation of a protective oxide is dependent upon both thermodynamic and kinetic considerations, while in addition, its mechanical properties will influence stability over long periods of service. It is shown that refractory metal additions of Zr or Nb promote oxide formation over rapid sulfidation attack in environments containing oxygen and sulfur. The presence of Si and Mn in a commercial alloy (310 stainless steel), on the other hand, inhibits formation and retention of a protective surface oxide. Unlike Zr, Nb contributes to surface scale formation, which results in enhanced protection of preformed scales. The mode of scale breakdown is similar for all alloys investigated, with defects and impurities in the Cr oxide playing a dominant role. All tests were carried out in gaseous environments representative of coal gasification processes. 23 references, 11 figures.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6887445
• Report Number(s): CONF-840978-2; ON: DE84016232
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION PLANTS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MICROSCOPY
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SCALING
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
SILICON ALLOYS
STAINLESS STEEL-310
STAINLESS STEELS
STEELS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS