Influence of temperature and the role of chromium on the kinetics of sulfidation of 310 stainless steel

Journal Article · Sat Apr 01 00:00:00 EST 1978 · Oxid. Met.; (United States)

OSTI ID:6783641

Bhogeswara Rao, D; Nelson, H G

The sulfidation of 310 stainless steel was studied over the temperature range from 910 to 1285/sup 0/K. By adjusting the ratio of hydrogen to hydrogen sulfide, variations in sulfur potential were obtained. The effect of temperature on sulfidation was determined at three different sulfur potentials: 39 N m/sup -2/, 1.4 x 10/sup -2/ N m/sup -2/, and 1.5 x 10/sup -4/ N m/sup -2/. All sulfide scales contained one or two surface layers in addition to a subscale. At a given temperature and sulfur potential the weight gain obeyed the parabolic rate law after an initial transition period. When the log of the parabolic rate constant is plotted as a function of the reciprocal of the absolute temperature, a break in the curves is observed at around 1145/sup 0/K for p/sub s/sub 2// less than or equal to 10/sup -2/ N m/sup -2/. The temperature at which the break occurred was termed a transition temperature. Below the transition temperature the activation energy was found to be approximately 125 kJ mole/sup -1/. Above the transition temperature the rate of sulfidation was independent of temperature but dependent on the Fe : Cr ratio in the iron--chromium--sulfide layer of OL-I. Below the transition temperature the diffusion of Fe and Ni through OL-I contributes to the scale formation, whereas above the transition temperature the diffusion of chromium through OL-I controls the scale formation.

• Research Organization: NASA-Ames Research Center, Moffett Field, CA
• OSTI ID: 6783641
• Journal Information: Oxid. Met.; (United States), Vol. 12:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
CHROMIUM
METALLURGICAL EFFECTS
COAL GASIFICATION
BUILDING MATERIALS
STAINLESS STEEL-310
CORROSION
SULFUR
CORROSIVE EFFECTS
ACTIVATION ENERGY
CORROSION PRODUCTS
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
GRAIN BOUNDARIES
HYDROGEN SULFIDES
IRON
MICROSTRUCTURE
NICKEL
SCALING
SEGREGATION
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
NICKEL ALLOYS
NONMETALS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
STAINLESS STEELS
STEELS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
010404 - Coal
Lignite
& Peat- Gasification