Crevice corrosion of duplex stainless steel in simulated sour gas environments
The crevice corrosion behavior of 22%Cr duplex stainless steel, which has come into wide use for its high strength and SCC resistance, was investigated in the simulated sour gas conditions below 80/sup 0/C. The crevice corrosion is accelerated by following factors; partial pressure of H2S, temperature, decreasing pH of the test solution, and the addition of elemental sulfur. Compared the duplex stainless steel and Type 316 stainless steel, the former was more resistant to the crevice corrosion in H2S-Cl/sup -/ environment. A simple model of the crevice corrosion was proposed, in which the generation process and the crevice corrosion mode were discussed. The incubation time of crevice corrosion based on this model was calculated and the effect of the crevice gap, the rate of the metal dissolution, the depassivation pH, and the initial pH of the test solution was clarified. The mode of crevice corrosion was changed with the partial pressure of H2S, which can be explained by the stability of NiS film and the depassivation pH in the crevice.
- OSTI ID:
- 7203650
- Report Number(s):
- CONF-870314-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
033000 -- Natural Gas-- Properties & Composition
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION PRODUCTS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACKS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
MATHEMATICAL MODELS
MOLYBDENUM ALLOYS
NATURAL GAS
NICKEL ALLOYS
NICKEL COMPOUNDS
NICKEL SULFIDES
PASSIVATION
PH VALUE
PITTING CORROSION
REACTION KINETICS
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
STRESS CORROSION
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT
TRANSITION ELEMENT COMPOUNDS