Mitigation of stress corrosion cracking of AISI 304 stainless steel in oxygenated water at 289 degree C by organic species at low concentration
In constant-extension-rate tests on sensitized AISI 304 stainless steel (SS) at 289{degree}C, some organic substances (oxygen scavengers) in feedwater containing {approximately}0.2 ppm dissolved oxygen decrease effluent oxygen concentration, electrochemical potential (ECP) of the steel, and stress corrosion cracking (SCC) susceptibility to very low levels. Other organic substances neither decrease oxygen concentration nor ECP of the steel significantly, but also mitigate SCC susceptibility relative to that in high-purity oxygenated water. The latter species apparently block active sites where cathodic reduction of oxygen occurs and thereby limit anodic dissolution of metal at the crack tip in a slip-dissolution mechanism of crack advance. In SCC tests on fracture-mechanics-type specimens under high-load-ratio, low-frequency cyclic loading conditions at 289{degree}C, the organic inhibitors at a concentration of {approximately}1.0 ppm stop crack growth in the sensitized steel, but are not effective in oxygenated water containing ionic impurities such as sulfate or chloride at the 0.1-ppm level. These results are consistent with the site blockage mechanism for different species that undergo cathodic reduction and control the rate of crack growth of the steel in the SCC tests. 39 refs., 5 figs., 4 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- NRC
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7024009
- Report Number(s):
- CONF-900403-7; ON: DE90005631
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360106 -- Metals & Alloys-- Radiation Effects
ALLOYS
AUSTENITIC STEELS
BWR TYPE REACTORS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COOLING SYSTEMS
CORROSION
CORROSION INHIBITORS
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
ENERGY SYSTEMS
FEEDWATER
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HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
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MITIGATION
NICKEL ALLOYS
ORGANIC ACIDS
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OXYGEN COMPOUNDS
PWR TYPE REACTORS
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SECONDARY COOLANT CIRCUITS
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
STRESS CORROSION
WATER
WATER COOLED REACTORS
WATER MODERATED REACTORS