Mechanisms of intergranular attack and stress corrosion cracking of Alloy 600 by high-temperature caustic solutions containing impurities: Final report

Technical Report · Wed Jul 01 04:00:00 EDT 1987

OSTI ID:6298333

Van Rooyen, D; Bandy, R

The mechanisms of intergranular attack (IGA) and intergranular stress corrosion cracking (SCC) of Alloy 600 are investigated in high temperature sodium hydroxide environments contaminated with impurities such as carbonate, sulfate, silicate, magnetite, and chromic oxide. Results show that caustic alone can cause both IGA and SCC. The effects of electrochemical potential, stress, time, temperature and the metallurgical state of Alloy 600 on the IGA and SCC are discussed. It appears that both IGA and SCC are manifestations of a general intergranular failure process. In the presence of adverse potential, stress, strain rate and temperature, the slower IGA process is generally replaced by the faster SCC process.

• Research Organization: Brookhaven National Lab., Upton, NY (USA); California State Univ., Sacramento (USA); Electric Power Research Inst., Palo Alto, CA (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6298333
• Report Number(s): EPRI-NP-5129; ON: DE87012820
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CORROSION
CRACK PROPAGATION
CREVICE CORROSION
INCONEL 600
INCONEL ALLOYS
INTERGRANULAR CORROSION
IRON ALLOYS
MATERIALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
REACTOR MATERIALS
STEAM GENERATORS
STRESS CORROSION
THERMAL POWER PLANTS
VAPOR GENERATORS
WATER CHEMISTRY