Accelerated tests for long-term prediction of corrosion in austenitic stainless steels and Ni-Fe-Cr-Mo alloys

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:379688

Sridhar, N; Dunn, D; Cragnolino, G ^[1]

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1. Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses

The effect of applied potential and chloride concentration on localized corrosion and stress corrosion cracking (SCC) of austenitic stainless steels (SSs) and Ni-base alloys was studied. The repassivation potential, E{sub rp} for deep pits was the same as that for crevice corrosion. Laboratory tests over a two-year period and field experience have shown that the E{sub rp} is a conservative parameter to predict the occurrence of both these failure modes. For type 316L SS, the U-bend SCC test was found to be more conservative than the slow strain rates tests under controlled potential conditions for a variety of chloride concentrations. No SCC was observed below the E{sub rp}. The E{sub rp} was also found to correlate with boiling nitric acid test results and the degree of sensitization of alloy 825. The difficulties in using cyclic potentiodynamic polarization tests for assessing localized corrosion, of highly alloyed materials such as alloy C-22 are pointed out. This study is important for high-level nuclear waste disposal programs.

• OSTI ID: 379688
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
ALLOY-NI43FE30CR22MO3
CHLORIDES
CORROSION
CORROSIVE EFFECTS
CRACK PROPAGATION
HIGH-LEVEL RADIOACTIVE WASTES
PASSIVATION
RADIOACTIVE WASTE DISPOSAL
STAINLESS STEEL-316L