Effects of cold work, sensitization treatment, and the combination on corrosion behavior of stainless steels in nitric acid
- Electric Power Industry, Komae, Tokyo (Japan). Central Research Inst.
In a reprocessing process, spent nuclear fuels from light-water reactors are dissolved in nitric acid (HNO{sub 3}) to separate and recover the fissile materials such as uranium and plutonium from the radioactive fission products. Corrosion behavior of two stainless steels (SS) was investigated in nitric acid (HNO{sub 3}) for the effect of cold work (CW), sensitization heat treatment (Sens.), and a combination (CW + Sens.). The corrosion rate of the solution-treated type 304 SS (UNS S30400) with extra-low carbon (type 304ELC SS (UNS S30403)) increased with time and reached constant values after 1,000 h of immersion. However, constant corrosion rates were obtained for 25% Cr-20% Ni-Nb (type 310Nb SS [UNS S31040]) from the initial stage of immersion. CW mitigated corrosion of the solution-treated SS. The effect of CW was different on the two types of SS, with the sensitization heat-treated type 304 ELC SS showing higher corrosion rates and type 310Nb SS lower corrosion rates by CW. Corrosion resistance of type 310Nb SS was superior to type 304 ELC SS after all treatments. Chromium concentration of the sensitization-treated type 304 ELC SS was lower in the grain-boundary region than of the solution-treated one, although no chromium carbide precipitation was observed. This may have been the cause of intergranular corrosion enhancement by sensitization treatment.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 644350
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 4 Vol. 54; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of cold work, sensitization treatment and its combination on corrosion behavior of stainless steels in nitric acid
In Situ Observations of the Early Stages of Localized Corrosion in Type 304 SS Using the Electrochemical Atomic Force Microscope
Effect of dissolved ozone on corrosion behavior of stainless steels in artificial seawater
Book
·
Sun Nov 30 23:00:00 EST 1997
·
OSTI ID:548558
In Situ Observations of the Early Stages of Localized Corrosion in Type 304 SS Using the Electrochemical Atomic Force Microscope
Journal Article
·
Thu Aug 31 00:00:00 EDT 2000
· Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, 288(1):54-60
·
OSTI ID:15002709
Effect of dissolved ozone on corrosion behavior of stainless steels in artificial seawater
Journal Article
·
Thu Oct 01 00:00:00 EDT 1998
· Corrosion
·
OSTI ID:669831