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http://dx.doi.org/10.7733/jkrws.2011.9.2.93

The Corrosion Behavior of Cold-Rolled 304 Stainless Steel In Salt Spray Environments  

Chiang, M.F. (Institute of Nuclear Energy Research)
Young, M.C. (Institute of Nuclear Energy Research)
Huang, J.Y. (Institute of Nuclear Energy Research)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.9, no.2, 2011 , pp. 93-98 More about this Journal
Abstract
Saline corrosion is one of the major degradation mechanisms for stainless steel type 304 (SS304) dry storage cask during the spent fuel interim storage period. Slow strain rate test (SSRT) and neutral salt spray test (NSS) were performed at $85^{\circ}C$ and $200^{\circ}C$ with 0.5 wt% sodium chloride mist sprayed on the cold-rolled SS304 specimens of different degrees of reduction in this study. The weight changes of the NSS specimens tested at $85^{\circ}C$ for 2000 hours differed greatly from those at $200^{\circ}C$. The weight loss of NSS specimens was not significant at $85^{\circ}C$ but the weight gain decreased gradually with increasing the cold-rolled reduction. The yield strength (YS) and ultimate tensile stress (UTS) values obtained from the SSRT tests for lightly cold-rolled specimens in the salt spray environment at $85^{\circ}C$ and $200^{\circ}C$ are slightly lower than in air. But for those with 20% reductions, the specimen strengths were no longer changed by the saline corrosion. The preliminary results demonstrated that the quality and performance of cold-rolled SS304 is acceptable for fabrication of dry storage casks. However, more work on the corrosion behavior of cold-rolled stainless steel in the saline atmosphere is needed to better understand its long-term performance.
Keywords
storage cask; spent fuel; saline corrosion; stainless steel; strength;
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