염분분사 환경에서 냉연 304 스테인레스강의 부식거동

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

M. F. Chiang, M.C. Young, J.Y. Huang

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°C and 200°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°C for 2000 hours differed greatly from those at 200°C. The weight loss of NSS specimens was not significant at 85°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°C and 200°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

Key Words : storage cask, spent fuel, saline corrosion, stainless steel, strength, 저장용기, 사용후핵연료, 염분분위기부식, 스테인레스강, 강도

Reference

JNFCWT

Online Submission

Korean Radioactive
Waste Society (KRS)

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