High-temperature long-term corrosion of copper in aerobic environment
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This research investigated copper corrosion over a two-year period at three temperatures: 30◦C, 70◦C, and 90◦C. The results showed that at 30◦C, the corrosion layer on copper was approximately 0.6 μm thick, while at 70◦C, it increased to 1.7 μm. However, at 90◦C, the thickness decreased to about 1.0 μm. Analysis using Focused Ion Beam (FIB) showed that the corrosion layer at 70◦C, which had the most corrosion, also had many pores, suggesting faster corrosion. In contrast, at 90◦C, the corrosion product formed many compact granules as secondphase oxide, presumably Cu2O, creating a hard protective layer. Based on these results, for designing underground storage for high-level radioactive waste, it is advisable to maintain the maximum disposal repository temperature between 90◦C and 100◦C during the initial aerobic period. This could improve the long-term corrosion resistance of copper canisters
Abstract
This research investigated copper corrosion over a two-year period at three temperatures: 30◦C, 70◦C, and 90◦C. The results showed that at 30◦C, the corrosion layer on copper was approximately 0.6 μm thick, while at 70◦C, it increased to 1.7 μm. However, at 90◦C, the thickness decreased to about 1.0 μm. Analysis using Focused Ion Beam (FIB) showed that the corrosion layer at 70◦C, which had the most corrosion, also had many pores, suggesting faster corrosion. In contrast, at 90◦C, the corrosion product formed many compact granules as secondphase oxide, presumably Cu2O, creating a hard protective layer. Based on these results, for designing underground storage for high-level radioactive waste, it is advisable to maintain the maximum disposal repository temperature between 90◦C and 100◦C during the initial aerobic period. This could improve the long-term corrosion resistance of copper canisters