Corrosion rate evaluations of structural materials for a iodine-sulfur thermochemical water-splitting cycle
- Japan Atomic Energy Agency, Narita-cho, 4002, Oarai-machi, Higashi Ibaraki-gun, Ibaraki-ken, 311-1393 (Japan)
- Chiyoda Advanced Solutions Company, 3-13 Moriya-cho, Kanagawa-ku, Yokohama, 221-0022 (Japan)
- Chiyoda Corporation, 3-13 Moriya-cho, Kanagawa-ku, Yokohama, 221-0022 (Japan)
The iodine-sulfur thermochemical cycle for hydrogen production takes place in very corrosive environments. To evaluate the corrosion rate of structural materials, corrosion tests on Bunsen reaction environments were conducted using glass apparatus, which focused on welded area corrosions and crevice corrosions for the fabrication of equipment. Prepared test specimens of tantalum and zirconium were exposed to solutions consisting of HI, H{sub 2}SO{sub 4}, I{sub 2} and H{sub 2}O at 120 degrees C for 100 or 500 hours at the atmospheric pressure. Two types of solutions were employed to simulate the process environments of the Bunsen reaction. The compositions of the solutions were H{sub 2}SO{sub 4}:HI:H{sub 2}O:I{sub 2}=0.50:0.001:0.498:0.001 (weight ratio, H{sub 2}SO{sub 4}-rich phase) and H{sub 2}SO{sub 4}:HI:H{sub 2}O:I{sub 2}=0.001:0.10:0.099:0.8 (weight ratio, HI-rich phase). After the exposure, the corrosion rates were obtained by the weight loss of each specimen. For the tantalum, their welded area corrosions and crevice corrosions exhibit appropriate corrosion resistance (below 0.02 g/m{sup 2} hr) in both solutions. As for the zirconium, higher corrosion rates (0.02 to 0.05 g/m{sup 2} hr) were observed in the HI-rich phase on the crevice corrosions. Additionally, pitting corrosions were found on Zr after 500 hours of immersion. (authors)
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 21021008
- Resource Relation:
- Conference: 2006 International congress on advances in nuclear power plants - ICAPP'06, Reno - Nevada (United States), 4-8 Jun 2006; Other Information: Country of input: France; 17 refs; Related Information: In: Proceedings of the 2006 international congress on advances in nuclear power plants - ICAPP'06, 2734 pages.
- Country of Publication:
- United States
- Language:
- English
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