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Kanari, Moriyasu*; Abe, Tetsuya; Enoeda, Mikio; *; *; Shimizu, Katsusuke*; *; Takatsu, Hideyuki
JAERI-Research 98-029, 23 Pages, 1998/06
JAERI-Research-98-029.pdf:2.51MB
no abstracts in English
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JAERI-M 82-196, 29 Pages, 1982/12
no abstracts in English
Iwatsuki, Jin; Ioka, Ikuo; Kuriki, Yoshiro*; Kubo, Shinji; Inagaki, Yoshiyuki
no journal, ,
JAEA has pursued the development of a thermochemical water-splitting iodine-sulfur process (IS process) to realize hydrogen production systems for high temperature gas cooled reactors. The IS process is a chemical process to produce hydrogen and oxygen from water by combining chemical reactions of iodine (I) and sulfur (S). One of important tasks is to develop corrosion-resistant structural materials because the process uses very corrosive chemicals such as sulfuric acid. A surface reforming technique forming a corrosion-proof coating was introduced to develop a material which is provided with workability, strength, and corrosion resistance. Specimens was fabricated using a silicon plasma spraying, which were examined for corrosion resistance in sulfuric acid solution, concentrations of 47wt% and 95wt%, at temperature of the boiling points. Test results showed the technique is promising to improve corrosion resistance in such harsh environment.
Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki
no journal, ,
Hydrogen is one of the promising major energy sources in the future. IS process is one of candidates for the large-scale production of hydrogen using heat from solar power. Severe corrosive environment which is thermal decomposition of sulfuric acid exists in the IS process. To achieve a massive hydrogen production system, one of the key factors is the development of structural materials. A hybrid material that combined the corrosion-resistant and the pressure-resistant functions was made by a plasma spraying and laser treatment. The flat specimen of the hybrid material showed enough corrosion resistance in boiling sulfuric acid. To confirm the applicability of the hybrid material as the structural material, corrosion tests were performed in 98 wt.% boiling sulfuric acid using round bar specimens with the curved surface. The specimens showed enough corrosion resistance in boiling sulfuric acid though some cracks were observed in the surface layer from the cross section observation.
Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki
no journal, ,
IS process is one of candidates for the large-scale production of hydrogen. Thermal decomposition of sulfuric acid exists in the IS process. A hybrid material with the corrosion-resistance and the ductility was made by a plasma spraying and laser treatment. The specimen had excellent corrosion resistance in the condition of 95 mass% boiling sulfuric acid. The corrosion rate of the specimen in 47 mass% boiling sulfuric acid was fifty times higher than that in 95 mass% boiling sulfuric acid. It seems that the cracks of the surface layer weren't sealed up perfectly in the condition of 47 mass% boiling sulfuric acid. To improve the corrosion resistance of the specimen, the specimen was treated with a thermal treatment for pre-oxidation. The pre-oxidized specimen got superior corrosion resistance in the condition of 47 mass% boiling sulfuric acid. It was confirmed that the pre-oxidation was effective in improving corrosion resistance of the specimen.