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Journal Articles

Study of container using hybrid technique for sulfuric acid decomposition of thermochemical water-splitting iodine-sulfur process

Ioka, Ikuo; Iwatsuki, Jin; Kuriki, Yoshiro*; Kawai, Daisuke*; Yokota, Hiroki*; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki

Mechanical Engineering Journal (Internet), 7(3), p.19-00377_1 - 19-00377_11, 2020/06

A thermochemical water-splitting iodine-sulfur processes (IS process) is one of candidates for the large-scale production of hydrogen with high cost performance. Severe corrosive environment which is 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. This was attributed to the formation of SiO$$_2$$ on the surface. To confirm the production characteristics of a container using the hybrid material, the container which has a welded part, a chamfer, a curved surface was experimentally made. There was no detachment in the plasma spraying and laser treated layer of the container after the laser treatment. It was confirmed that the construction of the container with high corrosion resistance in sulfuric acid was possible in the hybrid technique.

Journal Articles

Development of container using plasma sprayed and laser treated material for sulfuric acid decomposition of thermochemical water-splitting iodine-sulfur process

Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki

Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 5 Pages, 2019/05

A thermochemical water-splitting iodine-sulfur processes (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. 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. This was attributed to the formation of SiO$$_{2}$$ on the surface. To confirm the production characteristics of a container using the hybrid material, the container which has a welded part, a chamfer, a curved surface was experimentally made. There was no detachment in the plasma spraying and laser treated layer of the container after the laser treatment.

Journal Articles

Corrosion tests of iron-silicon alloys in boiling sulfuric acid

Ioka, Ikuo; Onuki, Kaoru; Futakawa, Masatoshi; Kuriki, Yoshiro*; Nagoshi, Masayasu*; Nakajima, Hayato; Shimizu, Saburo

Ryusan To Kogyo, 52(4), p.1 - 6, 1999/04

no abstracts in English

Journal Articles

Corrosion resistance and nature of surface film on Fe-Si alloy in boiling sulfuric acid

Ioka, Ikuo; *; ; Futakawa, Masatoshi; Onuki, Kaoru

Nippon Kinzoku Gakkai-Shi, 63(5), p.609 - 612, 1999/00

no abstracts in English

Oral presentation

Evaluation of Fe-high Si alloy lining tube by centrifugal casting

Ioka, Ikuo; Kuriki, Yoshiro*

no journal, , 

The thermochemical water-splitting (IS process) for hydrogen production has been developed by JAEA as application of a high-temperature gas cooled reactor. The IS process includes a severe corrosion environment which is made to boil and decompose concentrated sulfuric acid. Two kinds of brittleness materials, SiC and Fe-high Si alloy, are reported as materials having enough corrosion resistance in this corrosion environment. The two-layer pipe consisted of the Fe-high Si alloy with boiling sulfuric acid-resistant and the carbon steel with the ductility was produced by centrifugal casting. The evaluation of characteristics was carried out. The Fe-high Si alloy lining showed enough corrosion resistance in boiling sulfuric acid. As evaluation of the Fe / Fe-high Si alloy interface, thermal cycle test (100$$^{circ}$$C-900$$^{circ}$$C) was executed. There was not the interface detachment and it was confirmed to have enough interfacial strength.

Oral presentation

Development of hybrid material using plasma spraying and laser treatment for thermochemical water-splitting iodine-sulfur process

Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki

no journal, , 

IS process is composed of the Bunsen reaction, thermal decomposition of hydrogen iodide and thermal decomposition of sulfuric acid. By carrying out three reactions sequentially, water can be decomposed into hydrogen and oxygen. Evaluation of materials for the sulfuric acid decomposition has revealed that high silicon alloys have excellent corrosion resistance. The material is brittle, so it's difficult to use them independently as structural materials. So, we have developed a hybrid material with the corrosion-resistant and the ductility. In this work, the hybrid material was made by the plasma spraying and laser treatment. Corrosion tests on the hybrid material were carried out. The evaluation that paid attention to cracks of the surface layer was performed using OM and SEM/EDX. The surface of the hybrid material showed corrosion resistance in boiling 47% sulfuric acid though some cracks were observed in the surface layer from the cross section observation.

Oral presentation

Effect of post heat treatment on corrosion resistance of surface modified material for thermochemical water-splitting process

Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki

no journal, , 

A hybrid material with high corrosion resistance for boiling sulfuric acid has been developed for IS process. To improve the corrosion resistance of the hybrid material, the specimen was treated with a post heat treatment. The specimen got superior corrosion resistance in the condition of boiling sulfuric acid.

Oral presentation

Improvement of corrosion resistance of plasma sprayed and laser treated material for boiling sulfuric acid process by pre-oxidation

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. Severe corrosive environment which is 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% boiling sulfuric acid. On the other hand, the corrosion rate of the specimen in 47% boiling sulfuric acid was fifty times higher than that in 95% boiling sulfuric acid. It seems that the cracks of the surface layer weren't sealed up perfectly in the condition of 47% boiling sulfuric acid. To improve the corrosion resistance of the specimen in 47% boiling sulfuric acid, the specimen was treated with a thermal treatment for pre-oxidation. The pre-oxidized specimen got superior corrosion resistance in the condition of 47% boiling sulfuric acid. It was confirmed that the pre-oxidation was effective in improving corrosion resistance of the specimen.

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