지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Methods of producing hydrogen include steam reforming, electrochemical decomposition of water, and the SI process. Among these methods, the Sulfur iodine process is one of the most promising processes for hydrogen production. The thermochemical sulfur-iodine (SI) process uses heat from a high-temperature-gas nuclear reactor to produce $H_2$ gas; this process is known for its production of clean energy as it does not emit $CO_2$ from water. But the SI-process takes place in an extremely corrosive environment for the materials. To endure SI environments, the materials for the SI environment will have to have strong corrosion resistance. This work studies the corrosion resistances of the Fe-Si, Ni-Ti and Ni Alloys, which are tested in SI-process environments. Among the SI-process environments, the conditions of boiling sulfuric acid and decomposed sulfuric acid are selected in this study. Before testing in boiling sulfuric acid environments, the specimens of Fe-4.5Si, Fe-6Si, Ni-4.5Si, Ni-Ti-Si-Nb and Ni-Ti-Si-Nb-B are previously given heat treatment at $1000^{\circ}C$ for 48 hrs. The reason for this heat treatment is that those specimens have a passive film on the surface. The specimens are immersed for 3~14 days in 98wt% boiling sulfuric acid. Corrosion rates are measured by using the weight change after immersion. The corrosion rates of the Fe-6Si and Ni-Ti-Si-Nb-B are found to decrease as the time passes. The corrosion rates of Fe-6si and Ni-Ti-Si-Nb-B are measured at 0.056 mm/yr and 0.16 mm/yr, respectively. Hastelloy-X, Alloy 617, Alloy 800H and Haynes 230 are tested in the decomposed sulfuric acid for one day. Alloy 800H was found to show the best corrosion resistance among the materials. The corrosion rate of Alloy 800H is measured at -0.35 mm/yr. In these results, the corrosion resistance of materials depends on the stability of the oxide film formed on the surface. After testing in boiling sulfuric acid and in decomposed sulfuric acid environments, the surfaces and compositions of specimens are analyzed by SEM and EDX.
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참고문헌 (7)
참고문헌 신청
Hiroyuki Ota / 2005 / in Proceedings of the 13th International Conference on Nuclear Engineering :1
JONGHWA CHANG / 2007 / A STUDY OF A NUCLEAR HYDROGEN PRODUCTION DEMONSTRATION PLANT / Nuclear Engineering and Technology 39(2):111~122
D. J. Kim / 2006 / in Proceedings of the 14th Asia-Pacific Corrosion Control Congress :10
D. J. Kim / 2007 / Integrity Assessment of Sulfuric Acid Container Materials for Hydrogen Production Using VHTR as a GEN IV / Korean Socity of Pressure Vessels and Piping, Daejon :29~36
D. J. Kim / 2007 / Corrosion of selected materials in boiling sulfuric acid for the nuclear power industries / Corrosion Science and Technology :37~43
JONGHWA CHANG / 2007 / A STUDY OF A NUCLEAR HYDROGEN PRODUCTION DEMONSTRATION PLANT / Nuclear Engineering and Technology 39(2):111~122
D. J. Kim / 2006 / in Proceedings of the 14th Asia-Pacific Corrosion Control Congress :10
D. J. Kim / 2007 / Integrity Assessment of Sulfuric Acid Container Materials for Hydrogen Production Using VHTR as a GEN IV / Korean Socity of Pressure Vessels and Piping, Daejon :29~36
D. J. Kim / 2007 / Corrosion of selected materials in boiling sulfuric acid for the nuclear power industries / Corrosion Science and Technology :37~43
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