書誌事項
- タイトル別名
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- Thermodynamic Consideration of Corrosion in a Gas Composed of Iodine, Oxygen, Hydrogen, Hydrogen Iodide and Water Vapor using Gurry Diagram
- Study on Construction Materials for the Magnesium-Iodine Cycle of Thermochemical Hydrogen Production Process (Part 6)
説明
In order to presume whether the metal iodides are formed in the corrosive environments of the Magnesium-Iodine cycle proposed to make hydrogen by thermochemical process, thermodynamic treatment of the gas-metal system was conducted. Phase stability diagram of metals, drawn from the standard free energy of formation of the substances involved in the corrosion reactions, gives the key to thermodynamic approach, but the equilibrium pressures of iodine and oxygen should be known beforehand. In order to save the cumbersome work to solve a set of non-linear equations for equilibrium calculation in each case, the idea of graphical representation of equilibrium pressures devised by Gurry was introduced. Assuming that the molecules present in gas mixture are H2, I2, HI, O2 and H2O, a set of equations, which represent equilibrium relationships under the total pressure equal to 1atm, was solved numerically by the method of “regula falsi”. Gurry diagram with the parameters of PO<sub>2</sub>, PI<sub>2</sub>, (P2I<sub>2</sub>/PO<sub>2</sub>), and (PI<sub>2</sub>/PO<sub>2</sub>) were drawn. By referring to the phase stability diagrams, stable regions of iodides and oxides of several metals were determined. As for Ti, Zr, and Ta, oxides are stable in the environments corresponding to Mg-I cycle. With regard to Fe, Ni, and Cr, oxides are not always stable in the environment of high hydrogen content.
収録刊行物
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- CORROSION ENGINEERING
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CORROSION ENGINEERING 32 (3), 137-143, 1983
社団法人 腐食防食協会
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詳細情報 詳細情報について
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- CRID
- 1390001206257635968
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- NII論文ID
- 130006024734
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- ISSN
- 18841155
- 00109355
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
