ひずみ電極による高温高圧水溶液中の鉄電極のアノード反応の解析

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タイトル別名
  • Analysis of Anodic Behavior of Iron Electrode in High Temperature and High Pressure Aqueous Solution by Straining Electrode
  • ヒズミ デンキョク ニ ヨル コウオン コウアツ スイヨウエキチュウ ノ テツ

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説明

A rapid straining electrode technique has been applied to investigate the initial process of anodic reaction on a newly created surface of pure iron in high temperature and high pressure aqueous solutions at constant potentials at temperatures up to 573K. In sodium sulphate solution, magnetite layer formation is observed in the passive potential region, the rate for the growth being controlled by the paraboilc law. The rate constant for the growth shows a negative temperature dependence. Increase in the total amount of strain results in decrease in the initial current density, i0, and also decrease in the repassivation rate. In borate buffer solution, a stable film formation occurs. The effct of strain on dissolution and film formation is successfully explained by assuming that slip steps formed by straining act as dissolution sites and also as nucleation sites for the film formation.

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