鉄による銅セメンテーション反応の機構に関する実験的研究

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タイトル別名
  • Experimental Studies of the Copper Cementation on Iron
  • テツ ニヨル ドウ セメンテーション ハンノウ ノ キコウ ニ カンスル ジッ

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The dependence of the apparent rate constant on the initial concentration of cupric ions and the effect of the peeling-off of cemented copper on the rate constant have been studied experimentally. Rate curves were measured by means of a specific cupric ion electrode referred to a saturated calomel electrode. Also, the diffusion flux of cupric ions was analyzed as functions of reaction time and cupric ion concentration.<BR>The rate curve for copper cementation consists of three portions : an initial linear stage, a final linear stage, and a transitional portion between these two stages. The amount of cemented copper, whose protrusion can decrease the diffusion path length of cupric ions, was found to be independent of the initial concentration of cupric ions. The diffusion flux, which is closely related to the initial cupric ion concentration, decreases exponentially at the initial stage of the reaction and then increases abruptly at the starting point of the transition stage, followed by the initiation of peeling-off of the cemented copper. Further, the lapse of time cause the decrease of the flux.<BR>The rate constant should be independent of the initial concentration of the cupric ion. Nevertheless, the final rate constants appeared to depend on the initial cupric ion concentration, whereas no such a dependence was observed for the initial stage. On the other hand, the amount of peeled-off copper exhibits a similar tendency to the final rate constants. The effect of initial concentration on the final rate constant might be attributed to the hydrodynamic turbulence in a boundary layer.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 43 (6), 499-505, 1979

    公益社団法人 日本金属学会

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