著者

尾形 幹夫

出版者

一般社団法人 表面技術協会

雑誌

金属表面技術 (ISSN:00260614)

巻号頁・発行日

vol.26, no.12, pp.592-596, 1975-12-01 (Released:2009-10-30)

参考文献数

5

被引用文献数

1

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Experiments were carried out to find the mechanism of galvanic displacement: Fe+Cu2+→Fe2++Cu. When iron is immersed in a concentrated copper sulfate solution, e.g., 0.5M, a poorly adherent copper is deposited. In this case FeSO4 or Fe2O3 coprecipitated with the copper because the concentration of Fe2+ near the interface increased rapidly immediately after the immersion. However, atyell adherent copper was deposited by immersion in an acidic dilute copper sulfate solution, e.g., 0.01M, pH 1.5. In this case the rate of copper deposition, namely, the rate of formation of Fe2+ was slow, so that the Fe2+ was permitted to diffuse into the bulk of the solution without precipitating, which was the case of well adherent copper plate. The formulation of immersion plating of copper on iron was: CuSO4 0.0025-0.03M, pH<2.5, room temperature, immersion time 0.5-15min. The copper plating applied under these conditions was adherent to iron, hence copper could be electroplated on it from the ordinary pyrophosphate baths.

著者

尾形 幹夫

出版者

一般社団法人 表面技術協会

雑誌

実務表面技術 (ISSN:03682358)

巻号頁・発行日

vol.21, no.11, pp.576-580, 1974-11-01 (Released:2009-10-30)

著者

尾形 幹夫

出版者

一般社団法人 表面技術協会

雑誌

表面技術 (ISSN:09151869)

巻号頁・発行日

vol.69, no.4, pp.163-165, 2018-04-01 (Released:2018-12-01)

参考文献数

15

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Hydrogen・oxygen nanobubbles were generated in 0.1-1.0 m mol/L Na2SO4 solutions using anomalous high-frequency AC electrolysis (-pole and ±poles, 30 kHz). The bubble size distribution was 20-600 nm. The maximum bubble number density was about 4 million per milliliter at the size distribution position of 100 nm. The bubble number density of the solution boiled for 2 min did not decrease, but instead increased slightly. After 26 days, the nanobubbles were found to exist almost stably.