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Study on the effect of temperature and pressure on nickel-electroplating characteristics in supercritical CO2

机译：温度和压力对超临界CO2中镍电镀特性的影响研究

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In this work, it was investigated the effect of solubility in supercritical CO2 on the nickel-electroplating characteristics. The plating characteristics could be controlled by electric resistance and dispersion in emulsion as well. CO2 concentration had better be controlled at lower concentration than 50 CO2 wt% to decrease electric resistance since supercritical CO2 is non-polar material. Non-ionic surfactant with EO/PO block copolymer was more efficient than any other surfactant and the dispersion at 0.2 surfactant wt% was better than at any surfactant concentration and over-added surfactant concentration over 0.2 wt% brought to the decrease of dispersion properties. Electric resistance was constant at 20Omega in ranging from pH 2.2 to pH 3.5 and increased slowly to 50Omega at pH 4 and rapidly to 400Omega at pH 5. Characteristics of nickel film has a close relation with solubility in supercritical CO2 and solubility is dependent on pressure and temperature. Solubility at 16 MPa was higher than that any other at pressure and at constant pressure of 16 MPa, solubility in supercritical CO2 increased with an increasing temperature from 31 to 45degreesC and decreased over 45degreesC. (C) 2004 Elsevier Ltd. All rights reserved.
机译：在这项工作中，研究了在超临界CO2中的溶解度对镍电镀特性的影响。电镀特性也可以通过电阻和在乳液中的分散来控制。由于超临界CO2是非极性材料，最好将CO2浓度控制在低于50 CO2 wt％的浓度以降低电阻。具有EO / PO嵌段共聚物的非离子表面活性剂比任何其他表面活性剂更有效，在0.2表面活性剂重量％处的分散性要好于任何表面活性剂浓度，超过0.2 wt％的过量添加的表面活性剂浓度导致分散性能下降。电阻在pH 2.2至3.5的范围内恒定为20Ω，在pH 4时缓慢增加至50Ω，在pH 5时迅速增加至400Ω。镍膜的特性与在超临界CO2中的溶解度密切相关，溶解度取决于压力和压力。温度。在16 MPa的压力下，在压力和恒定压力为16 MPa时的溶解度高于其他任何条件，在超临界CO2中的溶解度随着温度从31升高到45摄氏度而增加，并在超过45摄氏度时降低。 （C）2004 Elsevier Ltd.保留所有权利。

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