Abstract

A method for determining the Faraday current efficiency (Ce_F) based on the ratio of partial winning currents of metal and hydrogen is considered. To calculate the magnitude of Ce_F based on polarization measurements, it is necessary to know the working current density and potential (E_i), at which metal deposits in the corresponding solution, as well as the kinetic parameters of hydrogen evolution for determining the partial current density of hydrogen (\({{i}_{{{{{\text{H}}}_{{\text{2}}}}}}}\)) at this potential. Using the proposed method, the current efficiency for nickel extraction and deposition of the nickel coating from solutions containing nickel sulfate at a current density of 300 A/m² is calculated. The kinetic parameters of hydrogen evolution are determined from the polarization curve found for the supporting electrolyte solution containing magnesium sulfate in an amount of 120 g/L and boric acid in an amount of 18 g/L at pH 3.9. The equation for the calculation of the partial current density of hydrogen evolution for any potential by kinetic parameters is derived. The use of kinetic regularities allows us to calculate Ce_F of nickel in sulfate solutions of different compositions with pH 3.0 and 4.1. The calculated values of Ce_F coincide with the current efficiency determined by the gravimetric method using a copper coulometer in the limits of the statistical error. It is shown that the division of the commercial characteristic of the “total current efficiency” (Ce_Σ) into Faraday (Ce_F) and apparatus (Ce_ap) characteristics in combination with the method of partial polarization curves makes it possible to find additional information on the degree of perfection of the production process.

中文翻译：

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极化测量在电流效率计算中的应用

摘要

考虑了一种基于金属和氢的部分获胜电流的比率确定法拉第电流效率（Ce _F）的方法。要基于极化测量值计算Ce _F的大小，必须知道工作电流密度和电势（E _i），在该电流下金属沉积在相应的溶液中，以及析氢的动力学参数以确定部分偏析。在此电位下的氢的当前密度（\（{{i} _ {{{{{\ text {H}}} _ {{\ text {2}}}}}}} \））。使用建议的方法，电流密度为300 A / m时从含硫酸镍的溶液中提取镍和沉积镍涂层的电流效率²被计算。氢析出的动力学参数由极化电解质曲线确定，该极化曲线是在pH 3.9时，硫酸铜含量为120 g / L，硼酸含量为18 g / L的支持电解质溶液的极化曲线。推导了通过动力学参数计算任何势能的氢析出的部分电流密度的方程。利用动力学规律的使我们能够计算的Ce _˚F在pH 3.0和4.1的组合物不同的硫酸盐溶液的镍。Ce _F的计算值在统计误差范围内，与使用铜库仑法通过重量分析法确定的电流效率一致。结果表明，“总电流效率”（商业特性的划分的Ce _Σ）到法拉第（铈_˚F）和装置（Ce的_AP），其与局部极化曲线的方法组合特性使得有可能找到的附加信息关于生产过程的完善程度。