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首页> 外文期刊>Russian journal of electrochemistry >Anode oxidation of copper in alkali media in the presence of glycine, α-alanine, and asparagine acid
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Anode oxidation of copper in alkali media in the presence of glycine, α-alanine, and asparagine acid

机译：甘氨酸，α-丙氨酸和天冬酰胺酸存在下在碱性介质中铜的阳极氧化

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摘要

The effect of glycine, α-alanine, and asparagine acid on the kinetics of anode processes occurring for copper in alkali electrolytes is studied. The experiments are performed in a background solution of 1 × 10 ~(-2) M NaOH (pH 12). The concentrations of glycine and α-alanine are varied in the range of 1 × 10 ~(-6)-1 × 10 ~(-1) M, and the concentration of asparagine acid is varied in the range of 1 × 10 ~(-5)-1 × 10 ~(-3) M. All amino acids used in this work have been found to stimulate anode oxidation of passivated copper, initiating local activation (LA) of the metal. Depending on the nature of amino acids, this effect occurs in various concentration ranges: for glycine and α-alanine, it takes place at c= 5 × 10 ~(-3)-2 × 10 ~(-2) M, while for asparagine acid, at c = 1 × 10 ~(-5)-1 × 10 ~(-3) M. In addition to this general regularity, several individual peculiarities have been revealed: in the systems containing a monobasic amino acid additive, local activation occurs at E = 0.10-0.20 V, while in the presence of a dibasic amino acid, the local activation is observed at two potentials, E _(LA) ~1 = 0.20-0.30 V and = E _(LA) ~2 = 0.80-0.90 V, separated by the repassivation region.
机译：研究了甘氨酸，α-丙氨酸和天冬酰胺酸对碱性电解液中铜发生阳极过程动力学的影响。实验在1×10〜（-2）M NaOH（pH 12）的背景溶液中进行。甘氨酸和α-丙氨酸的浓度在1×10〜（-6）-1×10〜（-1）M的范围内变化，天冬酰胺酸的浓度在1×10〜（范围）的范围内变化-5）-1×10〜（-3）M。已发现用于这项工作的所有氨基酸均能刺激钝化铜的阳极氧化，从而引发金属的局部活化（LA）。根据氨基酸的性质，这种作用会在不同的浓度范围内发生：对于甘氨酸和α-丙氨酸，它会在c = 5×10〜（-3）-2×10〜（-2）M时发生，而对于天冬酰胺酸，c = 1×10〜（-5）-1×10〜（-3）M。除此一般规律外，还发现了几个单独的特性：在含有一元氨基酸添加剂的系统中，局部激活发生在E = 0.10-0.20 V，而在二元氨基酸存在的情况下，在两个电势E _（LA）〜1 = 0.20-0.30 V和= E _（LA）〜2处观察到了局部激活。 = 0.80-0.90 V，由重新钝化区域分隔。

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