The behavior of copper in the presence of cysteine in the concentration range 10 M - 10 M ina 0.5 M Na2SO4 solution (pH 7 and pH 9) is studied using potentiodynamic polarization andchronoamperometry. Potentiodynamic polarization shows that cysteine acts as a copper corrosioninhibitor both in alkaline and neutral sulphate solutions. The inhibitory action occurs through Cu(I)ads,which participates in the formation of the Cu(I)-cys film on the metal surface. At higher anodicpotentials Cu(II)ads occurs, which is unfavourable for the adsorption of cysteine. The efficiency ofcorrosion inhibition increases as cysteine concentration increases. Chronoamperometry results are inaccordance with the results of potentiodynamic polarization. The adsorption of cysteine proceedsaccording to the Langmuir adsorption isotherm.
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机译：使用电位动力学极化法和计时电流法研究了在0.5 M Na2SO4溶液（pH 7和pH 9）中浓度为10 M-10 M的半胱氨酸存在下铜的行为。电位动力学极化表明，半胱氨酸在碱性和中性硫酸盐溶液中均作为铜腐蚀抑制剂。抑制作用通过Cu（I）ads发生，Cu（I）ads参与金属表面上Cu（I）-cys膜的形成。在较高的阳极电势下，会出现Cu（II）ads，不利于半胱氨酸的吸附。随着半胱氨酸浓度的增加，腐蚀抑制的效率也随之增加。计时电流法的结果与电位动力学极化的结果不一致。半胱氨酸的吸附根据Langmuir吸附等温线进行。
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