Technical Faculty Bor, University of Belgrade, VJ 12, P.O. Box 50, 19210, Bor, Serbia.
Environ Sci Pollut Res Int. 2013 Jul;20(7):4370-81. doi: 10.1007/s11356-012-1088-5. Epub 2012 Jul 27.
The aim of this study was to investigate electrochemical properties of brass in neutral and weakly alkaline solutions in the presence of cysteine as a nontoxic and ecological corrosion inhibitor. Potentiodynamic measurements, open circuit potential measurements, as well as chronoamperometric measurements were the methods used during investigation of the inhibitory effect of cysteine on the corrosion behaviour of brass. Potentiodynamic measurements showed that cysteine behaves as a mixed-type inhibitor in the investigated media. Based on polarization curves for brass in a weakly alkaline solution of sodium sulphate at varying cysteine concentrations, an interaction occurs between Cu(+) ions and the inhibitor, resulting in the formation of a protective complex on the electrode surface. The results of chronoamperometric measurements confirm the results obtained by potentiodynamic measurements. Optical microphotography of the brass surface also confirms the formation of a protective film in the presence of a 1 × 10(-4) mol/dm(3) cysteine. Adsorption of cysteine on the brass surface proceeds according to the Langmuir adsorption isotherm.
本研究的目的是研究半胱氨酸作为一种无毒且环保的腐蚀抑制剂存在时，黄铜在中性和弱碱性溶液中的电化学性能。在研究半胱氨酸对黄铜腐蚀行为的抑制作用时，使用了动电位测量、开路电位测量和计时电流测量等方法。动电位测量表明，半胱氨酸在研究的介质中表现为混合型抑制剂。基于在不同半胱氨酸浓度下的硫酸钠弱碱性溶液中黄铜的极化曲线，Cu(+)离子与抑制剂之间发生相互作用，导致在电极表面形成保护性络合物。计时电流测量的结果证实了动电位测量的结果。黄铜表面的光学显微照片也证实了在 1×10(-4) mol/dm(3)半胱氨酸存在下形成了保护膜。半胱氨酸在黄铜表面的吸附遵循 Langmuir 吸附等温线。
