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Protective effect of L-cysteine and cationic surfactant on brass in hydrochloric acid solution

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Document pages: 12 pages

Abstract: In addition to SEM-EDS analysis, the electrochemical behavior of brass in hydrochloric acid solution and the inhibition of L-cysteine were studied by electrochemical technology. The results show that the immersion time of copper electrode in inhibitor solution is related to the concentration of inhibitor. The electrochemical test results show that copper (I) - cysteine complex is formed on the surface of brass in chloride solution with different amount of cysteine. The formed complex plays an important role in inhibiting the corrosion process in the examined medium because Cu (I) - cysteine significantly reduces the dissolution of brass. After pretreatment in sodium dodecyl sulfate (SDS), the curve was obtained by cyclic measurement and potentiodynamic polarization in an acidic solution in the presence of cysteineization measurements indicate intense inhibition of corrosion processes. Efficient inhibition of brass dissolution is result of formation of a stable protective layer on the brass surface after pretreatment of the electrode in SDS solution. The brass surface is modified in sodium dodecyl sulfate solution in order to increase cysteine adsorption on the electrode surface and to improve inhibition efficiency. Inhibition mechanism of cysteine includes adsorption on active sites on the electrode surface, which is confirmed by SEM-EDS analysis of brass. Adsorption of cysteine in hydrochloric acid solution obeys the Langmuir adsorption isotherm. Also, Gibbs free energy of adsorption has a value of −31.5 kJ mol and indicates strong adsorption of cysteine on the electrode surface.

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