Abstract
The effect of two amino-acid compounds, dl-alanine and dl-cysteine, on copper corrosion in an aerated 0.5 mol l−1 HCl solution was studied by weight-loss measurements, potentiodynamic polarisation curves, and electrochemical impedance spectroscopy. A conventional benzotriazole (BTA) inhibitor was also tested for comparison. dl-cysteine was shown to be the most effective inhibitor among those tested inhibitors. Potentiodynamic polarisation results revealed that both the dl-alanine and dl-cysteine acted as an anodic inhibitor; however, dl-cysteine, in particular, was more effective, as it strongly suppressed anodic current densities. The improved inhibition efficiency of dl-cysteine in the 0.5 mol l−1 HCl solution was due to its adsorption on the copper surface via the mercapto group in its molecular structure.
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The authors express their appreciation for support from the Shanghai Leading Discipline Project (P1304), P. R. China.
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Zhang, Dq., Gao, Lx. & Zhou, Gd. Inhibition of copper corrosion in aerated hydrochloric acid solution by amino-acid compounds. J Appl Electrochem 35, 1081–1085 (2005). https://doi.org/10.1007/s10800-005-9009-7
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DOI: https://doi.org/10.1007/s10800-005-9009-7