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Free Content Corrosion Inhibition Effect of Self-Assembled Monolayers of Ammonium Pyrrolidine Dithiocarbamate on Copper

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Ammonium pyrrolidine dithiocarbamate (APDTC) is an environmentally friendly corrosion inhibitor. The anticorrosion mechanism and adsorption behavior for the self-assembled monolayers (SAMs) of APDTC on the surface of copper in 0.5 mol·L-1 HCl solution were investigated by electrochemical methods. Results indicated that APDTC was liable to interact with copper forming SAMs on the surface of copper. APDTC SAMs changed the structure of the double electric layer and restrained both the processes of anodic oxidation and cathodic reduction. Electrochemical impedance spectroscopy (EIS) measurement results indicated that the charge transfer resistance of the copper electrode with APDTC SAMs increased greatly and its double electric layer capacitance decreased significantly. This is in good agreement with the fact that APDTC SAMs have a high inhibition effect on copper in 0.5 mol·L-1 HCl solution measured by EIS and by polarization curves. Adsorption of APDTC SAMs was found to follow Langmuir's adsorption isotherm and the mechanism consisted of a mixed adsorption between chemisorption and physisorption.

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Keywords: APDTC; Adsorption; Anticorrosion; Copper; Self-assembled monolayers

Document Type: Research Article

Publication date: 15 August 2009

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  • Acta Physico-Chimica Sinica, founded in 1985, is sponsored by the Chinese Chemical Society and organized by the College of Chemistry and Molecular Engineering, PekingUniversity. Since 1997, Acta Physico-Chimica Sinica has been indexed in SCI of ISI (US). Acta Physico-Chimica Sinica is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and material physical chemists. Manuscripts that are essentially reporting data, applications of data, or reviews of the literature are not suitable for publication in Acta Physico-Chimica Sinica.
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