Inhibition Effect of AC-Treated, Mixed Self-Assembled Film of Phenylthiourea and 1-Dodecanethiol on Copper Corrosion

Abstract

A new method for preparing effective inhibition film on copper has been developed. Phenylthiourea was first adsorbed to a copper surface to form a self-assembled film. 1-Dodecanethiol was then self-assembled on the surface for subsequent modification. Finally, ac voltage was loaded on copper covered with the mixed film to further modify the film. After these procedures, an effective inhibition film was obtained as indicated by the low corrosion current density in polarization curves. High charge-transfer resistance in electrochemical impedance spectra reveals that the film hinders corrosion electrochemical reaction between the copper surface and NaCl solution. Film coverage on the copper surface is more than 99.0%, and inhibition efficiency is more than 97.2% in 0.5 mol dm Ϫ3 NaCl solutions. The mixed films before and after ac treatment are stable in a wide region of potentials. X-ray photoelectron spectroscopy analysis reveals that the effect of ac treatment may associate with the formation of a new complex compound.

Electrochemical adsorption studies of urea on copper surface in alkaline medium

“…Organic compounds containing polar group including nitrogen, sulphur, and oxygen [3][4][5][6][7][8][9] have been reported to inhibit copper corrosion. The inhibitions of these organic compounds are usually attributed to their interactions with the copper surface via adsorption.…”

The Role of Corrosion Inhibitors in Protecting Metallic Structures against Corrosion in Harsh Environments

“…Organic compounds containing polar groups including nitrogen, sulfur, and oxygen (Gomma and Wahdan 1994, Zucchi, Trabanelli and Fonsati 1996, Kendig and Jeanjaquet 2002, Ma et al 2004, Christy et al 2004, Zhang, Gao, and Zhou 2004, Otmacic et al 2004, and Wang, Chen and Zhao 2004 and heterocyclic compounds with polar functional groups and conjugated double bonds (Al-Kharafi, 1988, Elmorsi and Hassanein 1999, Otmacic and Stupnisek-Lisac 2002, Dafali et al 2002, Scendo, Poddebniak and Malyszko 2003, Sherif 2011, and Sherif 2013 have been reported to be good corrosion inhibitors. The inhibiting action of these organic compounds is usually attributed to their interactions with the metal surface via their adsorption.…”

Theoretical Evaluation of Corrosion Inhibition Performance of Some Benzenthiol Derivatives for Copper in Acid Media

“…Inhibitors are chemicals that often work by adsorbing themselves on the metallic surface by forming a film (Noor, 2008;Ebenso et al, 2008;Oguzie, 2006). Organic compounds containing polar groups including nitrogen, sulfur, and oxygen (Otmacic et al, 2004;Ma et al, 2002;Wang et al, 2004;Kendig and Jeanjaquet, 2002;Ma et al, 2003), and heterocyclic compounds with polar functional groups and conjugated double bonds (Elmorsi and Hassanein, 1999;Al-Kharafi, 1988;Scendo et al, 2003) have been reported to inhibit copper corrosion. The inhibiting action of these organic compounds is usually attributed to their interactions with the copper surface via their adsorption.…”