Electrochemical Oxidation Assessment and Interaction of 2-aminoethanol and N, N-diethylethanamine Propagation in Acidic Medium

Electro�oxidation and inhibitor performance of copper specimens in 1 M hydrochloric acid solu� tion was investigated at room temperature by linear potentiodynamic polarization and gravimetric method in the presence of 2�aminoethanol (A) and N, N�diethylethanamine (D) as an inorganic inhibitor. The effect of the inhibitory concentration on the corrosion behavior of copper was studied over 288 hrs at 298°K. The inhibitory efficiency rise up to 96% for single induced and 98% for synergistic behavior. The adsorption mechanism characteristic was supported by SEM/EDX analysis and adsorption isotherm. From all indica� tion, the inhibitive efficiency of these compounds majorly depends on their molecular structure and concen� tration. The blocking effects of the surface interface were also explained on the basis of the inhibitor active action. 2�aminoethanol and N, N�diethylethanamine inhibits copper in 1 M HCl by strictly affecting both the anodic and cathodic sites. Portion of the surface covered calculated was also found to follow Langmuir adsorption isotherm

Protective effect of electropolymerized 3-amino 1,2,4-triazole towards corrosion of copper in 0.5 M NaCl

International audienceThe electro-oxidation of 3-amino 1,2,4-triazole on a copper substrate in alkaline methanol solution produces a homogeneous and adherent polymer film. The formation kinetics of the film was investigated using cyclic voltammetry, chronoamperommetry and quartz crystal microbalance.The protection of poly-amino 1,2,4-triazole (pATA) films obtained by different electropolymerization conditions was determined by electrochemical impedance spectroscopy in 0.5 M NaCl solutions. These results were compared with those obtained with bare copper electrodes immersed in this corrosive medium. The protection of ATA reaches 99% after one month immersion test

Protective effect of electropolymerized 2-mercaptobenzimidazole upon copper corrosion

International audienceThe electrochemical oxidation of 2-mercaptobenzimidazole (MBIH) on a copper substrate in alkaline methanol solution was investigated by cyclic voltammetry, chronoamperommetry, and quartz crystal microbalance. Cyclic voltammograms indicated that the polymer film (pMBIH) is formed anodically and this film cannot be reduced by cathodic potential scan. However, one potential cycle is not sufficient to form a good barrier layer, and the anodic current peak is observed on subsequent cycles, though its height decreases for each cycle. If the film formations were performed at a constant potential, an EQCM showed the adsorption of MBIH before the anodic oxidation of this monomer leading to the film formation. The film forming efficiency was maximum at ca. 0.8 VSCE though the film thickness increased up to 1.2 VSCE. A thicker film was obtained by potential scan method. From a long period impedance measurement, it was shown that the polymer film thus obtained on copper exhibited a high protective effectiveness

Corrosion inhibition of copper in chloride solution by triazole derivatives

In this paper we examined the inhibition of copper corrosion in aerated neutral chloride solution. The inhibitors studied are azole types. The present paper is limited to the results of the anodic behavior of copper. Using current potential curves we have selected two compounds presenting the best inhibiting effect. The inhibiting action of these two species has been examined with quartz crystal microbalance (EQCM) and impedance measurements in 0.5M NaCl solution. These results were compared with those determined with bare copper electrode. In the case of blank solution it was show that copper corrosion product is forming spontaneusly and may protect against corrosion. At 0.5 mM inhibitors form an inhibiting film resulting from products adsorption on copper area. The inhibitors reduce considerably anodic current densities and lead to the copper passivation in a large anodic potential range