El-Sayed M. Sherif, Su-Moon Park
Dec 1, 2006
Citations
5
Influential Citations
260
Citations
Quality indicators
Journal
Corrosion Science
Abstract
Amino-5-ethyl-1,3,4-thiadiazole (AETDA) has been evaluated as a corrosion inhibitor for cop- per in 3.0% NaCl solutions using weight loss, pH, potentiodynamic polarization, potentiostatic cur- rent-time, and electrochemical impedance spectroscopic (EIS) measurements. The study was also complemented by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) investi- gations. Weight loss measurements gave an inhibition efficiency of about 60% with 1.0 · 10 � 3 M AETDA present, increasing to about 97% at the AETDA concentration of 5.0 · 10 � 3 M. Potentio- dynamic polarization measurements showed that the presence of AETDA in de-aerated, aerated and oxygenated 3.0% NaCl solutions decreases cathodic, anodic, and corrosion currents to a great extent and shifts the corrosion potential slightly towards more negative values. Potentiostatic current-time measurements, SEM and EDX investigations also confirmed that the protection of the copper sur- face is achieved by strong adsorption of AETDA molecules. EIS measurements revealed that the sur- face and the charge transfer resistances increase upon increasing the AETDA concentration. Results together showed clearly that AETDA is a good mixed-type inhibitor for copper corrosion and its inhibition efficiency increases in the order of oxygenated > aerated > de-aerated 3.0% NaCl solutions.