Experimental and Computational Investigation for (E)-2-hydroxy-5-(2- benzylidene) Aminobenzoic Acid Schiff Base as a Corrosion Inhibitor for Copper in Acidic Media
Abstract
The corrosion behavior of copper in 1 M HCl in the absence and presence of Hha ((E)-2-hydroxy-5-(2-benzylidene)
aminobenzoic acid) has been investigated experimentally and computationally. In this way, the electrochemical behavior of
copper was studied in 1 M HCl and 1 M HCl ? x M Hha solutions under different temperatures. Electrochemical techniques
were used. In addition to the laboratory methods, computational chemistry was also used to confirm the corrosion
protection ability of the inhibitor. In this way, relationship between Hha and copper ions was investigated by computational
chemistry methods via B3LYP/6-31G(d) level in detail. The optimum concentration of the studied inhibitors showing the
best corrosion inhibition at different temperatures. The inhibition efficiency increases with increase in concentration of
Hha. Scanning electron microscopy observations of the copper surface confirmed the existence of an adsorbed film.
Quantum calculations also were showed a good tendency for this inhibitor to metal ions. This study demonstrates that the
application of Hha will significantly reduce the corrosion rate of copper.