Corrosion inhibition and adsorption behavior of 2-((dehydroabietylamine) methyl)-6-methoxyphenol on mild steel surface in seawater

The inhibition effect of a Dehydroabietylamine Schiff base derivative, namely 2-((dehydroabietylamine) methyl)-6-methoxyphenol (DMP) against mild steel corrosion in seawater was evaluated using weight loss and electrochemical techniques (potentiodynamic polarization and electrochemical impedance). The experimental results showed that DMP is a good corrosion inhibitor and the inhibition efficiency increased with the increase of DMP concentration, while the adsorption followed the Langmuir isotherm. X-ray photoelectron spectroscopy, scanning electron microscopy, theoretical calculation of electronic density, molecular electrostatic potential and molecular dynamics were carried out to establish mechanism of corrosion inhibition for mild steel with DMP in seawater medium. The inhibition action of the compound was assumed to occur via adsorption on the steel surface through the active centers in the molecule. The corrosion inhibition is due to the formation of a chemisorbed film on the steel surface. (C) 2011 Elsevier B.V. All rights reserved.