Corrosion Inhibition of Aluminum Alloy 7613 by Dimethylethanolamin in (0.6 M) NaCl Solution

Abstract

The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613Aluminum alloy in 0.6 M NaCl solution have been investigated using weight loss,polarization techniques .Five different concentrations (2*10-3, 4*10-3, 6*10-3 ,8*10-3 and 10*10-3) M of (DMEA) were studded at 250 C. Also examine oftemperature effect (25, 35, 45)0 C on the inhibitor efficiency .The results indicatedthat the inhibition occurs by absorption of inhibitor molecules on the metal surface.The inhibition efficiency (I %) was found to increase with increasing inhibitorconcentration and decreasing with increasing temperature. For inhibitorconcentration close to (8*10-3 M) maximum inhibition efficiency obtained was 92%. Above this inhibitor concentration value in the solution the inhibitor efficiencydecreases.Polarization measurements showed that the DMEA act as a mixed type inhibitor.The corrosion potential (Ecorr.) values shifted to less negative values by increasingthe concentration of DMEA in the solution up to (8*10-3 M). Adsorption of DMEAon the surface of Aluminum is found to obey the Langmuir isotherm