Corrosion inhibition of aluminum alloy 7613 by dimethylethanolamin in (0.6 m)‎ NaCl solution

Abstract EN

The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613 Aluminum 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 of temperature effect (25, 35, 45)0 C on the inhibitor efficiency .The results indicated that the inhibition occurs by absorption of inhibitor molecules on the metal surface.

The inhibition efficiency (I %) was found to increase with increasing inhibitor concentration and decreasing with increasing temperature.

For inhibitor concentration close to (8 *10-3 M) maximum inhibition efficiency obtained was 92 % .

Above this inhibitor concentration value in the solution the inhibitor efficiency decreases.

Polarization measurements showed that the DMEA act as a mixed type inhibitor.

The corrosion potential (Ecorr.) values shifted to less negative values by increasing the concentration of DMEA in the solution up to (8 * 10-3 M).

Adsorption of DMEA on the surface of Aluminum is found to obey the Langmuir isotherm.