1994 Volume 43 Issue 8 Pages 428-432
Corrosion weight loss tests have been carried out of the Al (110) plane in the 3N HCl solutions added each of CH2=CHCOOH, HCOOH, and MeCOOH at 50°C, 60°C, and 70°C. The adsorption energies ΔH (kJ/mol) of each of the three carboxylic acids were obtained by the correlation between log K and 1/T. The ΔH values obtained are 137.86 (CH2 CHCOOH)>66.98 (HCOOH)>27.74 (MeCOOH) and these velues have a linear correlation with the values of Δico of the acids. The Δico values have a close correlation with the corrosion inhibition of the carboxylic acids due to the adsorption of the acids on the Al single planes. The order of corrosion inhibition obtained by the polarization curves for the acids is CH2=CHCOOH>HCOOH>MeCOOH and the ΔH values obtained for the three carboxylic acids support the close correlation between adsorption and corrosion inhibition of the carboxylic acids on the Al (110) plane.