Inhibition of acidic corrosion of aluminium using ethoxylated fatty amide

摘要

THE INHIB1TIVE action of some compounds of ethoxylated fatty amide with different numbers of ethylene oxide units towards the corrosion of aluminium in 2M HCI was studied using weight-loss, hydrogen-evolution, and galvanostatic-polarization measurements. The inhibition efficiency increased with increasing concentration and the number of ethylene oxide units. The inhibitive effect of these compounds was explained in terms of adsorption on the metal surface through ethoxy groups, while the hydrocarbon parts protrude, brush-like, into the solution. The adsorption process follows the langmuir adsorption isotherm.