Nonlinear Group-Contribution Models of Corrosion Inhibition

Abstract

The correlation between the molecular structure and inhibitor efficiency (Ei) of triamines was investigated. The group-contribution approach was adapted to account for Langmuir- and Frumkin-type inhibition. The group contributions (aj) were obtained using a nonlinear regression technique. It was assumed that corrosion inhibition was proportional with coverage, which in turn was accounted for by the Langmuir and Frumkin models of adsorption. The multiple correlation coefficient obtained by the linear group-contribution model was improved markedly by using adsorption models. On the basis of these results, a more efficient inhibitor molecule was proposed.