Experimental investigation and modeling of the performance of pure and mixed surfactant inhibitors: Micellization and corrosion inhibition

摘要

Surfactants have been widely used as inhibitors for metal corrosion inhibition by their adsorption on metal surface to act as a protective film. The adsorption, however, is highly affected by surfactant micellization which needs a systemic study. An improved critical micelle concentration (cmc) prediction model is developed and validated to study micellization of various pure and mixed surfactants in aqueous solution containing salts (0-3 M). The effects of counterion and coion specificity on aggregation properties are successfully evaluated. The predicted aggregation properties, including critical micelle concentration (cmc), micelle shape, micelle aggregation number, and sphere-to-rod transition, agree well with experimental data. The cmc model, in combination with improved adsorption evaluation approach, the modified Langmuir adsorption and the modified quantitative structure activity relation, provides a method to evaluate the effects of micellization on surfactant adsorption and associated corrosion inhibition performance. (C) 2015 Elsevier B.V. All rights reserved.