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Effect of Alkyl Tail Length and Concentration on Adsorption of Quaternary Ammonium Corrosion Inhibitors

Application of inhibitors is an established and cost effective method to mitigate corrosion of mild steel. Conventionally surfactant-type organic inhibitors are frequently applied based on their critical micelle concentration (CMC) values and their adsorption were evaluated based on reduction in corrosion rate. In this work the relationship between CMC and inhibitor adsorption was explored using a quartz crystal microbalance (EQCM); two quaternary ammonium model compounds with different alkyl tail lengths introduced at concentrations above and below their CMC. The quaternary ammonium model compounds were synthesized in-house and characterized by 1H NMR prior to their use. Their CMCs were determined using surface tension measurements. It was found that at concentrations above and below CMC adsorption of the inhibitors is approximately identical and corresponds to their existing as multilayers on the substrate.

Product Number: 51319-13004-SG
Author: Negar Moradighadi
Publication Date: 2019
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