Novel Biobased Nonionic Surfactants: Synthesis, Surface Activity and Corrosion Inhibition Efficiency Against Aluminum Alloy Dissolution in Acidic Media

Abstract

Four nonionic surfactants were prepared from the reaction of propylene oxide with oleic acid, linoleic acid, and the free fatty acid mixture from hydrolysis of jatropha oil. The chemical structures of the prepared surfactants were confirmed using IR and NMR spectroscopy. The surface activities of the prepared surfactants were dependent on the polypropylene oxide chain length and also on the nature of the alkyl chains. The nonionic surfactants were evaluated at different concentrations as corrosion inhibitors against the corrosion of Al 6061 aluminum in 2 M HCl solution. The corrosion inhibition tendencies of the surfactants were completely dependent on the fatty acid ratio in the jatropha oil and also on the polypropylene oxide chain length. The corrosion inhibition efficiencies of the surfactants were correlated to their chemical structure and their surface activities.

New Biodegradable Nonionic‐Anionic Surfactants Based on Different Fatty Alcohols as Corrosion Inhibitors for Aluminum in Acidic Medium

“…It is also shown in the table that the value of the corrosion potential E corr does not change appreciably after the addition of surfactants which strengthens the same conclusions (Sayyah et al, 2014). It is cleared also from Table 2 that by increasing the concentration of the inhibitors the value of i corr decreases and the IE% increase which suggests that at higher concentration of the inhibitor the protective layer tend to be more complete (Negm et al, 2014).…”

An Amino Acid Functionalized Ionic Liquid as A Multifunctional Lubricant Additive in Water-Glycerol

“…The surface tension firstly decreases quickly and subsequently increase slowly with the rising concentration. The critical micelle concentration (CMC) of ［osar］ ［ mea］ in water-glycerol can be speculated to approach 0.5％ in that the surface tension falls to the valley of the curve as the concentration of ［osar］ ［ mea］ reaches 0.5％ 32) .…”

Novel Quaternary Ammonium‐Based Cationic Surfactants: Synthesis, Surface Activity and Evaluation as Corrosion Inhibitors for C1018 Carbon Steel in Acidic Chloride Solution

“…So, the surface activity parameters of 3a-c compounds in water and 15% HCl aqueous solution at 30°C are listed in Table 3. The maximum surface excess concentration at the air/water interface (C max ) can be calculated by the Gibbs adsorption isotherm equation [48][49][50]:…”