Mono-, Di- and Tetra-Cationic Surfactants as Carbon Steel Corrosion Inhibitors
Tóm tắt
Corrosion inhibition of three new synthesized cationic surfactants, N-(2-(((Z)-4-(pyridin-4-yl)but-3-en-1-yl)amino)ethyl)-N-(2-((E)-(pyridin-4-ylmethylene)amino)ethyl)dodecan-1-aminium bromide I(4N), N
1,N
2-didodecyl-N
1-((Z)-4-(pyridin-4-yl)but-3-en-1-yl)-N
2-(2-((E)-(pyridin-4-ylmethylene)amino)ethyl)ethane-1,2-diaminium bromide II(4N) and 1-dodecyl-4-((E)-((2-(dodecyl(2-(dodecyl((Z)-4-(1-dodecylpyridin-1-ium-4-yl)but-3-en-1-yl)ammonio)ethyl)ammonio)ethyl)imino)methyl)pyridin-1-ium bromide IV(4N) on carbon steel was investigated by weight loss, electrochemical impedance spectroscopy and polarization measurements. Results show that the synthesized cationic surfactants inhibit corrosion of carbon steel in 1 M HCl. The inhibitive action occurs by virtue of adsorption on the metal surface following a Langmuir adsorption isotherm model. Polarization curves reveal that the investigated cationic surfactants can be classified as mixed inhibitor types. The variations in the corrosion inhibition efficiency between three cationic surfactants are correlated with their chemical structures, with more hydrophobic surfactants yielding higher inhibition efficiency.
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