Synthesis of a Novel Gemini Cationic Surfactant and Its Inhibition Behaviour and Mechanism Study on 2024 Al-Cu-Mg Alloy in Acid Solution

Abstract

Isopropylamine was taken as a raw material to synthesize a new multi-alkyl multiple quaternary-ammonium salts gemini surfactant bis[2-hydroxy-3-(dodecyldimethylammonio)propyl]-isopropylamine dichloride. The structure of the synthetic product was characterized by 1H NMR and FTIR. The surface activity was investigated; the inhibition efficiencies and inhibition mechanism of the synthetic product were studied by weight loss method, electrochemical method, microscopic morphology observation, and adsorption model calculation. The results indicate that cmc of synthetic product was 9.204 × 10-4 mol/L; when the concentrations were lower than cmc, the inhibition efficiencies rose substantially, which was up to 89.3% with the concentration of 9.204 × 10-4 mol/L; when they were higher than cmc, inhibition efficiencies were basically unchanged; polarization tests showed that the synthesis product could restrain both anodic and cathodic reactions; when the concentrations were lower than cmc, the adsorption of the synthetic product conformed to the Langmuir model, which formed monolayer on the 2024 Al-Cu-Mg alloy surface; when they were higher than cmc, it formed bilayer, so the adsorption of the synthetic product did not conform to the Langmuir model anymore.

Synthesis and Technology of Nanoemulsion-Based Pesticide Formulation

“…CMC value is a point at which self-assembly occurs and the addition of surfactant after this point is no longer reduces the surface tension. Several techniques have been used in revealing the CMC value such as fluorescence probe [84], surface plasmon resonance [85], dye solubilization [86], tensiometer [87], viscometry [88], calorimetry [89] and electrical conductivity [90].…”

The Preparation of a Novel Corrosion Inhibitor and Its Corrosion Inhibition Behavior on 2024 Al‐Cu‐Mg Alloy in Acid Solution

“…The mass before and after corrosion is accurate to 0.1 mg. The corrosion rate (V) and corrosion IE (%) of the 2024 aluminum alloy were obtained by the following equations (Du et al, ): where m 0 / m is the mass before and after corrosion of the test piece (g); S is the area of the test piece soaking (cm 2 ); t is the corrosion time (h). V 0 / V is the average corrosion rate (g·cm −2 · h −1 ) of the test piece when the corrosion inhibitor is added/not added.…”

“…The reciprocal of the intercept of the Langmuir adsorption model fitting curve is the adsorption equilibrium constant K. The relationship between K and the adsorption free energy (kJ mol −1 ) is as follows (Du et al, ): …”

“…The mass before and after corrosion is accurate to 0.1 mg. The corrosion rate (V) and corrosion IE (%) of the 2024 aluminum alloy were obtained by the following equations (Du et al, 2018):…”

“…In recent years, the study of corrosion inhibition performance using Gemini surfactants is more prevalent (Al-Amiery et al, 2014;Asefi and Mahmoodi, 2010;Cao and Hou, 2016;Du et al, 2018;Hegazy and Abdallah, 2010;Qiu et al, 2008;Qiu and Lv, 2016;Song et al, 2011;Wang et al, 2010;Xia et al, 2015Xia et al, , 2016Zhang et al, 2011Zhang et al, , 2015. Most studies have focused on the corrosion inhibition performance of steel.…”