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Three novel cationic surfactants incorporated with 1,3,5-triethanolhexahydro-1,3,5-triazine moiety were prepared and characterized. The inhibition efficiency of the prepared surfactants toward the carbon steel in 1 M HCl solution was investigated by weight loss, electrochemical polarization, and electrochemical impedance spectroscopy techniques. The maximum obtained efficiency was exhibited by N-dodecyl-1,3,5 tris (2-Hydroxypropane)1,3,5 triazinyl N-dodecylammonium bromide (DODT) against the three used techniques. The efficiencies were 97.0%, 94.4%, and 91.07%, respectively. The surface active properties for these surfactants were investigated. The quantum chemical parameters were also calculated. The data was discussed in light of surface active, corrosion inhibition, and quantum chemical properties to characterize the adsorption mechanism. [ABSTRACT FROM PUBLISHER]

The adsorption and corrosion inhibitive effect of acid red GRE (183) dye on carbon steel alloy in 1 M HCl solutions was studied using various techniques. Results of weight loss, Tafel polarization measurements and electrochemical impedance spectroscopy (EIS) techniques show that this compound has fairly good inhibiting properties for steel corrosion in acidic bath; with efficiency around 96% at a concentration of 50 ppm. The inhibition is of a mixed anodic–cathodic nature. Factors affecting the corrosion process have been calculated and discussed. Acid red GRE (183) dye was shown to be an inhibitor in the acidic corrosion. Inhibition efficiency increased with acid red GRE (183) dye concentration but decreased with rise in temperature, corrosion inhibition is attributed to the adsorption of acid red GRE (183) dye on the carbon steel surface via a physical adsorption mechanism. Langmuir isotherm is found to provide an accurate description of the adsorption behavior of the investigated azo compound. The nature of the protective film was investigated using SEM and EDX techniques. [ABSTRACT FROM AUTHOR]

Three structurally different amino acids (Leucine, phenyl alanine and methionine) were reacted with oleic acid and polyethylene glycol (600) to give three nonionic surfactants (S 1 , S 2 and S 3 ). The chemical structures of the prepared surfactants were confirmed by FT-IR and 1 H, 13 CNMR. The surface parameters were calculated by surface tension measurements. The inhibition efficiencies of the prepared inhibitors on carbon steel in 1 M HCl were studied using polarization, and electrochemical impedance spectroscopy. Correlation between the quantum chemical calculations and inhibition efficiency was discussed. From the obtained results, the inhibitor based on L-phenyl alanine has high efficiency (94.14% at 1 × 10 − 3 mol L − 1 ) more than the other inhibitors. [ABSTRACT FROM AUTHOR]