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42. Inhibition of mild steel corrosion and calcium sulfate formation in highly saline synthetic water by a newly synthesized anionic carboxylated surfactant.

Author

Al-Sabagh, A.M., Migahed, M.A., Sadeek, S.A., and El Basiony, N.M.

Subjects
STEEL corrosion, DEGRADATION of steel, STAINLESS steel, SPECTRUM analysis, SURFACE active agents
Abstract

Abstract A newly anionic surfactant; namely (2Z,2′Z)-4,4′-(ethane-1,2-diylbis((2-((4-dodecylphenyl)sulfonamido)ethyl)azanedinyl)bis(4-oxobut-2enoate), desined as Tetra-anionic surfactant was synthesized. Its chemical structure was confirmed by FTIR and 1HNMR spectroscopic techniques. The corrosion mitigation behavior of the prepared surfactant for mild steel (MS) in high saline synthetic water was monitoring by chemical technique (weight loss), electrochemical techniques (Tafel and EIS). The obtained results showed that the corrosion resistance has been improved after the addition of the surfactant molecules. The inhibition efficiency grown up with the inhibitor concentration reaching the maximum at concentration 120 ppm, where the IE% values were 84, 82, and 79.5% in cases of weight loss, Tafel and EIS techniques, respectively. The mixed-type inhibitor with permanent anodic effect can be inferred from polarization data of mild steel in the presence of different concentration of Tetra- compound. The corrosion protection performance of the used inhibitor was related to its adsorption ability on the MS surface. The adsorption of Tetra-molecules increased the charge transfer resistance of MS. The adsorption process of the tested corrosion inhibitor obeyed Langmuir adsorption isotherm. The corrosion and scale produced layer formed on the mild steel surface in absence and presence of the insight anionic surfactant was depicted by SEM. The chemical analysis of this layer was examined by EDX, and show the corrosion and Ca- scale inhibition performance of Tetra- molecules. Quantum chemical calculations were compatible with the experimental results. [ABSTRACT FROM AUTHOR]

Published
2018
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44. Corrosion Control of Cu-10Al-10Ni and Cu-10Al-10Zn Alloys in Seawater Environment by Some Ethoxylated Tolyltriazole Derivatives

Author

Nady, H., El-Rabiei, M.M., Migahed, M.A., and Fathy, M.

Abstract

Protection of metals from being damaged under the effect of corrosion occurs by several methods like the addition of alloying elements or inhibitors. A new family of some nonionic surfactants based on tolyltriazole derivatives (TTAs) having various ethoxyl chain lengths were prepared and their chemical structure was elucidated by using different spectroscopic techniques (FTIR and 1H-NMR). The corrosion inhibition capability of these surfactants [TTA, TTA (12) and TTA (24)] was investigated on two Cu-ternary alloy surfaces (Cu-10Al-10Ni and Cu-10Al-10Zn) in seawater by potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The results revealed that ethoxylated tolyltriazole compounds, TTAs, inhibited corrosion of Cu-ternary alloys in the investigated sea water environment, yielding maximum inhibition efficiencies of 92% and 91% for Cu-10Al-10Ni and Cu-10Al-10Zn, respectively. The corrosion and corrosion inhibition behavior of the Cu alloy specimens were influenced by the metal composition and microstructure. The presence of inhibitors and increase of concentration greatly decreases corrosion rate, parameters determined from polarization curves and EIS plots show that inhibitors decrease both cathodic and anodic current densities, suppressing charge transfer processes by adsorption on alloy surface. The corrosion inhibition process is based on the adsorption of the TTAs molecules on the alloy surface, and the adsorption follows the Langmuir adsorption isotherm. The free energy of adsorption of the different tolyltriazole derivatives on the alloy surfaces was in the range of ≈−38 kJ mol−1, which reveals a strong physical adsorption of the inhibitor molecules on the metallic surface. SEM/EDX studies confirmed that TTA inhibitors could protect Cu alloys by adsorption on the alloy surface.

Published
2017
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