Abstract
A gemini surfactant imidazoline type, namely N-(3-(2-fatty-4,5-dihydro-1H-imidazol-1-yl) propyl) fatty amide, has been obtained from the fatty acids contained in the mango seed and used as a CO2 corrosion inhibitor for API X-120 pipeline steel. Employed techniques involved potentiodynamic polarization curves, linear polarization resistance, and electrochemical impedance spectroscopy. These tests were supported by detailed scanning electronic microscopy (SEM) and Raman spectroscopy studies. It was found that obtained gemini surfactant greatly decreases the steel corrosion rate by retarding both anodic and cathodic electrochemical reactions, with an efficiency that increases with an increase in its concentration. Gemini surfactant inhibits the corrosion of steel by the adsorption mechanism, and it is adsorbed on to the steel surface according to a Langmuir model in a chemical type of adsorption. SEM and Raman results shown the presence of the inhibitor on the steel surface.
Highlights
The problems caused for carbon steel in the oil and gas industry due to carbon dioxide (CO2 ) corrosion is still a serious and costly problem [1]
A gemini surfactant, N-(3-(2-fatty-4, 5-dihydro-1H-imidazol-1-yl) propyl) fatty amide, has been synthetized from the fatty acids contained in the mango seed and used as CO2 corrosion inhibitor for API X-120 steel
Adsorption of the gemini surfactant corrosion inhibitor produced a decrease in the corrosion rate of steel and it was found to follow the Langmuir adsorption isotherm
Summary
The problems caused for carbon steel in the oil and gas industry due to carbon dioxide (CO2 ) corrosion is still a serious and costly problem [1]. Deyab and Mohsen evaluated cationic gemini surfactant, 1,2-bis(dodecyldimethylammonio) ethane dibromide (DMAEB), as corrosion inhibitor for N80 C-steel pipe in acid washing solution (15.0% HCl) Electrochemical techniques such as potentiodynamic polarization curves and electrochemical impedance spectroscopy in combination with gravimetric weight loss techniques were used, obtaining inhibitor efficiency values higher than 90%. Green chemistry and the development of efficient, environmentally friendly corrosion inhibitors has become a significant point of focus within the oil and gas industry [34] Different organic compounds such as amides, amines or imidazolines have been extracted from different agro-industrial wastes such as coffee bagasse, coconut, avocado and rice brain and used as corrosion inhibitors for steel in acidic environments including. The goal of this research work is to evaluate the use of a gemini surfactant imidazoline kind obtained from mango seed as a green inhibitor for the CO2 corrosion of X-120 steel. By comparing with previously published results [35,36,37,38], to try to find a correlation between the alkyl chain length, the presence of double bond of the hydrophobic chain of imidazoline and its inhibition performance
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