Abstract
The efficiency of corrosion inhibition for waterborne polyurethane based on N-tert-butyl diethanolamine (tB-WPU) is investigated using different techniques. Corrosion weight loss, open circuit potential experiments, electrochemical impedance spectroscopy, and potentiodynamic polarization measurements show that both a commercial reagent and a polyurethane-based inhibitor prevent corrosion at increasing temperature to 50 °C. At 75 °C, the activity of both reagents is reduced. In stirring conditions, the effectiveness of acid corrosion inhibition (25 °C, 500 ppm) drops abruptly from 89.5% to 60.7%, which is related presumably to the complexity of binding the polymer molecules to the metal surface. As follows from thermodynamic calculations, the adsorption of tB-WPU on the metal surface in 2M HCl can be treated as a physisorption. Model quantum–chemical calculations support the experimental studies and elucidate the nature of steel surface–inhibitor molecule chemical bond, which is realized mainly by carboxyl and amino groups. It is concluded that WPUs can be considered as a perspective alternative to commercial oilfield reagents due to their versatility.
Highlights
Corrosion is a problem that may have severe economic effects [1]
Corrosioninhibition inhibitionactivity activitywas wasinitially initiallyevaluated evaluatedby bythe the weight weight loss loss method method bebecause. Corrosion it is considered an easy method for finding out how inhibitor concentration affects cause it is considered an easy method for finding out how inhibitor concentration affects its efficiency
With an increase in inhibitor concentration, the polarization resistance value incan be explained by an increase in the inhibitor adsorption rate and, consequentially, an creases, which can be associated with the formation of a polymer film on the metal surface increase in the protective layer thickness [53,54]
Summary
Corrosion is a problem that may have severe economic effects [1]. Carbon steel (CS) is a widely used alloy, due to its affordable cost and high strength characteristics. A challenge is to create multifunctional reagents that would be commercially available and environmentally friendly, on the one hand, and could efficiently inhibit several processes simultaneously, on the other hand. Our team developed a new, promising class of hydrate formation inhibitors based on water-soluble polyurethanes [25–28] These compounds have manifested significant benefits in inhibiting hydrate formation, as compared to commercial reagents, such as Luvicap EG and Luvicap. The polymer under study inhibits quite efficiently both acid corrosion of steel 3 at 25 ◦ C and the nucleation/growth of gas hydrates (comparable to commercial inhibitors). This reagent shows a complex action, which is promising for oilfield chemistry [24]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
