Synergistic inhibition effects of octadecylamine and tetradecyl trimethyl ammonium bromide on carbon steel corrosion in the H2S and CO2 brine solution

• Published in: Corrosion science 2017-09, Vol.126, p.247-254
• Main Authors: Zhang, Chen, Zhao, Jingmao
• Format: Article
• Language: English
• Subjects: A. Acid solution; A. Carbon steel; B. Polarization; B. Weight loss; B. XPS; C. Acid corrosion; Carbon dioxide; Carbon steels; Corrosion effects; Corrosion inhibitors; Hydrogen sulfide; Mass ratios; Saline water; Studies; X ray photoelectron spectroscopy
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2017.07.006

•Octadecylamine and tetradecyl trimethyl ammonium bromide can effectively reduce the CO2 and H2S induced corrosion of steel.•A good synergistic corrosion inhibition effect of octadecylamine and tetradecyl trimethyl ammonium bromide is observed.•Molecular dynamic simulation technique was used to study the synergism of inhibitors.•The synergism of inhibitors was found correlative to the fraction free volume value of inhibitor film.•Co-adsorption process of inhibitors was studied to explain the synergistic mechanism. The corrosion inhibition performances of octadecylamine (OCT) and tetradecyl trimethyl ammonium bromide (TTAB) for carbon steels in H2S and CO2 brine solution were investigated by weight loss, potentiodynamic polarization, molecular dynamic simulation and XPS analysis. TTAB showed better inhibition effects on H2S and CO2 induced corrosion than OCT. Synergistic corrosion inhibition effect was found between OCT and TTAB with proper mass ratios and the best inhibition performance was achieved with 10mgL−1 OCT and 20mgL −1 TTAB. The synergism was correlative to the fractional free volume of the inhibitor film of OCT and TTAB.