Impact of corrosion products on performance of imidazoline corrosion inhibitor on X65 carbon steel in CO2 environments. (June 2021)

• Record Type: Journal Article
• Authors: Shamsa, Amir; Barker, Richard; Hua, Yong; Barmatov, Evgeny; Hughes, Trevor L.; Neville, Anne
• Is Part Of: Corrosion science. Volume 185(2021)
• Publication Date: 2021-06
• Subjects: CO2 corrosion -- Imidazoline inhibitor -- Localised corrosion -- Iron carbonate; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109423
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Corrosion protection was found to be a function of two factors, inhibitor adsorption/film formation and presence of corrosion products. The presence of an FeCO3 -rich layer with high coverage of the steel surface resulted in the inhibitor only proving ∼25% of the overall protection. The nature of the steel surface in the presence of FeCO3 had a significant influence on the adsorption kinetics of the corrosion inhibitor. The nature of the steel surface had a major influence on the severity of the localised corrosion behaviour. The imidazoline based corrosion inhibitor was found to increase the rate of dissolution of FeCO3 . Abstract: The impact of pre-corrosion on the performance of an imidazoline-based corrosion inhibitor was evaluated with respect to inhibition of uniform and localised corrosion in CO2 -environments. Corrosion protection was found to be a function of two factors, inhibitor adsorption/film formation and presence of corrosion products. This effect was most significant in the presence of a continuous FeCO3 -rich layer with high coverage of the steel surface, resulting in the inhibitor only providing ∼25 % of the overall protection afforded by the corrosion inhibitor and FeCO3 . The presence of corrosion products had a significant influence on inhibitor adsorption and on corrosion pit depth.