Performance evaluation of an imidazoline corrosion inhibitor in a CO2-saturated environment with emphasis on localised corrosion. (November 2020)

• Record Type: Journal Article
• Authors: Shamsa, Amir; Barker, Richard; Hua, Yong; Barmatov, Evgeny; Hughes, Trevor L.; Neville, Anne
• Is Part Of: Corrosion science. Volume 176(2020)
• Publication Date: 2020-11
• Subjects: CO2 corrosion -- Imidazoline corrosion inhibitor -- Pre-corrosion -- Localised corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108916
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The performance of an imidazoline corrosion inhibitor was quantified in terms of its ability to minimise generalised and localised corrosion. Consideration of localised corrosion behaviour was found to have a significant impact on the determination of the optimum inhibitor dosage. Short term pre-corrosion was found to promote localised corrosion attack. Abstract: The ability of an imidazoline inhibitor to provide corrosion protection to X65 carbon steel in a CO2 -saturated sodium chloride (NaCl) solution at 80 º C was evaluated. The performance of the inhibitor was investigated with respect to both generalised and localised corrosion behaviour using in-situ electrochemical measurements, ex-situ scanning electron microscopy (SEM) and non-contact surface profilometry. We demonstrate that the optimum inhibitor concentration required to minimise generalised corrosion is significantly lower than that required to minimise localised corrosion. This highlights the importance of systematic, post-test topographical measurements in the selection and optimisation of inhibitor dosage.