Electrochemical and isothermal adsorption studies on corrosion inhibition performance of β-cyclodextrin grafted polyacrylamide for X80 steel in oil and gas production

• Published in: Journal of molecular structure 2021-03, Vol.1228, p.129737, Article 129737
• Main Authors: Wang, Chengjun, Zou, Changjun, Cao, Yixuan
• Format: Article
• Language: English
• Subjects: Adsorption; Corrosion inhibition; Grafted polymer; SEM; X80 steel
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2020.129737

•An eco-friendly polymer β-CD-PAM is developed as a superior mixed-type inhibitor for X80 steel corrosion.•Based on simple synthesis and significant corrosion inhibition efficiency, the green inhibitor is superior to that of same family.•The inhibitor has shown the excellent performance of corrosion inhibition at different temperatures, by means of the adsorption of β-CD-PAM on metal surface. In this work, β-cyclodextrin grafted polyacrylamide (β-CD-PAM) has been synthesized and deployed as a green corrosion inhibitor for pipeline steel (X80 steel) in 1 mol/L sulfuric acid solution. The corrosion inhibiting performance of β-CD-PAM was evaluated at different concentrations and temperatures using weight-loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and infrared spectra methods. The results showed that the corrosion of X80 steel in sulfuric corrosion solution was efficiently inhibited by β-CD-PAM. The favorable performance was ascribed to the formation of β-CD-PAM adsorption films, which followed the Langmuir adsorption isotherm. Electrochemical experimental results showed that β-CD-PAM was a mixed type corrosion inhibitor predominantly as cathodic inhibitor. In addition, β-CD-PAM is adjudged an effective and green corrosion inhibitor and can be utilized as a potential corrosion inhibitor in oil and gas production. [Display omitted]