Corydalis yanhusuo extract as a green inhibitor for J55 steel in 3.5%NaCl solution saturated with CO₂

ABSTRACT

In this study, Corydalis yanhusuo extract acts as a green inhibitor for J55 steel in 3.5% NaCl solution saturated with CO₂. Rapid resolution liquid chromatography shows the concentrations of Palmatine to be 0.6358 g/L, Tetrahydropalmatine 0.7715 g/L, and Corydaline 0.3755 g/L. Potentiodynamic polarization results suggest that Corydalis yanhusuo extract is a mixed-type inhibitor. The inhibition efficiency of Corydalis yanhusuo extract increases with the increase of concentration and reaches 92.36% at 5%v/v but decrease with the increased temperature. The inhibition efficiency is 69% at 80°C. The protective film formed on the metal surface was confirmed by Fourier transforms infrared spectroscopy, UV–visible, scanning electrochemical microscope and scanning electron microscope methods. The quantum chemical calculations predicate that Palmatine acts as the major component for inhibition performance.

GRAPHICAL ABSTRACT

KEYWORDS:

• J55 steel
• CO₂ corrosion
• Corydalis yanhusuo extract
• SECM

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Yuanhua Lin is a professor in the school of material science and engineering, at the southwestern petroleum university. He is also the fixed Researcher for National Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering and the Director of CNPC Key Lab for Tubular Goods Engineering. His research interests are oil and gas drilling technology and oil well pipe materials.

Zhipeng Sun received his Bachelor's and Master's degrees in 2016 and 2019, respectively, from southwestern petroleum university, China. He is now pursuing his Ph.D. at the University of Science & Technology Beijing. The current research of him is focuses on the development of corrosion inhibitors.

Xi Luo now is an associate researcher in the Engineering Research Institute North China Branch Company of SINOPEC, Zhengzhou. He received his Master's degree from China University of Petroleum (East China). His research mainly engaged in gas production technology research.

Wanying Liu is an experimentalist in the school of material science and engineering, at the southwestern petroleum university. She is now pursuing her Ph.D. under the supervision of Prof. Ying Liu at the Sichuan university. Her research area mainly focuses on the corrosion and protection of metal materials and surface engineering technology.

Xuefeng Deng received his Master degree from China University of Petroleum (East China), majoring in the development of oil and gas filed. He is now working in SINOPEC for oil recovery engineering.

Jinchang Wang is an associate researcher in the SINOPEC. He received his Bachelor's and Master's degrees from Southwest Petroleum University. He is now pursuing his Ph.D. under the supervision of Prof. Yuanhua Lin. His research mainly engaged in drilling engineering and the corrosion of oil and gas materials.

Additional information

Funding

Authors are thankful for the financial assistance provided by Key Technology for Development of Low – Abundance and Low Permeability Reservoirs of National Science and Technology Major Project of the Ministry of Science and Technology of China [grant number 2016ZX05048].