Corrosion Inhibition and Antibacterial Performance of Eclipta Prostrata Extract

doi:10.11902/1005.4537.2025.203

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 845-854 DOI: 10.11902/1005.4537.2025.203

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Corrosion Inhibition and Antibacterial Performance of Eclipta Prostrata Extract

HE San¹(

), YI Sijie¹, CAI Xinyue², LUO Jianhong³, JIANG Yufei¹, YANG Chen¹, WANG Shengyi¹

^1.College of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610500, China
^2.China Sea Petroleum Power Group Co. Ltd., Jiangsu Branch, Nanjing 210019, China
^3.Petrochina Southwest oil and Gasfield Company, Chengdu 610051, China

Cite this article:

HE San, YI Sijie, CAI Xinyue, LUO Jianhong, JIANG Yufei, YANG Chen, WANG Shengyi. Corrosion Inhibition and Antibacterial Performance of Eclipta Prostrata Extract. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 845-854.

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Abstract

The rapid growth of shale gas production has led to frequent CO₂ corrosion and SRB corrosion during operations. Traditional organic corrosion inhibitors and bactericides are not environmentally friendly. To develop a green dual-functional agent, Eclipta extract was prepared using ultrasonic-assisted ethanol extraction. The corrosion inhibition performance and antibacterial performance of the acquired Eclipta extract were studied by electrochemical test, weight loss measurement, extinction dilution method and surface analysis technology, while its functional groups was characterized by FTIR and XPS. Results showed that the corrosion inhibition efficiency of 20# steel in a real produced water from a gas field in the Southwest China at 35℃ reached 94.31% for a dosage of 5% Eclipta extract (in volume ratio). The antibacterial effect on SRB was enhenced with the increasing Eclipta extract volume ratio. The adsorption on 20# steel surface of Eclipta extract followed the Langmuir adsorption model. Effective components (e.g., quercetin and ecliptasaponin A) adsorbed onto the metal surface to form a dense protective film. Quantum chemical calculations showed that the adsorption properties of quercetin were superior to those of eclipcoside A and stigmasterol. Additionally, flavonoids in the extract could inhibit bacteria by binding and denaturing proteins. Eclipta extract shows good prospect as a green dual-functional agent for corrosion inhibition and bacterial suppression.

Key words: Eclipta prostrata CO₂ corrosion SRB corrosion 20# steel

Received: 26 June 2025 32134.14.1005.4537.2025.203

ZTFLH:

TG174

Fund: Sichuan Provincial Department of Science and Technology Fund Project(2020YJ0393);Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(PLN0448)

Corresponding Authors: HE San, E-mail: hesan@126.com

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	HE San
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	YANG Chen
	WANG Shengyi

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.203 OR https://www.jcscp.org/EN/Y2026/V46/I3/845

Fig.1 Nyquist plots of eclipta prostrata extract in corrosive solution under 25 ℃ (a), 35 ℃ (b) and 45 ℃ (c)

Fig.2 Equivalent circuit of the corrosive solution without (a) and with (b) eclipta prostrata extract

Table 1 Fitting results of electrochemical impedance spectroscopy of in corrosive solution containing eclipta prostrata extract under different temperatures and concentrations

Fig.3 Polarization curves of 20# carbon steelin corrosive solution containing eclipta prostrata extract under 25 ℃ (a), 35 ℃ (b) and 45 ℃ (c)

Table 2 Electrochemical parameters derived from polarization curves of 20# carbon steel in corrosive solution containing eclipta prostrata extract under different temperatures and concentrations

Fig.4 Uniform corrosion rate and average inhibition efficiency from static weight loss experiments

Fig.5 Corrosion morphology of 20# carbon steel in corrosive solution with and without eclipta prostrata extract: (a) without additive, (b) addition of extract 5%

Fig.6 Adsorption isotherm of eclipta prostrata extract on 20# steel surface at 35 ℃: (a) Langmuir adsorption isotherm fitting, (b) Temkin adsorption isotherm fitting, (c) Freundlich adsorption isotherm fitting, (d) Frumkin adsorption isotherm fitting

Fig.7 Langmuir adsorption isotherm fitting under 25 ℃ (a), 35 ℃ (b) and 45 ℃ (c)

Fig.8 FT-IR spectrum of eclipta prostrata extract

Fig.9 XPS spectrum of eclipta prostrata extract: (a) C 1s, (b) N 1s, (c) O 1s

Table 3 Frontier molecular orbital (FMO) charge density distribution of three compounds

Table 4 Quantum chemical parameter of three compounds

Table 5 Antibacterial evaluation of eclipta prostrata extract

Fig.10 Surface morphology of SRB in corrosive solution with and without eclipta prostrata extract: (a) without additive, (b) addition of extract at 11% (volume fraction)

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