Synergistic Inhibition Effect of Cuscuta Chinensis Lam Extract and Potassium Iodide on Cold Rolled Steel in Hydrochloric Acid

doi:10.11902/1005.4537.2022.037

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 77-86 DOI: 10.11902/1005.4537.2022.037

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Synergistic Inhibition Effect of Cuscuta Chinensis Lam Extract and Potassium Iodide on Cold Rolled Steel in Hydrochloric Acid

WU Hao¹, DENG Shuduan², LI Xianghong¹(

)

^1.Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China, College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China
^2.Faculty of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China

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Abstract

Cuscuta chinensis Lam extract (CCLE) was obtained from the dodder, which is a kind of parasitic plant, by circulation reflux method. The synergistic inhibition effect of CCLE and KI on cold rolled steel in 1.0 mol/L HCl solution was studied by mass loss method, potentiodynamic polarization curve measurement and electrochemical impedance spectroscope, as well as electron microscope (SEM) and atomic force microscope (AFM). The results showed that CCLE acts as an efficient inhibitor for cold rolled steel in HCl solution, and the maximum inhibition efficiency is 84.0%. The inhibition can be further increased to 90.8% for the combination of CCLE with KI. All the synergism parameters are higher than unity for the design of various compound concentrations and test temperatures. The adsorption of CCLE and CCLE/KI obey Langmuir isotherm. When CCLE is incorporated with KI, both of the adsorption equilibrium constant (K) and the absolute value of standard adsorption free energy (ΔG⁰) becomes larger. CCLE and CCLE/KI can be arranged as mixed-type inhibitors, and the inhibition coefficient is strengthened after combination. There exists a single capacitive loop in the Nyqusit diagram. The charge transfer resistance turns to be much higher for the combination of CCLE with KI. SEM and AFM observation result also proves that the combination of CCLE and KI presents a significantly synergistic inhibition effect on the surface of cold rolled steel in HCl solution.

Key words: corrosion inhibitor synergistic inhibition effect cold rolled steel Cuscuta chinensis Lam potassium iodide hydrochloric acid

Received: 12 February 2022 32134.14.1005.4537.2022.037

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52161016);Fundamental Research Project for Distinguished Young Scholars in Yunnan Province(202001AV070008);Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan(51900109);Open project of Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China(2021-KF10)

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WU Hao, DENG Shuduan, LI Xianghong. Synergistic Inhibition Effect of Cuscuta Chinensis Lam Extract and Potassium Iodide on Cold Rolled Steel in Hydrochloric Acid. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 77-86.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.037 OR https://www.jcscp.org/EN/Y2023/V43/I1/77

Fig.1 FTIR spectrum of CCLE

Fig.2 Inhibition efficiencies (η_w) of CCLE (a) and CCLE+10 mg/L KI (b) as functions of inhibitor concentration (c) in 1.0 mol/L HCl solution at different temperatures

Fig.3 Synergistic inhibition parameter (s) of CCLE/KI as a function of CCLE concentration (c) in 1.0 mol/L HCl at 20-50 ℃

Fig.4 Fitted straight lines of c/θ-c for CCLE (a) and CCLE+10 mg/L KI (b)

Inhibitor	T / ℃	r²	Slope	Intercept	K / L·mg^-1	$Δ$ G⁰ / kJ·mol^-1
CCLE	20	0.9951	1.21	9.34	0.1071	-28.23
	30	0.9967	1.10	9.37	0.1067	-29.18
	40	0.9988	1.13	6.55	0.1527	-31.08
	50	0.9982	1.10	13.59	0.0736	-30.11
CCLE+10 mg/L KI	20	0.9998	1.12	2.04	0.4893	-31.93
	30	0.9999	1.09	1.49	0.6721	-33.82
	40	0.9999	1.06	4.09	0.2443	-32.30
	50	0.9997	1.06	6.81	0.1469	-31.96

Table 1 Linear regression parameters of c/θ-c and adsorption thermodynamic parameters

Fig.5 Potentiodynamic polarization curves of cold rolled steel in 1.0 mol/L HCl solutions containing CCLE (a) and CCLE+10 mg/L KI (b)

Table 2 Potential polarization parameters of cold rolled steel in 1.0 mol/L HCl solutions containing CCLE and CCLE+KI at 20 ℃

Fig.6 Nyquist plots (a, d), Bode moduli (b, e) and Bode phases (c, f) of cold rolled steel at 20 ℃ in 1.0 mol/L HCl solutions containing CCLE (a-c) and CCLE+10 mg·L^-1 KI (d-f)

Fig.7 Equivalent circuit used for fitting EIS data

Table 3 Fitting parameters of EIS of cold rolled steel in 1.0 mol/L HCl solutions without and with CCLE and CCLE/KI at 20 ℃

Fig.8 SEM surface micrographs of cold rolled steel samples before (a) and after (b-e) immersion at 30 ℃ for 6 h in 1.0 mol/L HCl solutions without (b) and with 10 mg/L KI (c), 100 mg/L CCLE (d), 10 mg/L KI+100 mg/L CCLE (e)

Fig.9 3D-AFM micrographs of the surfaces of cold rolled steel samples before (a) and after immersion at 30 ℃ for 6 h in 1.0 mol/L HCl solutions without (b) and with (c) 10 mg/L KI, 100 mg/L CCLE (d), 10 mg/L KI+100 mg/L CCLE (e)

Table 4 AFM determined surface rough parameters of cold rolled steel samples before and after immersion at 30 ℃ for 6 h

Fig.10 Schematic illustration of collaborative adsorption

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