菟丝子提取物与碘化钾对冷轧钢在盐酸中的缓蚀协同效应

doi:10.11902/1005.4537.2022.037

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 77-86 CSTR: 32134.14.1005.4537.2022.037 DOI: 10.11902/1005.4537.2022.037

研究报告

本期目录 | 过刊浏览

菟丝子提取物与碘化钾对冷轧钢在盐酸中的缓蚀协同效应

吴浩¹, 邓书端², 李向红¹(

)

^1.西南林业大学化学工程学院西南地区林业生物质资源高效利用国家林业和草原局重点实验室昆明 650224
^2.西南林业大学材料科学与工程学院昆明 650224

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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摘要:

以寄生植物菟丝子 (CCL) 为原料，通过回流提取法从中提取制备出菟丝子提取物 (CCLE)，通过失重法、动电位极化曲线和电化学阻抗谱 (EIS) 测定CCLE和碘化钾 (KI) 复配后对冷轧钢在1.0 mol/L HCl溶液中的缓蚀协同效应。结果表明，CCLE对冷轧钢在HCl中有较好的缓蚀作用，最大缓蚀率为84.0%；其与KI复配后，最大缓释率可进一步提升到90.8%。缓蚀协同效应系数在各复配浓度和温度下均大于1。CCLE和CCLE/KI在冷轧钢表面均符合Langmuir吸附等温式，复配后的吸附平衡常数和标准吸附Gibbs自由能 (ΔG⁰) 绝对值进一步增大。CCLE和CCLE/KI复配均属于混合抑制型缓蚀剂，但复配后对阴阳两极的抑制作用进一步增强。Nyquist图谱呈现单一半圆容抗弧，CCLE和KI复配后，电荷转移电阻明显增大。扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 表面形貌观察也表明，CCLE和KI复配后有效抑制了HCl对冷轧钢表面的腐蚀，两者存在缓蚀协同效应。

关键词 ：缓蚀剂, 缓蚀协同效应, 冷轧钢, 菟丝子, 碘化钾, 盐酸

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

收稿日期: 2022-02-12 32134.14.1005.4537.2022.037

ZTFLH:

TG174

基金资助:国家自然科学基金(52161016);云南省基础研究计划杰出青年项目(202001AV070008);云南省万人计划青年拔尖人才专项(51900109);西南地区林业生物质资源高效利用国家林业和草原局重点实验室开放基金(2021-KF10)

作者简介: 吴浩，男，1991年生，博士生

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引用本文:

吴浩, 邓书端, 李向红. 菟丝子提取物与碘化钾对冷轧钢在盐酸中的缓蚀协同效应[J]. 中国腐蚀与防护学报, 2023, 43(1): 77-86.
Hao WU, Shuduan DENG, Xianghong LI. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.037 或 https://www.jcscp.org/CN/Y2023/V43/I1/77

图1 缓蚀剂CCLE的FTIR谱图

图2 不同温度下1.0 mol/L HCl中缓蚀率 (ηw) 和缓蚀剂浓度 (c) 关系

图3 20~50 ℃时1.0 mol/L HCl溶液中缓蚀协同效应系数 (s) 和CCLE浓度 (c) 的关系

图4 CCLE和CCLE+10 mg/L KI的c/θ-c拟合直线

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

表1 c/θ-c线性回归参数和吸附热力学参数

图5 冷轧钢在1.0 mol/L HCl中的动电位极化曲线

表2 20 ℃时冷轧钢在1.0 mol/L HCl中CCLE和CCLE/KI作用下动电位极化参数

图6 20 ℃时冷轧钢在1.0 mol/L HCl溶液中的EIS谱

图7 拟合EIS数据的等效电路图

表3 20 ℃时冷轧钢在不含和含有CCLE和CCLE/KI的1.0 mol/L HCl中的EIS拟合参数

图8 冷轧钢表面的SEM微观形貌

图9 冷轧钢表面的3D-AFM微观形貌

表4 AFM测试的冷轧钢表面粗糙度参数

图10 协同吸附示意图

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