咖啡果皮提取物对钢在三氯乙酸溶液中的缓蚀性能

doi:10.11902/1005.4537.2024.062

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1465-1475 CSTR: 32134.14.1005.4537.2024.062 DOI: 10.11902/1005.4537.2024.062

研究报告

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咖啡果皮提取物对钢在三氯乙酸溶液中的缓蚀性能

穆显菊¹^,², 李向红¹^,², 雷然¹^,², 邓书端¹^,²(

)

1.西南林业大学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.西南林业大学材料与化学工程学院昆明 650224

Inhibitory Action of Coffee Skin Extract on Corrosion of Steel in Trichloroacetic Acid Solution

MU Xianju¹^,², LI Xianghong¹^,², LEI Ran¹^,², DENG Shuduan¹^,²(

)

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

引用本文:

穆显菊, 李向红, 雷然, 邓书端. 咖啡果皮提取物对钢在三氯乙酸溶液中的缓蚀性能[J]. 中国腐蚀与防护学报, 2024, 44(6): 1465-1475.
Xianju MU, Xianghong LI, Ran LEI, Shuduan DENG. Inhibitory Action of Coffee Skin Extract on Corrosion of Steel in Trichloroacetic Acid Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1465-1475.

全文: PDF(8372 KB) HTML

摘要:

采用失重法、电化学法、红外光谱(FTIR)、扫描电子显微镜(SEM)、接触角、表面张力等测试研究了农林废弃物咖啡果皮提取物(CSE)在0.10 mol·L^-1 三氯乙酸(Cl₃CCOOH)中的缓蚀性能。结果表明，500 mg·L^-1 CSE在20℃时缓蚀率高达93.7%；20和30℃下CSE在钢表面的吸附规律遵循Langmuir吸附等温式，而40和50℃下则服从Freundlich吸附等温式，标准吸附Gibbs自由能(ΔG⁰)在-30~-41 kJ·mol^-1范围，CSE在钢表面的吸附类型为以化学吸附为主的混合吸附。CSE属于阴极抑制型缓蚀剂。添加CSE使电荷转移电阻增大，而界面双电层电容值下降。添加CSE的缓蚀钢表面的SEM微观形貌腐蚀程度和粗糙程度显著下降，但疏水性增强。FTIR表明CSE中含有大量O原子和芳香环等极性基团。随着CSE的添加，缓蚀溶液体系的表面张力逐渐降低，溶液电导率增加，钢腐蚀浸泡后，溶液表面张力较浸泡前有所增加，而溶液电导率较浸泡前有所降低。

关键词 ：咖啡果皮提取物, 三氯乙酸, 钢, 缓蚀, 吸附

Abstract：

The corrosion inhibition performance of the agricultural and forestry waste of coffee skin extract (CSE) in 0.10 mol·L^-1 trichloroacetic acid (Cl₃CCOOH) for plate of a cold rolled steel (CRS) was investigated by mass loss method, electrochemical tests, infrared spectroscopy (FTIR), scanning electron microscope (SEM), contact angle and surface tension measurements. The results show that the inhibition efficiency of 500 mg·L^-1 CSE can reach as high as 93.7% at 20^oC. The adsorption of CSE on CRS follows Langmuir adsorption isotherm at 20^oC and 30^oC, while follows Freundlich adsorption isotherm at 40^oC and 50^oC. The standard Gibbs free energy (ΔG⁰) is in the range of -30~-41 kJ·mol^-1. The adsorption type of CSE on CRS is the mixed adsorption mainly by chemisorption. CSE is a cathodic-type inhibitor. With the presence of CSE in 0.10 mol·L^-1 trichloroacetic acid solution the charge transfer r reactance increases, while the interface double layer capacitance reduces for the steel surface. As a subsequence, the corrosion degree and roughness of the steel surface decrease significantly, but its hydrophobicity is enhanced. FTIR confirms that CSE contains a large number of polar groups such as O atoms and aromatic rings. As the CSE concentration increases, the surface tension of the corrosive Cl₃CCOOH solution gradually decreased, and the conductivity of the solution increased. After the immersion of the test steel in the solution, the surface tension of the solution is increased, while its conductivity decreased.

Key words： coffee skin extract trichloroacetic acid steel corrosion inhibition mechanism adsorption

收稿日期: 2024-02-28 32134.14.1005.4537.2024.062

ZTFLH:

TG174

基金资助:国家自然科学基金(52161016);云南省农业基础研究联合专项重点项目(202101BD070001-017);云南省万人计划青年拔尖人才专项(51900109);云南省基础研究计划重点项目(202301AS070043);西南林业大学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项目(2022-KF08)

通讯作者: 邓书端，E-mail：dengshuduan@163.com，研究方向为缓蚀剂

Corresponding author: DNEG Shuduan, E-mail: dengshuduan@163.com

作者简介: 穆显菊，女，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.062 或 https://www.jcscp.org/CN/Y2024/V44/I6/1465

图1 CSE提取流程

图2 20~50℃时冷轧钢在0.10 mol·L-1 Cl3CCOOH溶液中浸泡6 h后的腐蚀速率和缓蚀率随CSE浓度的变化曲线

表1 文献中报道的不同植物提取物作为缓蚀剂时对钢在不同溶液中的缓蚀率

图3 在20~50℃时，CSE在冷轧钢表面的Langmuir和Freundlich吸附等温线

表2 Langmuir和Freundlich吸附等温式的线性拟合参数和ΔG0

图4 在20℃下，冷轧钢在不含和含有CSE的0.10 mol·L-1 Cl3CCOOH溶液中的动电位极化曲线

c mg·L^-1	$E c o r r$ mV	$I c o r r$ μA·cm^-2	$b c$ mV·dec^-1	$b a$ mV·dec^-1	$η p$ %
0	-346	2274	-297	254	-
50	-346	1115	-263	72	51.0
250	-462	361	-229	142	84.1
500	-455	147	-259	113	93.5

表3 在20℃下，冷轧钢在不含和含有CSE的0.10 mol·L-1 Cl3CCOOH溶液中的动电位极化曲线拟合参数

图5 在20℃下，冷轧钢在不含和含有CSE的0.10 mol·L-1 Cl3CCOOH溶液中的电化学阻抗谱、Bode相角和模量、等效电路图

c mg·L^-1	R_s Ω·cm²	R_t Ω·cm²	R_L Ω·cm²	χ² 10^-3	a	CPE μΩ^-1·s ^a ·cm^-2	C_dl μF·cm^-2	$η R$ %
0	9.9	4.8	9.6	44.5	0.8337	1920.0	760.4	-
50	19.2	12.8	83.2	43.9	0.8963	379.0	200.8	71.2
250	14.1	110.5	2260.0	1.3	0.8698	94.2	49.0	97.0
500	11.7	215.0	1479.0	1.0	0.8394	79.3	35.5	98.3

表4 在20℃下，冷轧钢在不含和含有CSE的Cl3CCOOH溶液中的EIS拟合参数

图6 CS、CSE以及冷轧钢在含CSE的Cl3CCOOH溶液中表面吸附层的FTIR图谱

图7 冷轧钢表面的SEM显微和接触角图像

图8 在20℃时表面张力、电导率与CSE浓度的关系

图9 CSE缓蚀机理示意图以及CSE中主要成分结构式

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