滇润楠叶提取物对铝在<strong>HCl</strong>中的缓蚀性能

doi:10.11902/1005.4537.2023.234

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 601-611 CSTR: 32134.14.1005.4537.2023.234 DOI: 10.11902/1005.4537.2023.234

研究报告

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滇润楠叶提取物对铝在HCl中的缓蚀性能

魏高飞, 邓书端, 邵丹丹, 徐娟, 李向红(

)

西南林业大学材料与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

Inhibition Action of Machilus yunnanensis Leaves Extract on Corrosion of Al-plate in HCl Medium

WEI Gaofei, DENG Shuduan, SHAO Dandan, XU Juan, LI Xianghong(

)

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

引用本文:

魏高飞, 邓书端, 邵丹丹, 徐娟, 李向红. 滇润楠叶提取物对铝在HCl中的缓蚀性能[J]. 中国腐蚀与防护学报, 2024, 44(3): 601-611.
Gaofei WEI, Shuduan DENG, Dandan SHAO, Juan XU, Xianghong LI. Inhibition Action of Machilus yunnanensis Leaves Extract on Corrosion of Al-plate in HCl Medium[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 601-611.

全文: PDF(8945 KB) HTML

摘要:

采用失重法、电化学法、电感耦合等离子发射光谱仪(ICP-OES)、金相显微镜、扫描电子显微镜(SEM)及接触角测试研究了滇润楠叶提取物(MYLE)在1.0 mol·L^-1 HCl溶液中对Al的缓蚀性能。结果表明：20℃时，1000 mg·L^-1 MYLE的最大缓蚀率可达93.5%，MYLE浓度越高，缓蚀性能越强；而温度越高，缓蚀性能越弱。MYLE在Al表面的吸附主要以化学吸附为主，在低温时符合Langmuir吸附等温式，高温时符合Freundlich吸附等温式。Al在添加MYLE前后的HCl中腐蚀动力学规律符合Arrhenius公式和过渡态理论方程，添加MYLE后表观活化能(E_a)、指前因子(A)、表观活化焓(ΔH_a)、表观活化熵(ΔS_a)均增大。MYLE为混合型缓蚀剂，其电化学缓蚀作用机理为“几何覆盖效应”，Nyquist图主要由高频区的容抗弧和低频区的感抗弧组成，且随着MYLE浓度增大，电荷转移电阻和电感电阻均增大。添加MYLE后，缓蚀体系中Al³⁺浓度明显降低，SEM观察进一步证实了MYLE有效减缓了Al表面的腐蚀程度。

关键词 ：滇润楠叶, 盐酸, 缓蚀, 吸附, Al

Abstract：

The inhibition action of Machilus yunnanensis leaves extract (MYLE) on Al-plate in 1.0 mol·L^-1 HCl solution were studied by means of mass loss method, electrochemical tests, inductively coupled plasma optical emission spectrometer (ICP-OES), metallographic microscope, scanning electron microscope (SEM) and contact angle measurements. The results show that the maximum inhibition efficiency of 1000 mg·L^-1 MYLE at 20^oC can reach as high as 93.5%. The inhibition efficiency increases with the increase of MYLE concentration, while the higher the temperature, the weaker the inhibition performance. The adsorption of MYLE on Al surface is mainly based on chemisorption, which conforms to Langmuir isotherm at lower temperatures and Freundlich isotherm at higher temperatures. The corrosion kinetic reaction of Al in HCl solutions without or with MYLE is in accordance with Arrhenius formula and transition state theory equation. In the presence of MYLE, the relevant apparent activation energy (E_a), pre-exponential factor (A), apparent activation enthalpy (ΔH_a) and apparent activation entropy (ΔS_a) are all increased. MYLE is a mixed inhibitor through “geometric blocking effect”. Nyquist diagram is mainly composed of a capacitive reactance arc in high frequency region and an inductive reactance arc in low frequency region. With the increase of MYLE concentration, both the charge transfer resistance and inductance resistance increase. After the addition of MYLE, the concentration of Al³⁺ in HCl solutions is significantly dropped, and SEM morphology further confirms that MYLE can efficiently slow down the corrosion degree of Al-plate.

Key words： Machilus yunnanensis leaves HCl inhibition adsorption Al

收稿日期: 2023-07-27 32134.14.1005.4537.2023.234

ZTFLH:

TG174

基金资助:国家自然科学基金(52161016);云南省教育厅研究生项目(2022Y566);云南省基础研究计划杰出青年基金(202001AV07-0008);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)

通讯作者: 李向红，E-mail：xianghong-li@163.com，研究方向为缓蚀剂

Corresponding author: LI Xianghong, E-mail: xianghong-li@163.com

作者简介: 魏高飞，女，1997年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.234 或 https://www.jcscp.org/CN/Y2024/V44/I3/601

图1 MYLE提取流程示意图

图2 Al表面形貌

图3 1.0 mol·L-1 HCl中腐蚀速率和缓蚀率与MYLE浓度的关系

图4 不同温度1.0 mol·L-1 HCl中MYLE在Al表面的吸附等温式

表1 线性拟合参数和吸附平衡常数

图5 1.0 mol·L-1 HCl介质中lnK与1/T线性拟合

表2 1.0 mol·L-1 HCl溶液中MYLE在Al表面吸附的热力学参数

图6 拟合直线

图7 1.0 mol·L-1 HCl中的腐蚀动力学参数随MYLE浓度的变化曲线

图8 20℃时Al在不含和含不同浓度MYLE的1.0 mol·L-1 HCl中的PDP曲线

表3 20℃时Al在不含和含不同浓度MYLE的1.0 mol·L-1 HCl中的动电位极化参数

图9 20℃时Al在不含和含不同浓度MYLE的1.0 mol·L-1 HCl中的EIS和拟合电路图

表4 20℃时Al在不含和含不同浓度MYLE的1.0 mol·L-1 HCl中的EIS参数

图10 Al表面SEM微观形貌和接触角

图11 Al3+浓度和缓蚀率随MYLE浓度的变化曲线

图12 腐蚀机理和缓蚀机理示意图

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