<strong>1, 2, 4-</strong>三唑在模拟调相机转子内冷却水中对铜的缓蚀作用

doi:10.11902/1005.4537.2023.197

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 772-780 CSTR: 32134.14.1005.4537.2023.197 DOI: 10.11902/1005.4537.2023.197

研究报告

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1, 2, 4-三唑在模拟调相机转子内冷却水中对铜的缓蚀作用

冯礼奎¹, 程一杰¹, 宋小宁¹, 于志勇¹, 严梓轩², 张大全²(

)

1.国网浙江省电力公司电力科学研究院杭州 310014
2.上海电力大学环境与化学工程学院上海 201306

Corrosion Inhibition of 1, 2, 4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser

FENG Likui¹, CHENG Yijie¹, SONG Xiaoning¹, YU Zhiyong¹, YAN Zixuan², ZHANG Daquan²(

)

1. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
2. Department of Environment and Chemical Engineering, Shanghai University of Electric Power, Shanghai 201306, China

引用本文:

冯礼奎, 程一杰, 宋小宁, 于志勇, 严梓轩, 张大全. 1, 2, 4-三唑在模拟调相机转子内冷却水中对铜的缓蚀作用[J]. 中国腐蚀与防护学报, 2024, 44(3): 772-780.
Likui FENG, Yijie CHENG, Xiaoning SONG, Zhiyong YU, Zixuan YAN, Daquan ZHANG. Corrosion Inhibition of 1, 2, 4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 772-780.

全文: PDF(5550 KB) HTML

摘要:

选用1.2.4-三唑(TAZ)作为转子冷却水模拟溶液中铜导线的缓蚀剂。通过pH计，电导率仪，溶氧仪检测了使用TAZ前后对转子冷却水模拟溶液的水质变化影响，结果表明TAZ的加入会一定程度上降低溶液的pH值，对电导率和溶氧量的影响不大。采用失重法、动态电位极化法和电化学阻抗谱法研究了TAZ在转子冷却水模拟溶液中对Cu的缓蚀性能。结果表明，随着TAZ浓度的增加，Cu的腐蚀速率降低，腐蚀电流密度减少，其缓蚀效率提高。当TAZ的加入量为10 mmol/L时，其缓蚀效率最高为99.9%(失重法)和92.0%(电化学阻抗法)。采用Langmuir等温线拟合金属表面的吸附过程，证实了TAZ在Cu表面的吸附属于混合吸附。通过理论计算进一步证明了TAZ在铜合金表面具有较好的吸附作用，可以有效地抑制模拟冷却水溶液中Cu腐蚀。在转子冷却水溶液体系中，TAZ对Cu具有较好的缓蚀性能，是一种自发吸附的绿色缓蚀剂。

关键词 ：调相机, 缓蚀, 1, 2, 4-三唑, 铜, 冷却水

Abstract：

The effect of a corrosion inhibitor 1.2.4-Triazole (TAZ) on the water quality of a simulated solution of the rotor cooling water and the corrosion inhibition performance for pure Cu-plate were assessed by means of pH meter, conductivity meter and dissolved oxygen analyzer, as well as measurements such as mass loss, dynamic potentiodynamic polarization curve, and electrochemical impedance spectroscopy. The results show that the addition of TAZ can reduce the pH value to a certain extent, but have little effect on the conductivity and dissolved oxygen content of the solution; With the increase of TAZ concentration, the corrosion rate and the corrosion current density for Cu decrease, i.e., its corrosion inhibition efficiency rises. The highest corrosion inhibition efficiency was 99.9% (loss-in-mass method) and 92.0% (EIS method) when the dose of TAZ was 10 mmol/L. The adsorption process on the metal surface was fitted using Langmuir isotherm, which confirmed that the adsorption of TAZ on the copper surface is a mixed adsorption. The theoretical calculations further proved that TAZ has a better adsorption effect on the surface of Cu, which can effectively inhibit the Cu corrosion in the simulated solution. It is expected that TAZ may have better corrosion inhibition performance for Cu in the rotor cooling waters, which is a kind of green corrosion inhibitor in spontaneous adsorption. Thus, the present results may be a meaningful reference for the application of corrosion inhibitor to protect the hollow-core copper conductors in the rotor cooling water for synchronous condenser.

Key words： synchronous condenser corrosion inhibition 1,2,4-Triazole copper coolant

收稿日期: 2023-06-16 32134.14.1005.4537.2023.197

ZTFLH:

TG174

基金资助:国网浙江省电力有限公司科技项目(5211DS22000L)

通讯作者: 张大全，E-mail：zhangdaquan@shiep.edu.cn，研究方向为金属腐蚀与防护

Corresponding author: ZHANG Daquan, E-mail: zhangdaquan@shiep.edu.cn

作者简介: 冯礼奎，男，1977年生，正高级工程师

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图1 Cu在40℃含不同浓度TAZ的模拟转冷水中静态腐蚀实验数据

图2 Cu在不同浓度TAZ的转冷水溶液浸泡前后的pH值、溶氧量和电导率

图3 Cu在含不同TAZ浓度的模拟内冷水中浸泡实验前后的荧光光谱

图4 Cu在室温含不同浓度TAZ的模拟冷却水中的开路电位和极化曲线

表1 铜在添加不同浓度TAZ的室温模拟冷却水中的极化曲线参数

图5 铜电极在含有不同浓度TAZ的模拟内冷水中的电化学阻抗谱

图6 阻抗数据拟合的等效电路

表2 铜电极在含有不同浓度TAZ的模拟内冷水中的电化学阻抗谱拟合参数

图7 TAZ的Langmuir吸附等温线及相关参数

表3 TAZ在样品表面的成膜厚度及参数

图8 铜在含有不同浓度TAZ的模拟内冷水浸泡后的水接触角

图9 TAZ量子化学计算

图10 Cu表面未吸附TAZ的总态密度和吸附TAZ的投影态密度及体系的差分电荷密度

图11 TAZ吸附的分子动力学模拟

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