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  

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

作　　者：冯礼奎 程一杰 宋小宁 于志勇 严梓轩 张大全 FENG Likui;CHENG Yijie;SONG Xiaoning;YU Zhiyong;YAN Zixuan;ZHANG Daquan(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;Department of Environment and Chemical Engineering,Shanghai University of Electric Power,Shanghai 201306,China)

机构地区：[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

出　　处：《中国腐蚀与防护学报》2024年第3期772-780,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国网浙江省电力有限公司科技项目(5211DS22000L)。

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。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 sur-face 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.

关 键 词：调相机 缓蚀 1 2 4-三唑 铜 冷却水 

分 类 号：TG174[金属学及工艺—金属表面处理]