苯并三唑对碳钢/铜合金电偶腐蚀行为的影响  

Effect of 1H-benzotriazole on Galvanic Corrosion Behavior of Carbon Steel/Copper Alloy

作　　者：王琳 周漪[2] 李传鹏 刘杰 WANG Lin;ZHOU Yi;LI Chuan-peng;LIU Jie(Aviation Foundation College,Naval Aviation University,Yantai 264001,China;Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute,Chongqing 400039,China;School of Chemistry and Chemical Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]海军航空大学航空基础学院,山东烟台264001 [2]西南技术工程研究所国防科技工业自然环境试验研究中心,重庆400039 [3]烟台大学化学化工学院,山东烟台264005

出　　处：《表面技术》2022年第2期259-267,共9页Surface Technology

基　　金：国家自然科学基金(51971192,51901096);烟台市科技计划(2019XDHZ086)。

摘　　要：目的研究NaCl溶液中苯并三唑(BTA)对碳钢/铜合金电偶腐蚀行为的影响。方法使用丝束电极(WBE)技术和电化学阻抗谱(EIS)技术研究在未添加和添加BTA的NaCl溶液中,丝束电极表面的电位分布、电流密度分布和电化学阻抗谱演化,同时对比分析碳钢区域与铜合金区域的阻抗谱特征。结果在未添加BTA的条件下浸泡72 h时,碳钢表面阳极电流区域所占比例为80%,且电流密度的分布区间较窄。在添加BTA的条件下浸泡72 h后,碳钢表面的阳极面积占比为86%,其电流密度的分布区间明显变宽。铜合金在添加缓蚀剂条件下的阻抗值大于未添加缓蚀剂条件下的阻抗值;碳钢在添加和未添加BTA溶液中的阻抗均较小。结论铜合金和碳钢在NaCl溶液中电耦合时,BTA的添加会增大碳钢的电化学不均匀性。在铜合金和碳钢的电偶腐蚀过程中,BTA的添加仅对铜合金起到了良好的缓蚀作用,对碳钢的缓蚀作用并不明显。与碳钢/铜合金偶对相比,铜合金在含有BTA的溶液中单独浸泡时,表面形成的Cu-BTA分子膜更稳定且缓蚀效果更好。随着浸泡时间的延长,WBE在添加BTA的NaCl溶液中的电极反应速率逐渐增加,而在未添加BTA的条件下WBE的电极反应速率的变化恰好相反。The work aims to study the effect of 1H-benzotriazole(BTA)in NaCl solution on the galvanic corrosion behavior of carbon steel/copper alloy.The potential distribution,current density distribution and EIS evolution of the WBE in NaCl solution with and without BTA were studied by the wire beam electrode(WBE)and electrochemical impedance spectroscopy(EIS)techniques.Meanwhile,the EIS characteristics of the carbon steel area and the copper alloy area were compared and analyzed.After immersion for 72 h under the condition without BTA,the anodic current area on the carbon steel surface accounted for 80%,and the range of current density distribution was narrow.After immersion for 72 h under the condition with BTA,the proportion of anode area on the surface of carbon steel was 86%,and the range of current density distribution was significantly enlarged.The impedance value of the copper alloy under the condition with corrosion inhibitor was greater than that of the copper alloy under the condition without corrosion inhibitor.However,the impedance value of carbon steel in the solution with and without BTA was relatively small.When copper alloy and carbon steel are electrically coupled in NaCl solution,the electrochemical inhomogeneity of carbon steel is increased due to corrosion inhibition effect of BTA.In the galvanic corrosion process of carbon steel/copper alloy,BTA only plays a good corrosion inhibition effect on the copper alloy,and the corrosion inhibition effect of BTA on carbon steel is not obvious.Compared with the carbon steel/copper alloy couple,when the copper alloy is individually immersed in a solution containing BTA,the Cu-BTA molecular film formed on the surface is more stable and the corrosion inhibition effect is better.With the extension of the immersion time,the electrode reaction rates of the WBE in the NaCl solution added with BTA are gradually increased,while the changes of the electrode reaction rates of the WBE under the conditions without BTA are exactly the opposite.

关 键 词：电偶腐蚀 碳钢 铜合金 缓蚀作用 丝束电极 电化学阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理]