T2铜合金和Q235钢在模拟北山地下水环境中的电偶腐蚀行为研究  

Galvanic Corrosion of T2 Cu-alloy and Q235 Steel in Simulated Beishan Groundwater Environment

作　　者：庞洁 刘相局 刘娜珍 侯保荣[1] PANG Jie;LIU Xiangju;LIU Nazhen;HOU Baorong(Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室,青岛266071 [2]中国科学院大学,北京100101

出　　处：《中国腐蚀与防护学报》2024年第6期1435-1442,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52201092);山东省自然科学基金(ZR2022QB128)。

摘　　要：通过电化学测试实验和腐蚀产物分析研究了T2铜合金和Q235钢在北山地下水模拟液(溶质为Na_(2)SO_(4)和NaCl)和不同Cl^(-)浓度溶液中的电偶腐蚀行为。结果表明,T2铜合金在电偶腐蚀中作为阴极受到保护,Q235钢作为阳极腐蚀速率加快;随Cl^(-)浓度增大,电偶电流密度(I_(g))受溶液中溶解氧含量降低、氧扩散系数减小和溶液电导率升高等因素影响存在最大值;随铜合金和碳钢面积比的增大,I_(g)明显增大,表明该条件下电偶腐蚀反应受阴极控制;温度从25℃升高到50℃,I_(g)增大且在Cl^(-)浓度更低时出现最大值;电偶电压(E_(g))受溶解氧的影响随Cl^(-)浓度增大呈负移趋势。该研究结果为北山地下水对镀铜钢储罐电偶腐蚀的影响提供了参考。In this study,the galvanic corrosion behavior of T2 Cu-alloy and Q235 steel in solutions containing Na_(2)SO_(4)and NaCl with various amount of Cl^(-)was investigated by electrochemical tests and corrosion product analysis.The results show that T2 Cu-alloy acts as cathode,while Q235 steel as anode for the galvanic couple,therefore Q235 steel experiences corrosion with accelerating rate;With the increasing of Cl^(-)concentration,the galvanic current density(I_(g))of the galvanic couple exhibits a maximum due to the decrease of dissolved oxygen content in the solution,the decrease of oxygen diffusion coefficient and the increase of solution conductivity etc.;As the area ratio of T2 Cu-alloy to 235 steel increases,I_(g)increases significantly,indicating that the galvanic corrosion reaction is controlled by cathodic reaction;When the temperature increases from 25℃to 50℃,I_(g)increases and a maximum occurs at lower Cl^(-)concentrations;galvanic potential(E_(g))shifted negatively with the increasing Cl^(-)concentration as influenced by dissolved oxygen.The results of this study may provide a reference for understanding the influence of Cl^(-)concentration on galvanic corrosion of Cu-coated carbon steel metal containers.

关 键 词：T2铜合金 Q235钢 Cl~-浓度 电偶腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]