方波阴阳极交替极化对Q235钢腐蚀行为的影响  

Effect of Cathode/Anode Alternating Polarization of Square-Wave on the Corrosion Behavior of Q235 Steel

作　　者：杨海洋[1,2] 张庆普 杨朝晖 王佳 杜翠薇[3] 张启富 YANG Hai-yang;ZHANG Qing-pu;YANG Zhao-hui;WANG Jia;DU Cui-wei;ZHANG Qi-fu(Central Iron and Steel Research Institute,Beijing 100081,China;Qingdao NCS Testing and Corrosion Protection Technology Co.,Ltd.,Qingdao 266071,China;Institute of Advanced Material and Technology,University of Science and Technology Beijing,Beijing 100083,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;China Iron and Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]钢铁研究总院,北京100081 [2]青岛钢研纳克检测防护技术有限公司,山东青岛266071 [3]北京科技大学新材料技术研究院,北京100083 [4]中国海洋大学化学化工学院,山东青岛266100 [5]中国钢研科技集团有限公司,北京100081

出　　处：《材料保护》2021年第9期14-19,共6页Materials Protection

基　　金：国家自然科学基金(51771057)资助。

摘　　要：为研究阴阳极交替极化对Q235碳钢腐蚀的影响,通过方波阴阳极交替极化进行了4种状态下(±50 mV、±100 mV、±150 mV、±200 mV)的腐蚀行为研究,获得了腐蚀失重和电化学测试结果。结果表明,阴阳极交替极化会加速Q235钢在海水中的腐蚀,且阴阳极交替极化的幅度越大其加速作用越强。对Q235钢施加阴阳极交替极化不同次数后,+50 mV、+100 mV和+150 mV阳极极化时,电流密度呈现“瞬间升高-迅速降低-500 s后稳定”的变化过程;而施加+200 mV阳极极化时,电流密度呈现“瞬间升高-迅速降低-持续升高”的变化过程。交流阻抗结果显示,Q235钢在经历阴阳极交替极化后的电荷转移电阻R_(ct)值小于全浸条件,且交替极化的幅度越大R_(ct)值越小。极化曲线结果显示,当阴阳极交替极化幅度超过±100 mV后,Q235钢腐蚀的阴极过程显著加快。For studying the effect of cathode/anode alternating polarization on the corrosion of Q235 carbon steel,the corrosion behaviors under four states(±50 mV,±100 mV,±150 mV and±200 mV)were studied by square-wave cathode/anode alternating polarization,and the results of weight loss and electrochemical tests were obtained.Results showed that the cathode/anode alternating polarization would accelerate the corrosion of Q235 steel in seawater,and the greater the amplitude of the cathode/anode alternating polarization,the stronger the acceleration effect.After the cathode/anode alternating polarization for different times to Q235 steel,the current density presented the process of“momentary rise-rapid decrease-stabilization after 500 s”when+50 mV,+100 mV and+150 mV anode polarization were applied.In comparison,the current density showed the process of“momentary rise-rapid decrease-continuously increase”when+200 mV anode polarization was applied.Moreover,the AC impedance results indicated that the R_(ct)(charge transfer resistance)value of Q235 steel after undergoing cathode/anode alternating polarization was less than that of the immersion condition,and the greater the amplitude of the alternate polarization,the smaller the R_(ct) value.The result of the polarization curve showed that when the cathode/anode alternating polarization exceeded more than±100 mV,the cathode process of Q235 steel corrosion accelerated significantly.

关 键 词：方波 阴阳极交替 极化 Q235 腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]