电化学频率调制技术在Q235钢/NaCl腐蚀体系中的应用  

Application of Electrochemical Frequency Modulation for Study of Q235 Steel Corrosion in NaCl Solution

作　　者：周年光[1] 查方林[1] 冯兵[1] 何铁祥[1] 

机构地区：[1]湖南省电力公司科学研究院,长沙410007

出　　处：《中国腐蚀与防护学报》2014年第5期445-450,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家电网科技项目(KG12K16004);湖南省电力公司科技项目(5116AA110005)资助

摘　　要：分析了主要测量参数对电化学频率调制技术(EFM)测量结果的影响;探讨了校验因子偏离理论值的原因;通过EIS分析以及与线性极化法和失重法的对比实验,研究了在Q235钢/NaCl体系中EFM测量结果的准确性。结果表明:EFM测量基频越高,测量结果误差越大,在Q235钢/NaCl体系中应选取0.01 Hz的基频;校验因子CF3对测量性的判断不可靠,宜以CF2为校验标准;EFM方法测量的极化阻抗值准确性强于线性极化;与失重法的对比实验表明EFM是一种快速准确的腐蚀速率测量方法。The influence of main parameters on the measurement results of electrochemical frequency modulation （EFM） and the deviation of causality factors from their theoretical values were analyzed. Then the accuracy of corrosion rate measured by EFM for Q235 steel in NaCl solution was comparatively checked by means of measurements with EIS, linear-potentiodynamic technique and weight-loss method. The results show that great error will be introduced when the base frequency is too high; 0.01 Hz is a proper base frequency for Q235 steel in NaCl solution. Causality factor CF2 is much reliable than CF3 for checking the accuracy of EFM measurement. Rp value measured by EFM is much accurate than that by linear-potentiodynamic technique; in comparison with weight-loss method, EFM is a rapid and accurate method for measuring corrosion rate.

关 键 词：电化学频率调制 基频 校验因子 腐蚀速率 极化电阻 

分 类 号：TQ150.1[化学工程—电化学工业]