电化学频率调制技术在Q235钢/NaCl腐蚀体系中的应用

doi:10.11902/1005.4537.2014.009

中国腐蚀与防护学报

2014, Vol. 34

Issue (5): 445-450 DOI: 10.11902/1005.4537.2014.009

本期目录 | 过刊浏览

电化学频率调制技术在Q235钢/NaCl腐蚀体系中的应用

周年光, 查方林(

), 冯兵, 何铁祥

湖南省电力公司科学研究院长沙 410007

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

ZHOU Nianguang, ZHA Fanglin(

), FENG Bing, HE Tiexiang

Hunan Electric Power Corporation Research Institute, Changsha 410007, China

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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。

关键词 ：电化学频率调制, 基频, 校验因子, 腐蚀速率, 极化电阻

Abstract：

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. R_p 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.

Key words： EFM base frequency causality factor corrosion rate polarization resistance

ZTFLH:

TQ150.1

基金资助:国家电网科技项目 (KG12K16004)和湖南省电力公司科技项目(5116AA110005)资助

作者简介: null

周年光，男，1970年生，博士，研究方向为腐蚀与防护技术

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引用本文:

周年光, 查方林, 冯兵, 何铁祥. 电化学频率调制技术在Q235钢/NaCl腐蚀体系中的应用[J]. 中国腐蚀与防护学报, 2014, 34(5): 445-450.
Nianguang ZHOU, Fanglin ZHA, Bing FENG, Tiexiang HE. Application of Electrochemical Frequency Modulation for Study of Q235 Steel Corrosion in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 445-450.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.009 或 https://www.jcscp.org/CN/Y2014/V34/I5/445

图1 Q235钢在0.5 mol/L NaCl溶液中0.01和0.1 Hz基频下的EFM扫描结果

图2 Q235钢在0.5 mol/L NaCl溶液中腐蚀不同时间的电化学阻抗结果

图3 Q235钢腐蚀阻抗等效电路图

表1 Q235钢阻抗主要参数拟合结果

图4 Q235钢腐蚀不同周期线性极化曲线

图5 EIS, LPD和EFM方法测量的Rp随时间变化的曲线

图6 Q235钢腐蚀不同周期的EFM频谱图

表2 Q235钢腐蚀不同周期的EFM测量结果

图7 EFM测量的腐蚀速率线性拟合结果

图8 EIS和LPD测量的腐蚀速率线性拟合结果

图9 EFM, 失重法, EIS和LPD法测量腐蚀速率对比结果

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