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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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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. 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.
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