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Journal of Chinese Society for Corrosion and protection  2014, Vol. 34 Issue (5): 445-450    DOI: 10.11902/1005.4537.2014.009
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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.

Key words:  EFM      base frequency      causality factor      corrosion rate      polarization resistance     
ZTFLH:  TQ150.1  

Cite this article: 

ZHOU Nianguang, ZHA Fanglin, FENG Bing, HE Tiexiang. 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.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2014.009     OR     https://www.jcscp.org/EN/Y2014/V34/I5/445

Fig.1  EFM spectrograms of Q235 steel in 0.5 mol/L NaCl solution at 0.01 and 0.1 Hz base frequency
Fig 2  Bode (a) and Nyquist (b) diagrams of Q235 steel in 0.5 mol/L NaCl solution
Fig.3  Equivalent circuit of Q235 in 0.5mol/L NaCl solution
Time
h
R0
Ωcm2
Rf
Ωcm2
Qdl
Ssncm-2
Rt
Ωcm2
fb
Hz
17 2.11 34 4.28×10-4 1770 0.21
163 2.57 24 5.67×10-4 2342 0.12
353 2.09 72 5.56×10-4 2211 0.13
Table 1  Main impedance parameters of Q235 steel in 0.5 mol/L Nacl solution
Fig.4  Linear polarization curves of Q235 steel at different corrosion time
Fig.5  Comparison of Rp curves measured by EIS, LPD and EMF
Fig.6  EFM spectrograms of Q235 steel corroded for 17 h (a), 163 h (b) and 353 h (c)
Time
h
icorr
μAcm-2
ba bc Rp
Ω
CF2 CF3
mVdec-1
17 8.24 31.09 41.61 2160 1.97 1.20
163 8.60 33.49 45.40 2241 2.13 2.18
353 6.24 24.05 31.45 2184 1.99 3.80
Table 2  EFM results of Q235 steel corroded for different time
Fig.7  Linear fitting of corrosion rate curve measured by EFM
Fig.8  Linear fitting of corrosion rate curves measured by EIS and LPD
Fig.9  Comparison of Q235 steel's corrosion rate measured by EFM, weight-loss method, EIS and LPD
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