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J Chin Soc Corr Pro  1986, Vol. 6 Issue (1): 33-41    DOI:
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ELECTRODE IMPEDANCE MEASUREMENT BY TIME DOMAIN METHOD Ⅱ-EXPERIMENTAL RESULTS AND DISCUSSION
Hu Xiche Yao Luan Lu Zhongzht and Chen Yongyan (Wuhan University)
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Abstract  The method described in part I has been used to determine AC Impedance of the dummy cells and electro-chemical systems. The measured results pretty well agree with those obtained by theoritical calculations.The complex plane plot for Pt/Fe ( CN)_6~(3-)/Fe (CN)_6~(4-) system appears as a straight line with unit slope. Both Z′~ω~(-1/2) and Z" ~ω~(-1/2) relations are linear, verifing that the electrode process is mass-transfer-controlled. The obtained averaging diffusion coefficient of Fe ( CN)_6~(?) and Fe ( CN)_6~(4-) is 7.24 ×10~(-6)cm~2/s.The impedance plane plots for Fe/H_2SO_4 are semicirclar showing that the electrochemical reaction is charge-transfer-controlled. The charge transfer impedance R_r increases with decrease in concentration of H_2SO_4. When corrosion inhibitor IN7 is added to 1 N H_2SO_4/Fe system, the charge transfer impedance apparently increases from 85.3Ω·cm~2 to 286Ω·cm~2.
Received:  25 February 1986     
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Hu Xiche Yao Luan Lu Zhongzht and Chen Yongyan (Wuhan University). ELECTRODE IMPEDANCE MEASUREMENT BY TIME DOMAIN METHOD Ⅱ-EXPERIMENTAL RESULTS AND DISCUSSION. J Chin Soc Corr Pro, 1986, 6(1): 33-41.

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https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y1986/V6/I1/33

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