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Abstract For the case where the electrode impedance may be represented by a polarization resistance Rp connected in parallel with an interracial capacitance C and where the electrode system is perturbed by a small amplitude sine wave alternating current9 the following equations can be derived: 2i_0/h_0ω=1/R_p~2C+C·ω~2 and 2i_0/h_0λ=πC+λ~2/πR_p~2C In these equations, h_0 is the difference between the polarization values at τ=π/ωand at τ=0, where lr represents time; ω is the angular frequency; λ. is the half length of the period of the sine wave; i, is the amplitude of the sine wave current. Rp and C may be calculated from the values of b and m which are determined by the least square method. To measure the values of h_0, a device which can impose a pulse on the oscillotron at 0-and π-phase is set up. By this device,the fluorescence of the oseillotron is strengthened at τ= 0 and τ=π/ω, and the value of h_0 may be determined from the distance between the two brightening, points on the fluorescent screen of oscilloscope. The impedances of iron electrode dipped in 1 NH_2SO_4 solutions with and without inhibitor have been measured.
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Received: 25 February 1982
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Cite this article:
Cao Chunan Yu Huiyi Dong Shoushan and Hou Wentao (Changchun Institute of Applied Chemistry; Chinese Academy of Sciences). A METHOD FOR MEASURING ELECTRODE IMPEDANCE BY SINE WAVE GALVANODYNAMIC PERTURBATION. J Chin Soc Corr Pro, 1982, 2(1): 1-10.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1982/V2/I1/1
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