根据对于弱极化正弦波动电流扫描滞后圈的研究结果,提出了从小振幅正弦波动电流扫描滞后圈高度测定腐蚀金属电极的极化电阻R_p和界面电容C的方法。这一方法的测量结果不受参考电极至被测电极之间溶液电阻R_(sol)的影响。提出了测量滞后圈高度的0,π增辉法。列出了在模拟电路上纯Fe在不加和添加缓蚀剂的1NH_2SO_4溶液中的测量结果。
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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