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yaingy

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[交流] 文献EIS谱图的分析没看懂，请大家赐教啊

文献：The aspolished samples showed a dramatic decrease of the impedance in the capacitive region, which is characteristic for the pitting process on steel. The polarization resistance of as-polished sample (Rp0) is 2.8 Ω. Subtracting this value from the Rp of Ni–P (RpNi–P−Rp0) results in 1.2 Ω. Increasing magnitude of the resistance of the barrier layer indicates better corrosion performance. In addition, the phase angle θ tended toward zero at low frequencies indicating that the resistance of the barrier layer was being approached. An additional maximum of θ was observed for Ni–P coated samples, as evident in Fig. 1B. These changes of the spectra at very low frequencies indicate the occurrence of pitting.
1 请问capacitive region的范围是什么？
2 为什么要RpNi–P−Rp0 ？polarization resistance 是由极化曲线得到还是阻抗谱得到？Increasing magnitude of the resistance of the barrier layer indicates better corrosion performance这句话的原理是什么？
3 为什么在低频处θ接近零时候indicating that the resistance of the barrier layer was being approached？
4 An additional maximum of θ was observed for Ni–P coated samples, as evident in Fig. 1B. These changes of the spectra at very low frequencies indicate the occurrence of pitting.这个是怎么得出的，可以详细说明一下吗？
各位赐教啦！谢谢！问题有点多，呵呵

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