The image below is a EIS plot of my coating on steel substrate. According to the literature survey, the range of applied frequency is between 100 KHz to 10 mHz.
Shall I go farther and apply a lower frequency to obtain a complete shape of my curve?
You can start your analysis from low until high frequency; it will allow you obtain a complete study of the process. One hour is a short immersion time, usually is employed time higher than one hour. Therefore I recommend you at least 8 hours.
The frequency you have used is the generally accepted trend. Lower the frequency you go higher the time it will take to get the data, Maybe around 3 hours if you go to .001Hz. So .01 low frequency should be enough. Even 0.1 Hz can be seen in literature. The concept is to go to 0Hz, or up to the DC limit that can provide you the DC resistance and hence protective/barrier nature of your coating. However, .01 Hz can be considered to be 0Hz (assumption) for such purpose where time is important.
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