Almost all studies reported in the investigation of the potential of a product (organic, inorganic, or plant extract) on the corrosion inhibition don't use the technique EIS (Electrochemical impedance spectroscopy) when they are studying the effect of temperature ( 35 °; 45°; 55 °...) They use only PDP (Potentiodynamic Polarization)!
What is the reason behind using only PDP in this case? Whereas when we work under ambient temperature we use them both ( EIS and PDP)!
In general temperature raises the resistance,scalar parameter, in the PDP.Likewise temperature raises the impedance, vector parameter, in EIS.However,in the case of EIS the measurement of the impedance becomes more complicated to obtain.
Dear Dr. Ayoub Najem ,
the action of an inhibitor system is strongly influenced by the chemical, physical and biological factors in which it operates as it is essential that its intrinsic stability and interaction with the substrate are guaranteed.
Variations of parameters related to the corrosive medium such as eg. temperature, pH, salinity, oxygen content, etc. both the mechanism and the efficiency of the inhibitor can significantly vary.
The EIS technique would probably be too sensitive to the variation of these parameters.
My best regards, Pierluigi Traverso.
Dear Alexander
when you change the temperature during the test, in fact you change other parameters such as oxygen content, resistance of solution and so on. EIS test is sensitive to this parameter and it is possible, you have different equivalent circuit with a change in temperature.
I don't think there is any inherent issue in using EIS at elevated temperatures. The problems such as changes in several variables due to a change in the temperature, will affect PDP and linear polarization results too. It is possible that the EIS results at other temperatures required different circuits to model the data, but if you are looking mainly for polarization resistance from EIS, to compare with the predictions of PDP and LP, you should be able to use EIS at several temperatures
Hello,
As far as I understand, the temperature will affect both experiments. I also don't think that there is any problem using EIS. However, there is a possibility to have noises at lower frequencies while running EIS at elevated temperatures. That could be one of the reasons to avoid using EIS.
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