1- Any contamination or irregularity may influence the results, so make sure the sample is correctly prepared, with a clean, even surface and, above all, a good polish.
2- Check that all electrical connections are stable and well made (all three electrodes).
3- Measure under the same environmental conditions (temperature, humidity).
4- . Significant variations between measurements may indicate a problem with sample preparation or equipment. Repeat measurements several times to ensure reproducibility.
5- It is often useful to validate results with other methods (gravimetry, tafel).
By following these precautions, you can improve the reliability and accuracy of your EIS corrosion measurements.
Dear Dr. Smitha Shree Subramaniyam ,
I suggest you to have a look at the following, interesting doduments:
-What is Electrochemical Impedance Spectroscopy (EIS)? by BioLogic
Available at: https://www.biologic.net/topics/what-is-eis/
-Corrosion Testing via Electrochemical Impedance Spectroscopy (EIS) by vlci
Available at: https://vlci.biz/corrosion-testing-via-electrochemical-impedance-eis/
-Precautions for good impedance measurements (EIS) by BioLogic
Available at: https://www.biologic.net/documents/eis-precautions-electrochemistry-battery-application-note-5/
-Basics of Electrochemical Impedance Spectroscopy by Gamry Instruments
Available at: https://www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/
-Using Electrochemical Impedance Spectroscopy (EIS) Method for a Better Understanding of the Corrosion System by zerust
Available at: https://www.zerust.com/blog/2020/11/03/using-electrochemical-impedance-spectroscopy-eis-method-for-a-better-understanding-of-the-corrosion-system/
Enjoy reading and my best regards, Pierluigi Traverso.