We always focus on the inhibition efficiency of the inhibitor molecules but never discuss about the stability of the adsorbent molecules. Can we investigate the stability of the inhibitor, adsorbed on the steel?
Dear Haldhar,
I think you can investigate the inhibitor behavior (and also its stability and obtain good results) using electrochemical techniques (eg EIS, etc.) and morphological and chemical surface analysis (eg AFM, XPS, FT-IR, SEM, etc. ) carried out on samples after exposure to free corrosion, for different times of immersion, in the corrosive environment of reference.
Best Regards, PT
@Pierluigi Traverso thank you for the answer, the described analysis methods can help out to investigate the morphology of the surface but these are fail to provide the specific time period such as; how much time it will be adsorbed on the surface.
Dear Haldhar,
using electrochemical and / or surface analysis methods on different samples, changing the different experimental conditions (free corrosion exposure time, concentration and type inhibitor, etc.) you should have some information regarding the adsorption, the distribution, the start time - or end-activity of the power of inhibition, and so on.
A comparison approach with samples without the presence of inhibitor would also allow to have a "standard" of reference regarding the behaviour of your substrate.
Best regards, PT
Dear Rajesh
Your question is a little bit ambiguous. Anyway, Using some tests such as EIS, LPR and Wheel test (NACE 1D 182) would be helpful for film forming evaluation. Wheel Test Method Used for Evaluation of Film-Persistent Corrosion Inhibitors for Oilfield Applications in different media and for about 72 hours. as well as this. There is a corrosion device measurement that you can see corrosion rate ( online ) and pitting tendency during specific time for example 10 days, then calculate corrosion rate (mpy).
Regards
I think it is possible to study the stability of the adsorbed inhibitor on the steel as a function of immersion time. we can perform it using morphological and chemical surface analysis of the surface coupled to the energy dispersive X-ray (EDX).
Regards
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