Greetings. My question is quite simple. Previously, when I'm working in analyzing the coated sample of steel with a coating made of plant extract. I usually got a polarization curve showing both side of anodic and cathodic site. But, several days ago when I try to do the same analysis using the same method on a coated sample, I only got a one sided polarization curve. Can anyone tell me why it does not show the same result as previous analysis?
Im working with a coating made up of plant extract, so I'm expecting for it to exhibit a mixed inhibitor polarization curve.
In the figure below is the typical type of curve I usually get. But this time I only got the cathodic site only
I may suppose that OCP was outside the potential interval used to record the polarisation curve (at a more positive value).Verify the data table to see if the anodic current values were recorded.
Dear Wan
In the second attempt, did you run with a new sample and new solution or new sample with the same solution used in the first run?
Best regards
Just expand the sweep range to cover a wider range of of potential. This might happen because the OCP is out of the used range.
My best regards
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