File Exchange > DataHandling >    Tafel Extrapolation

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Tafel Extr...on.opx
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Estimate Tafel Extrapolation using tangent lines on a data plot.

Screen Shot and Video:

This app can be used to estimate the Tafel Extrapolation, and output the corresponding values (e.g. anodic/cathodic curve function, corrosion potential and current, anodic/cathodic curve's slope and angle).

Download the file "Tafel Extrapolation.opx". Then drag-and-drop the file onto the Origin workspace.


  1. With a graph window active, select the "Tafel Extrapolation" app icon from the Apps panel. A dialog will open. The dialog provides options for the app gadget.
  2. Click the Help button in the top right corner of the dialog to open the help file. The file includes an explanation of dialog box settings, plus an example.


v1.1: fixed failed to open issue in Origin 2018
v1.2: support for Icorr,a and Icorr,c

Reviews and Comments:
04/10/2021HKheirabadiIt was perfect. Please add polarization resistance measurement.
Users should note that in order for this App to work one should have his/her current density in the logarithmic format ( Like -7, -6 , -5 , -4 , ... NOT 1e-7, 1e-6, 1e-5, ...)


04/22/2020claudiagmI have the same problem as Fernando. I am using OriginPro 2020 and it fits curves instead of tangent lines, so the results are too different. How can I change this? Thanks

03/12/2020OriginLabHi forooza2,
Are you using Origin 2016 or later versions? Could you pleaes tell what problem you ran into?

03/10/2020forooza2Doesn't work!

04/24/2019OriginLabHi ferdinando, could you send the data to our technical service? And then we can see what help to do for you with your data.

04/19/! I ploted my linear polarization but whwn I want to use Tafel Extrapolation not show linear line but curves.

03/25/2019iCalculatevery useful !!!!!!

12/23/201800114899can't download

11/28/2018Mory6753it seems useful. i should test it for more data and graphs. thank you origin