How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
(OP)
Hello,
I was running a few linear polarization corrosion experiments on a titanium alloy in NaCl. Long story short, I got a funky - looking Tafel plot; the right side is almost like a corner. The program I am using (EC-Lab) extrapolates the slopes automatically but I still have to select which area it should extrapolate. Because of this corner-like anodic slope, my Ba value is very high.
Does anyone have any tips on what the correct way to extrapolate the slopes on a Tafel plot is? Sources would be greatly appreciated.
Thank you,
Igor
I was running a few linear polarization corrosion experiments on a titanium alloy in NaCl. Long story short, I got a funky - looking Tafel plot; the right side is almost like a corner. The program I am using (EC-Lab) extrapolates the slopes automatically but I still have to select which area it should extrapolate. Because of this corner-like anodic slope, my Ba value is very high.
Does anyone have any tips on what the correct way to extrapolate the slopes on a Tafel plot is? Sources would be greatly appreciated.
Thank you,
Igor





RE: How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
RE: How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
Also, I'm not sure how to upload a picture of the graph - from what I've seen you can only URL a picture that's already up on the internet somewhere.
My main question is the extrapolation of the Tafel curve and how to properly do it.
Thanks!
RE: How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
http://www.energy-cie.ro/archives/2010/n1-1-14.pdf
RE: How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: How do you correctly extrapolate slopes on a Tafel (log(I) /mA vs E /V) curve?