Recent content by Crispin

Many thanks Mapes, So it looks like a typo in the notes, it's a pdf file, and it definitely says "n>>Ba". It should have read "n<<Ba", as then the term "exp(n/Ba)" tends to zero, and it can, therefore, be removed from the overal equation of i = ia-ic = icorr(exp(n/Ba)-exp(-n/Bc)), to...

Yes it does Rusty, & many thanks for the informative explanation, I understand now (it's sort of the difference between pushing or pulling on the same electrochemical property, when the reaction creates the shift it's one sign, when the shift is imposed upon it, it's the opposite sign, makes...

Hi All, I am currently studying a MSc from UMIST in materials & corrosion science. I'm doing this via distance-learning, so kind of "self-tought", with some tutor support via e-mail. I picked physics as my science subject in school, so have little, if no chemistry background, and...

Thanks for your feedback Mark, its called the Butler-Volmer equation, and relates to the current density at the interface of an electrode in solution, where both anodic & cathodic reactions (electrochemical corrosion reactions), are contributing to the current being produced...

Thanks Mark, so I'm not going mad... We are told that the sum of two reactions in equillibirum give the total current (i), and this is given by the equation: i = ia - ic = ix (exp(n/Ba) - exp(-n/Bc)). As the "ic" term is negative, that's why it is subtracted, so as the the 2 negatives...

Hi folks, does this question not make sense, is that why I've not had a reply? Please advise & if needs be I can check the notes & write the info exactly as written. Thanks Crispin

Hi folks, hope somebody can help me understand this one please? Gven an expression i = ia-ic = icorr(exp(n/Ba)-exp(-n/Bc)), we are told that if -n<<Bc then exp(-n/Bc) tends to 0 & the equation becomes i (is approx) = ia = icorr exp(n/Ba). I find that exp(-n/Bc) tends towards 0 if I...