The effect of potential on the calculated exchange current of an active iron electrode

It is shown that if the slopes of semilogarithmic straight lines of the act ive anodic dissolution (or cathodic deposition) of a metal depend on the ra te or direction of recording, then writing them in Tafel's form with the va riable a and b constants is an electrochemical nonsense, because the seemin g changes of b conceal undeciphered changes in the imaginary a constant, wh ich is typically the obvious actual function of the potential that bears th e main information on the peculiarities of the process.