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Calibration Curves for rapid monitoring of corrosion rates
Author(s) -
Ammar I. A.,
Darwish S.,
Khalil M. W.
Publication year - 1982
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19820130904
Subject(s) - tafel equation , corrosion , cathodic protection , polarization (electrochemistry) , calibration curve , electrode , current density , anode , calibration , chemistry , analytical chemistry (journal) , materials science , thermodynamics , metallurgy , electrochemistry , physics , mathematics , detection limit , statistics , chromatography , quantum mechanics
The linear polarization method of corrosion rate determination has been investigated on the basis of the equation of Stern and Geary . It has been demonstrated that use of an average value for the parameter B does not lead to accurate results. A procedure has been suggested for rapid monitoring and more accurate measurements of corrosion rates, and this is based on the calculation of B from independent measurements of the electrode‐kinetic parameters of the corrosion system under investigation. Values of B have been calculated for a wide range of Tafel slopes for the case when both cathodic and anodic partial reactions are controlled by charge transfer. Using the correct value of B, potential/corrosion current density curves are constructed for various polarizing current densities. It has been shown that these calibration curves are very helpful in the rapid monitoring of corrosion rate using the linear polarization method at constant current density with a three‐electrode arrangement.