Previous works showed that AC can affect corrosion overpotential of corroding metals. In order to understand this experimental evidence, galvanostatic polarization tests on carbon steel, zinc and copper in 1 M solution of their ions were performed at AC current densities of 0, 30, 100, 300, 500 and 1,000 A/m2. The influence of AC on kinetics parameters such as Tafel slope and exchange current densities was therefore evaluated. The results confirmed that models based on a pure faradaic effect are not sufficient to fully describe the effects of AC on corrosion if the processes occurring at the interface are not completely reversible. In that case, the metal-solution interface could be altered by the AC signal affecting the corrosion kinetics.

Subject
Equilibrium potential, Ions, Corrosion kinetics, Overpotential, Polarization curves, Interfaces, Metals, Carbon steel, Copper, Zinc, Polarization, Tafel slope, Exchange current density
Keywords:
AC interference, Tafel slope, corrosion kinetics, corrosion mechanism
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2005
Association for Materials Protection and Performance (AMPP)
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