The presence of AC may cause serious damage on metallic structures even when cathodic protection is applied and off-potential matches −0.85 V CSE criterion. Uncertainties still exist on protection potential interval and on protection current density to reach an acceptable protection when AC interference is present. In order to investigate these aspects, weight loss tests on cathodically protected carbon steel specimens were performed in laboratory in soil simulated conditions in presence of AC, with densities ranged from 10 to about 500 A/m2, to assess cathodic protection criteria as AC density threshold and protection potential.

Subject
Cathodic protection, Corrosion rate, Cathodic potential, Density, Overprotection, Current densities, Cathodic current density, Risk management, AC interference, Carbon steel, Corrosion protection, Protection potential, Soil
Keywords:
AC interference, cathodic protection, true potential, monitoring
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2008
Association for Materials Protection and Performance (AMPP)
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