AC-induced corrosion continues to be a controversial subject and a full agreement on influencing parameters and mechanism has not yet been achieved. The influence of AC-induced interference on the localized corrosion resistance of passive metals is discussed on the basis of laboratory test results. Tests were performed on stainless steel with different chemical composition (PREN 18 and 25) in soil-simulating solution and on carbon steel in alkaline solution (under cathodic protection of carbon steel, the local pH at the soil-steel interface is higher than 10, so carbon steel is in passive condition). Potentiodynamic tests were also carried out to analyse the effects of AC stationary interference on passivity current density. Applied AC was in the range of 10 A/m2 to 100 A/m2. Results allow to evaluate the effect of AC on: time-to-corrosion, AC critical current density and corrosion morphology.

Subject
Transpassivation, Voltage, Alkaline solutions, Free corrosion potential, Density, Current densities, Metals, Passivation, AC interference, Carbon steel, Corrosion resistance, Stainless steel, Corrosion potential
Keywords:
AC-induced corrosion, AC-interference, passive metals, passivity current density
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2011
Association for Materials Protection and Performance (AMPP)
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