Anodic transient is a form of stray current induced potential excursion that is believed to affect buried pipeline cathodic protection (CP) systems by shifting pipeline potential away from safe CP potential levels. However the actual effect of anodic transients on pipeline corrosion has not been sufficiently quantified due to the lack of direct and reliable evidences. In this work a novel research methodology has been employed to quantify the dynamic effects of anodic transients on CP and corrosion by means of an electrochemically integrated multi-electrode array, often referred to as the wire beam electrode (WBE). It is shown that anodic transients do not necessarily cause pipeline corrosion, as long as their amplitude and duration are below critical values. These critical values are termed the critical anodic transient duration and amplitude, and are explained as the incubation period and the potential required for passivity to break down locally.

Subject
Steel surfaces, Anode potential, Electrochemical cells, Cathodic protection, Probes, Steel coupons, Anodic current, Steel, Localized corrosion, Electrodes, Soil, Corrosion potential, Passivity
Keywords:
Soil corrosion, Pipeline, Cathodic protection, Stray current corrosion, Electrochemical monitoring, The wire beam electrode
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2018
Association for Materials Protection and Performance (AMPP)
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