Assessing the Impact of AC, DC, and Hybrid AC/DC Stray Currents on Cathodic Protection Efficiency

Ahlem Chahinez  Kadri; M'hamed OUADAH; Abderrahmane  Younes; Sofiane  Chabane

doi:10.62638/ZasMat1418

Authors

Ahlem Chahinez Kadri Ecole Nationale Supérieure des Technologies Avancées, Place des Martyrs, Algeria Author https://orcid.org/0009-0004-3703-923X
M'hamed OUADAH Ecole Nationale Supérieure des Technologies Avancées, Place des Martyrs, Algeria Author https://orcid.org/0000-0003-3444-0787
Abderrahmane Younes Research Center in Industrial Technologies (CRTI), Cheraga, Algiers, Algeria Author https://orcid.org/0000-0003-2446-1568
Sofiane Chabane CIMA+, Montreal, Quebec, Canada Author https://orcid.org/0000-0003-3720-1239

DOI:

https://doi.org/10.62638/ZasMat1418

Abstract

Ensuring the efficiency of cathodic protection (CP) is critical for maintaining the integrity of buried pipelines. Stray currents, particularly those originating from high-voltage power lines, can interfere with CP systems, leading to accelerated corrosion. This study investigates the effects of alternating current (AC), direct current (DC), and hybrid AC/DC stray currents on CP performance. Electrochemical measurements and finite element modeling (FEM) were employed to evaluate the impact of these currents on X70 steel pipelines. Results indicate that AC stray currents reduce CP effectiveness by shifting protection potentials to more electropositive values, increasing corrosion risk. DC stray currents affect CP voltage settings, while hybrid AC/DC interference exacerbates both effects. Findings provide insights into pipeline protection strategies, particularly in environments with mixed AC/DC stray currents.

Keywords:

AC stray current, DC stray current , hybrid AC/DC interference , corrosion, cathodic protection, finite element method

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