Optimizing AC Mitigation with BADGERCORD™ Zinc Ribbon

Alternating Current (AC) interference on buried pipelines and other structures is a critical issue that can accelerate corrosion and pose operational hazards. Mitigating AC interference using zinc ribbon anodes is a well-established method in cathodic protection. In this paper, we explore the impact of ribbon cross-sectional shapes on current distribution, using the laws of physics to explain why BADGERCORD™ stands out as the superior option.

Electrical Properties and Current Distribution

The way electric currents flow around a conductor is governed by fundamental physical laws, particularly Ohm’s Law and Gauss’s Law. These laws dictate that the current flows from areas of high potential to low potential, and the shape of the conductor plays a critical role in the way this current is distributed.

• Ohm’s Law governs the relationship between voltage, current, and resistance. In the context of zinc ribbon anodes, minimizing resistance is crucial for ensuring efficient current flow through the ribbon and out into the surrounding environment.

• Gauss’s Law for Electricity explains how electric fields radiate outward from a charged surface. The shape of the conductor determines how uniformly the electric field - and thus the current - spreads from the surface of the zinc ribbon into the surrounding soil or environment.

Diamond-Shaped Cross Section: The diamond shape ensures that current radiates outward symmetrically from the surface of the ribbon. With more uniform surface exposure to the surrounding environment, the current is distributed more evenly in all directions. This helps ensure that the anode provides consistent protection regardless of how the ribbon is oriented relative to the structure it is protecting.

A diamond shape offers more uniform field lines, which are less susceptible to concentration at specific points, resulting in a more homogeneous current distribution. This is critical for protecting structures like pipelines, where corrosion risks may occur at any angle or location along the asset’s length. The cross-section provides a larger distributed surface area in both radial and axial directions, reducing the risk of "hot spots" where current density could become excessively high and cause localized over-protection or depletion of the anode material.

Rectangular Cross Sections: Products with extreme rectangular shapes provide a large surface area but are limited by their orientation. Gauss’s Law indicates that a flat, rectangular shape may result in electric field concentration on the flat sides of the anode, creating uneven current distribution. When laid in specific orientations (such as flat against the structure being protected), the current primarily radiates from the flat surface, leaving the edges less effective. This may lead to uneven protection and potentially create under-protected zones, especially when current needs to travel in multiple directions. The rectangular shape tends to create a bias in the direction of current flow, which could lead to gaps in protection if the orientation of the anode does not perfectly align with the required current distribution patterns. This makes the installation orientation of rectangular shapes far more critical, as improper alignment could reduce the effectiveness of the AC mitigation.

Application Flexibility

BADGERCORD’s diamond-shaped cross-section offers superior flexibility during installation. Since the current radiates evenly regardless of the ribbon’s orientation, it can be laid in a variety of configurations without compromising performance. This is particularly useful for installations in rough or uneven terrain, where precise orientation may be difficult or where the anode needs to curve or bend around obstacles.

In contrast, extreme rectangular shapes require careful alignment to ensure the broad surface is correctly oriented to the structure being protected. This can be particularly challenging in real-world environments, such as rocky soils or irregular pipelines, where perfect alignment is difficult to achieve and maintain over time.

Mechanical Reliability

BADGERCORD’s rounded and flexible nature also reduces the risk of mechanical failure during installation. Rigid or flat zinc ribbons may experience issues such as bending, cracking, or improper surface contact with the soil. The diamond shape of BADGERCORD not only offers electrical benefits but also allows for more mechanical flexibility, reducing the likelihood of stress points that could compromise the effectiveness of the zinc ribbon anode over time.

In evaluating zinc ribbon products for AC mitigation, BADGERCORD’s diamond-shaped cross-section clearly offers superior current distribution, installation flexibility, and mechanical reliability. The principles of Ohm’s Law and Gauss’s Law demonstrate that BADGERCORD’s design ensures uniform electric field radiation and consistent protection across a wide range of installation scenarios. By leveraging the principles of physics and a carefully engineered cross-section, BADGERCORD outperforms other solutions on the market, ensuring long-lasting and comprehensive protection for vital assets.