Sacrificial Galvanic Anode Life & Mass Calculator
Calculate sacrificial galvanic anode consumption rate, required total alloy mass, service life (years), and anode quantity for Magnesium, Zinc, and Aluminum per NACE and DNV standards.
Cathodic Protection Demand & Anode Alloy
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Frequently Asked Questions
Why is High-Potential Magnesium the most common sacrificial anode for buried pipelines?
High-potential magnesium (ASTM B843) produces an open-circuit potential of -1.75V relative to copper-copper sulfate (CSE), giving it a driving potential of 0.90V against polarized steel (-0.85V). This generous driving voltage delivers sufficient current even in moderate to high resistivity soils.
What is the anode utilization factor (u)?
The utilization factor (typically 0.85 or 85%) accounts for the fact that a sacrificial anode cannot be 100% consumed. When approximately 80% to 85% of the alloy dissolves, the internal steel core rod is exposed, the anode fractures, or contact resistance spikes, effectively terminating its functional life.
Why is special chemical backfill used around buried sacrificial anodes?
Packaged anodes are surrounded by a permeable cloth sack filled with 75% gypsum, 20% bentonite clay, and 5% sodium sulfate. This backfill retains ground moisture, prevents soil passivation crusting on the anode, and provides a low-resistivity contact environment for smooth dissolution.