Magnesium Anode (Square Type)

Highly effective square magnesium anodes for soil corrosion control. Ideal for medium to high resistivity soil, offering substantial protection to buried steel structures.



When it comes to combating corrosion in scenarios where impressed current cathodic protection isn’t suitable, magnesium anodes emerge as a widely embraced solution. Particularly in soil environments, bare magnesium anodes are the go-to choice due to their effectiveness. They operate by leveraging their more negative potential, resulting in a robust driving voltage that enables them to offer ample protection to underground steel structures, especially in soils with medium to high resistivity (ranging from 1,000 to 10,000 Ω·cm).

These bare magnesium anodes come in two primary types, each with a distinct electrode potential concerning the Cu/CuSO4 reference electrode. This differentiation allows them to cater to various needs in corrosion protection for buried metallic structures across different soil resistivities. High-potential magnesium anodes, for instance, find utility in arid or resistant soil conditions, or when there’s a demand for increased current due to insufficient tank coating. On the other hand, standard-potential magnesium anodes excel in corrosive soil environments, particularly when the tank coating is well-maintained, providing longevity that surpasses that of high-potential alloys in such scenarios.

Quality Substrate Material

Our magnesium anode adheres to strict manufacturing standards, specifically ASTM B843-M1C for high-potential variants and ASTM B843-AZ63B for standard-potential options. These standards govern the composition of the anode, ensuring its quality and performance.

Element High Potential (ASTM B843 – M1C) Standard Potential (ASTM B843 – AZ63B)
Aluminum (Al) 0.01% 5.3 – 6.7%
Manganese (Mn) 0.5 – 1.3% 0.15 – 0.7%
Zinc (Zn) 2.5 – 3.5%
Silicon (Si) 0.05% 0.1%
Copper (Cu) 0.02% 0.02%
Nickel (Ni) 0.001% 0.002%
Iron (Fe) 0.03% 0.003%
Other Each 0.05%
Others Total 0.3% 0.3%
Magnesium (Mg) Remainder Remainder


Different Electro-potential Options

Two prevalent cast magnesium anode options are readily available:

1. Conventional Magnesium Alloy Anode

A standard-potential anode boasts a corrosion potential of approximately -1.55 volts relative to a Cu/CuSO4 reference electrode. This type is well-suited for soil environments with resistivity levels below 20 Ω·cm.

2. Enhanced Potential Magnesium Alloy Anode

Enhanced potential magnesium anodes exhibit a higher open circuit voltage and driving potential compared to conventional variants. They typically achieve an open circuit potential ranging from negative 1.7 to 1.75 volts, representing a 20% to 30% increase over traditional magnesium anodes. This heightened potential results in enhanced current output and efficiency, enabling effective cathodic protection while minimizing anode consumption. They excel in safeguarding structures buried in soils with resistivities surpassing 2,000 Ω·cm or those prone to multiple corrosion clusters.

Technical Measurement High Potential Standard Potential
Open Circuit Potential (-V) 1.7 ~ 1.75 1.5 ~ 1.55
Close Circuit Potential (-V) 1.58 ~ 1.62 1.45 ~ 1.50
Min. Current Capacity 500 A.h/lbs (1100 A.h/kg) 550 A.h/lbs (1230 A.h/kg)
Min. Current Efficiency 50% 55%

Remarks: Open/close circuit potential is with respect to a Saturated Calomel Reference Electrode.

Measured Electrical Efficiency Curve of Bare Magnesium Anode 750x500 1

Strict Quality Control

Our anodes are produced, examined, and tested following the strictest quality control protocols in compliance with ISO 9001:2015 standards. This ensures that they meet rigorous quality standards and deliver optimal performance.


Utilizing the ISO 9001:2015 quality management framework and stringent internal testing protocols, we guarantee the maximum durability and effectiveness of our anodes. Every individual anode is assigned a distinct serial number, facilitating comprehensive quality monitoring throughout its lifespan.

Technical Measurement Chemical Composition Electrochemical Performance Physical Properties
Testing Standard ATSM A518 (Gr1) ATSM A518 (Gr3) Foundry ITP
Testing Content Chemical Analysis Circuit Potential / Anode Resistance / Current Efficiency Surface Finish / Dimension & Weight / Steel Core / Cable Connection / Sealing / Backfill Packaging
Equipments Optical Emission Spectrometer OBLF QSN 750 Electrochemical Analyzer EPI 200 Calibrated Digital Measuring Devices