Description

Magnesium anodes are an effective solution for preventing corrosion in situations where impressed current cathodic protection is not suitable.

Bare magnesium anodes are commonly employed in soil environments, offering a higher negative potential that provides ample protection to underground steel structures in soils with medium to high resistivity levels (1,000 – 10,000 Ω·cm).

Our bare magnesium anodes come in two variations with different electrode potentials relative to a Cu/CuSO4 reference electrode. These anodes are versatile and can safeguard various buried metallic structures across different soil resistivities.

High potential magnesium anodes are suitable for dry or resistant soil conditions and areas requiring increased current due to poorly coated tanks. On the other hand, standard potential magnesium anodes are ideal for corrosive soil environments, especially if the tank has a good coating, ensuring extended lifespan compared to high potential alloys.

Quality Substrate Material

Our magnesium anode adheres to ASTM standards: B843-M1C for high potential and B843-AZ63B for standard potential, with the specified composition as follows:

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 main types of cast magnesium anodes are available:
1. Standard Magnesium Alloy Anode

These anodes have a standard potential with a corrosion potential of approximately -1.55 volts relative to a Cu/CuSO4 reference electrode. They are recommended for soil conditions with resistivity below 20 Ω·cm.

2. High Potential Magnesium Alloy Anode

High potential magnesium anodes offer increased open circuit voltage and driving potential. They exhibit an open circuit potential ranging from negative 1.7 to 1.75 volts, representing a 20-30% enhancement compared to conventional magnesium anodes. This results in higher current output and improved efficiency, providing adequate cathodic protection while reducing anode consumption. They are particularly suitable for structures buried in soils with resistivities over 2,000 Ω·cm or structures with significant 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.

Strict Quality Control

Our anodes are crafted in compliance with ISO 9001:2015 standards, undergoing rigorous manufacturing, inspection, and testing processes. This adherence to stringent quality control protocols guarantees optimal performance and reliability.

Testing

Our anodes are manufactured under ISO 9001:2015 standards, utilizing strict internal testing protocols to guarantee superior durability and performance. Each anode is assigned a unique serial number for quality traceability.

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