Magnesium Anodes

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Magnesium Hull – Pier – Condenser – Tank Anodes

Our magnesium anodes are produced in a variety of shapes and sizes for use in seawater, brackish water and fresh water cathodic protection systems

Galvanic Efficiency:

The current efficiency of Stuart Steel’s magnesium anodes is nominally 55% in seawater and the current capacity is about 550 amp-hr./lb. The open circuit potential of the magnesium alloy used is nominally -1.55 volts to a copper/copper sulfate half cell in seawater; the driving voltage to galvanized steel is about 0.70 volts providing a relatively high current output per anode.

Both hull and condenser anodes are available with a plastisol (polyvinyl chloride) coating which serves as an excellent current barrier shield.


Magnesium anodes are effective and economical corrosion fighters that for over 25 years have been protecting a variety of steel structures in salt, brackish and fresh water, including:
• Hulls of ships, barges, tugs and boats
• Ballast tanks of ore carriers and similar vessels
• Bulkheads
• Water storage tanks
• Piers and pilings
• Pipelines
• Heat exchangers
• Travelling screens

Core Types

Pipe – 3/4″ standard galvanized steel pipe core extending 1″ beyond ends.

Eyebolt – 1/2″ galvanized steel eyebolt core; 3/4″ eyebolt in 200 lb. size.

Magnesium Hull Anode

Specify at time of order bare or with plastisol coating
Plastisol coating on the sides, ends, and faying surfaces acts as a current barrier shield.

Stock Code Nominal Weight (lbs) Dimensions Additional Information
MAG-H-22 22 10″ x 2″ x 20″ Contains two cast-in 1/4″ x 11/2″ galvanized steel straps that are easily welded to the steel hull structure.
MAG-H-12W 12 9″ x 2″ x 9″ Contains one cast-in 1/4″ x 2″ galvanized steel strap with 3/4″ mounting holes.
MAG-H-24W 24 9″ x 2″ x 18″ Contains two cast-in 1/4″ x 2″ galvanized steel straps. Mounting holes 3/4″ in diameter are provided.
MAG-H-44W 44 9″ x 4″ x 18″ Contains two cast-in 1/4″ x 2″ galvanized steel straps. Mounting holes 3/4″  in diameter are provided.
MAG-10-LAUNCH 10 Contains cast-in galvanized steel strap with 9/16″ holes for mounting. Straps 1/4″ x 11/4″
MAG-5-LAUNCH 5 Contains cast-in galvanized steel strap with 5/8″ (16 mm) holes for mounting. Widely used on steel hull service boats.
MAG-JR 1.5 A teardrop-shaped anode.

Pier Anodes

Stock Code Nominal Weight (lbs) Cylinder Diameter Length Core Type (must specify)
P-50C 50 8″ 16″ Pipe or Eyebolt
P-100C 8 8″ 32″ Pipe or Eyebolt
P-200C 200 12″ 27″ Pipe or Eyebolt

Condenser Anodes

Specify at time of order bare or with plastisol coating

Stock Code Nominal Weight (lbs) Dimensions Core Type
MAG-15-S 15 8″ x 8″ x 4″ Pipe
MAG-7.5-S 7.5 8″ x 8″ x 2″ Pipe
MAG-6SX 6 8″ x 3″ x 4″ Pipe
MAG-2R5 2.5 5″ dia x 2″ Pipe
MAG-1R5 1.25 5″ dia x 1″ Pipe


Tank Anodes

Anodes contain cast-in, longitudinal, galvanized steel cores 1/4″ x 11/2″. Two elongated mounting holes 11/16″ x 11/2″ are provided.

Stock Code Nominal Weight (lbs) Dimensions
MAG-T-36 36 4″ x 4″ x 38″
MAG-T-52A 52 5″ x 5″ x 38″
MAG-T-53 53 7″ x 7″ x 24″
MAG-T-57 57 7″ x 7″ x 21″


Data on other tank anode sizes, weights and core configurations available on request.

National Headquarters:
801 Louisiana Street, Ste 310
Houston, TX 77002

Phone: 732-469-5544
Fax: 732-469-9270

Warehouse Addresses:
New Jersey
411 Elizabeth Avenue
Somerset, NJ 08873

66 Southern Court
Hiram, GA 30141

Parent Company:
Integrated Utility Services
© Stuart Steel Protection