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Specialty Magnesium Anodes
by Farwest Corrosion
Control
Cathodic Protection Against Corrosion
Specialty
Magnesium Anodes
Farwest Corrosion Control offers a complete line of
specialty cast and extruded sacrificial magnesium anodes for a variety
of uses. These anodes can be submerged in fresh, brackish or seawater
environments. Many of the anodes are available with an optional Plastisol coating designed to be cut away from the anode, limiting
surface area contact and current output.
Galvanic Efficiency
Anodes are produced to H-1 or AZ-63
specifications and have a current efficiency of approximately 55% in
seawater with a current capacity of 550 amp/hour per pound. Open circuit
potential of this alloy is nominally -1.55 volts with respect to a
copper-copper sulfate reference electrode.
Chemical Composition (%)
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Element |
H - Grade B |
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Aluminum |
5.3 - 6.7% |
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Manganese |
0.15% min |
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Zinc |
2.5 - 3.5% |
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Silicon |
0.30% max |
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Copper |
0.05% max |
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Nickel |
0.003% max |
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Iron |
0.003% max |
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Other |
0.30% max |
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Magnesium |
Remainder |
Applications
Farwest's magnesium anodes are effective and economical
corrosion fighters that for over 25 years have been protecting a variety of steel
structures in a wide variety of environments, including salt, brackish and fresh water:
- 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
- Traveling screens
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Magnesium Condenser Anodes
Magnesium condenser anodes are used in
many different applications such as tank interiors, condenser water
boxes, heat exchangers, etc. These anodes are produced in a number of
shapes, weights and configurations to meet customer requirements.
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The popular model C-15 has a nominal weight of 15 pounds with a
3/4" galvanized steel pipe core. This anode can be furnished either bare or with an
optional Plastisol coating. |
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Model |
Part No. |
Weight |
Size |
Core Type |
| C15 |
01-13020 |
15 lbs |
8" x 8" x 4" |
Cast-in
galvanized
3/4" steel pipe core |
| C7.5 |
01-13015 |
7.5 lbs |
8" x 8" x 2" |
| 2R5 |
01-13014 |
2.5 lbs |
5" dia x 2" |
| 2R5 |
01-13012 |
2.5 lbs |
5" dia x 2" |
Cast-in
galvanized 1/2" steel pipe core |
| 2R5 |
01-13016 |
2.5 lbs |
5" dia x 2" |
Drilled and tapped for 1/2" x 13 bolt |
Flush
Mount Hull Anodes
Hull anodes are a popular solution for
many submerged cathodic protection applications. Available with cast-in
steel mounting straps, hull anodes can be either bolted or welded
directly to a submerged structure. Applications include barges, ships,
dams, tanks, piers, pilings or similar structures.
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H-22A:
Popular anode weighing about 22 pounds. Contains two cast-in 1/4" x 1
1/2" galvanized steel straps that are easily welded to the steel hull
structure. A Plastisol
coating is available as an optional current barrier. |
| H-44:
Weighs about 44 pounds and contains two cast-in porcelain coated steel
brackets. elongated holes are provided 1 1/4" x 1" on 10" centers for easy
mounting. A Plastisol
coating is available as an optional current barrier. |
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H-44T:
Weighs about 50 pounds and is similar to H-44, but with tapered end. A Plastisol
coating is available as an optional current barrier. |
| ML-5 Launch Anode:
Weighs about 5 pounds and contains cast-in galvanized steel straps with two 5/8"
holes for mounting. Widely used on steel hull service boats. |
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H-24W:
Weighs about 24 pounds and contains two cast-in 1/4" x 2" galvanized steel
straps. Mounting holes 3/4" in diameter are provided. A Plastisol
coating is available as an optional current barrier. H22, H-44W: Same as 24-W,
but weigh about 22 and 44 pounds, respectively. |
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Model |
Part No. |
Weight |
W |
L |
La |
H |
Core Type |
| ML-5 |
01-13324 |
5 lbs |
5" |
10" |
- |
2-½" |
Cast-in
galvanized steel
strap, 14-¼" long |
| H-22 |
01-13079 |
22 lbs |
10" |
20" |
10" |
2" |
Two cast-in
galvanized
steel straps, ¼" x 1-½" |
| H-24W |
01-13081 |
24 lbs |
9" |
18" |
8" |
2" |
| H-44 |
01-13070 |
44 lbs |
7" |
15-½" |
10" |
4-¾" |
| H-44W |
01-13084 |
44 lbs |
9" |
18" |
8" |
4" |
| H44-T |
01-13088 |
50 lbs |
7" |
25-½" |
10" |
4-¾" |
Pier Anodes
Built for a number of applications, pier
anodes can be suspended in water environments or installed directly onto
the seabed or lakebed. The relatively large magnesium content provides
longer anode life. Anodes are available with either a steel eyebolt or
pipe core.
- Pipe: ¾” galvanized steel
pipe core extending 1” beyond anode ends
- Eyebolt: ½” diameter
galvanized steel eyebolt core. ¾” diameter for 200 pound anode.
Farwest can install a specified length,
size and type of cable for attachment to the structure.
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| Model |
Weight |
Size |
Core Type |
| MG-P-50C |
50 lbs |
8" dia x
16" |
Pipe |
| MG-P-50C |
50 lbs |
8" dia x
16" |
Eyelet |
| MG-P-100C |
100 lbs |
8" dia x
32" |
Pipe |
| MG-P-100C |
100 lbs |
8" dia x
32" |
Eyelet |
| MG-P-200C |
200 lbs |
12" dia x
27" |
Pipe |
| MG-P-200C |
200 lbs |
12" dia x
27" |
Eyelet |
Tank Anodes
Primarily designed for tank interiors,
tank anodes utilize a longitudinal steel strap core for bolting or
welding to the steel surface.
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| Model |
Weight |
W |
H |
La |
Lc |
X |
Core Type |
| T36 |
36 lb |
4" |
4" |
28" |
38" |
36" |
Longitudinal, galvanized
steel core, 3/8" x 1-½" |
| T-52A |
52 lb |
5" |
5" |
29" |
38" |
36" |
| T53 |
53 lb |
7" |
7" |
16" |
24" |
22" |
Model T-57 contains a cast-in, galvanized
steel core 3/8" x 1 3/4" with 11/16" dia. mounting holes.
Model DC-60 contains a cast-in galvanized steel core 3/8" x 2" with
13/16" dia. mounting holes.
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| Model |
Weight |
W |
H |
La |
Lc |
X |
Y |
Core
Type |
| T-57 |
57 lb |
7" |
7" |
16" |
21" |
19" |
8" |
Longitudinal, galvanized
steel core, 3/8" x 1-¾" |
| DC-60 |
60 lb |
6" |
6" |
30" |
21" |
19" |
10" |
Longitudinal, galvanized
steel core, 3/8" x 2" |
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