Extruded
Magnesium Anode
Extruded magnesium anodes have high surface and length ratios in relation to cross sectional size. This allows these anodes to deliver a higher current per weight than standard cast magnesium anodes. By supplying more current, extruded anodes can deliver effective protection to structures buried in high resistivity soils.
Rod anodes is manufactured with a solid steel core in the center of the anode. This core distributes current uniformly through the anode to prevent excessive discharge near the connection end.
Typical Applications
The rod shaped anodes, with their small diameters, are often used in commercial and industrial water heaters and storage tanks, or driven into the ground to protect gas service risers.
Available Configurations
- Plain Ends
- Ends with Core Wire exposed
- Capped Ends
- Ends with Lead Wires Attached
Anode rods are available as either the standard GALVOROD anode or the high current output GALVOMAG anode. GALVOLINE ribbon anode is manufactured with the high current output composition.
In most environments, the oxidation potential is 1.4 to 1.5 volts for GALVOROD and 1.6 to 1.7 volts for GALVOMAG (with respect to a copper-copper sulfate reference electrode). Because of its higher oxidation potential, GALVOMAG anodes of a given size deliver approximately 25% more current (milliamperes) than GALVOROD anodes of the same size. As electrolyte resistivity increases, the need for GALVOMAG anodes increases.
Standard Anode Sizes
Length Tolerances
Plain Anode Rods
¢Up through 4.999 ft: +1/8", -0"
¢
5 ft through 19.999 ft: 1/4", -0"
¢
20 ft and over: +1", -0"
Shipping Tolerances
¢Rods: +/-2% of pieces ordered.
Packaging
¢Rods: Cardboard cartons on wood pallets.
Structures in High Resistivity
Electrolytes
Chemical
Elements % |
| |
Al |
Mn
|
Zn
|
Si
|
Cu
|
Ni |
Fe
|
Other
each |
Other
total |
Mg
|
| AZ31D |
2.5
- 3.5 |
0.2
- 1.0 |
0.6
- 1.4 |
0.05
max |
0.01
max |
0.001
max |
0.002
max |
0.05
max |
0.3
max |
Balance
|
Electrochemical
|
| Potential |
Capacity |
-1.5V Cu/CuS0 4 Reference
Electrode
|
545 Amp hrs/lb 1200 Amp hrs/kg |
Nominal diameter, inches |
Core centering, within inches
|
Core wire diameter, inches
|
Straightness, inches in 2
ft |
Approx. weight, lbs/ft |
| 0.500 -0.020 |
.040 |
0.135 |
0.060 |
|
0.675 -0.020 |
.050 |
0.135 |
0.060 |
0.30 |
0.750 -0.020 |
1/16 |
0.135 |
0.040 |
0.372 |
0.840 -0.020 |
1/16 |
0.135 |
0.040 |
0.456 |
1.050 -0.020 |
1/16 |
0.135 |
0.040 |
0.684 |
1.315 -0.020 |
1/16 |
0.135 |
0.040 |
1.068 |
1.561 -0.020 |
1/16 |
0.188 |
0.025 |
1.50 |
2.024 -0.020 |
1/8 |
0.188 |
0.025 |
2.50 |
3/8" x 3/4"
rectangle, 1/8" radius corners |
1/16 |
0.135 |
Furnished in
coils with
sheared ends |
0.243 |
Used on
Anode
(Diameter) |
Dimensions for
Figure 6
(inches) |
Cap Threads
|
A |
B |
C |
D |
Internal Thread |
External Thread |
0.675, 0.750 |
1.06 |
.81 |
.19 |
.63 |
3/8-18 NPT |
3/4-14 NPT |
0.840, 0.900 |
1.06 |
.81 |
.19 |
.63 |
1/2-14 NPT |
3/4-14 NPT |
1.050 |
1.31 |
1.19 |
.44 |
1.00 |
3/4-14 NPT |
1-11 1/2 NPT |
| Chemical Elements % |
| Element |
Al
|
Mn |
Cu |
Ni |
Fe |
Other |
each Other |
total Mg |
| M1C |
0.01 max |
0.5 - 1.3 |
0.02 max |
0.001 max |
0.03 max |
0.05 max |
0.3 |
Balance |
Electrochemical
|
| Potential |
Capacity |
-1.7V Cu/CuS0 4 Reference
Electrode |
545 Amp hrs/lb 12230 Amp
hrs/kg |
|
