Magnesium makes a superior sacrificial anode for the protection of underground steel pipelines, and water heaters. By connecting a magnesium anode to a structure of a different metal, electrical current is generated that polarizes the structure, making the entire surface a cathode.
High potential anodes can be used to protect most buried metallic structures found in a range of soil resistivities. Because they produce a higher driving voltage than conventional magnesium anodes, they are ideally suited for structures buried in soils with resistivities in excess of 2,000 ohm-cm, or containing numerous corrosion "hot spots".
| Type | Bare Anode Weight |
Shape | Width | Height | Length |
|---|---|---|---|---|---|
| 1 S1 | 1 lb | Square | 1-3/4" | 1-3/4" | 8" |
| 3 D3 | 3 lbs | "D" shape | 3-1/2" | 3-1/2" | 5-1/4" |
| 5 D3 | 5 lbs | "D" shape | 3-1/2" | 3-1/2" | 9-1/4" |
| 9 D2 | 9 lbs | "D" shape | 2-3/4" | 2-3/4" | 26-1/4" |
| 9 D3 | 9 lbs | "D" shape | 3-1/2" | 3-3/4" | 13-3/4" |
| 17 D2 | 17 lbs | "D" shape | 2-3/4" | 2-3/4" | 50-1/4" |
| 17 S3 | 17 lbs | Square | 3-1/2" | 3-1/2" | 25" |
| 17 D3 | 17 lbs | "D" shape | 3-1/2" | 4" | 25-1/4" |
| 20 D2 | 20 lbs | "D" shape | 2-3/4" | 2-3/4" | 56-3/4" |
| 24 D4 | 24 lbs | "D" shape | 4-3/4" | 4-3/4" | 23-1/2" |
| 32 D3 | 32 lbs | "D" shape | 3-3/4" | 4" | 47" |
| 32 D5 | 32 lbs | "D" shape | 5-1/2" | 5-3/4" | 20" |
| 40 D3 | 40 lbs | "D" shape | 3-3/4" | 4" | 56-1/2" |
| 48 D5 | 48 lbs | "D" shape | 5-1/2" | 5-3/4" | 30-1/4" |
| 60 D4 | 60 lbs | "D" shape | 4-3/4" | 4-3/4" | 57-1/2" |