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Extruded Magnesium Anodes
For Specialized Protection
Magnesium anodes have the highest protection capability of any galvanic material. While these anodes are most commonly used in the cast metal form, certain structures can be better protected through the use of extruded magnesium configurations. Extruded magnesium anodes have high surface and length ratios in relation to cross-sectional size. This allows these anodes to deliver a greater amount of current per weight than their cast magnesium counterparts. By supplying more current, extruded anodes can deliver effective protection to structures buried in even highly resistive electrolytes.
Corrpro offers a full line of certified extruded magnesium anodes in both rod and ribbon forms. Certified rod anodes from Corrpro are available in high-potential (1.75-1.77 volts and 1.4-1.5 volts) alloys. They are furnished with a variety of connection options, and are offered in numerous diameters. Corrpro ribbon anodes are manufactured in 3/8" ´ 3/4" flexible coils, which can be easily shaped for use on a multitude of protection projects. The resilient ribbon anode is composed of a high-potential alloy, which produces an open circuit potential of 1.75-1.77 volts. Both the rod and ribbon anodes are constructed with a solid steel core, which runs lengthwise through the anodes for efficient electrical discharge.
Extruded magnesium anodes are most suitable for structures buried or submerged in highresistivity electrolytes. 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. The ribbon anode is used for the protection of pipelines and storage tanks. Extruded anodes are also employed to pre-polarize offshore structures that are to be protected with aluminum anodes.
Chemical Composition | ||
| Content % | ||
| Element | 1.75-1.77V | 1.4-1.5V |
| Al | 0.010 max | 2.5-3.5 |
| Mn | 0.5-1.3 | 0.20 min |
| Zn | - | 0.7-1.3 |
| Si | - | 0.05 max |
| Cu | 0.02 max | 0.01 max |
| Ni | 0.001 max | 0.001 max |
| Fe | 0.03 max | 0.002 max |
| Other | 0.30 max | 0.30 max |
| Magnesium | Remainder | Remainder |
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