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Magnesium anodes are most economical when used on land where high driving potentials make them suitable for high resistivity soils and in brackish water and estuarine locations where the combination of salt and fresh water also gives high resistivities.
EPS offer magnesium anodes in two grades.
: : Standard
: : High potential
Composition and characteristics
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Elements |
Standard (Wt. %) |
High potential (Wt. %) |
| Aluminium |
5.3 – 6.7 % |
0.01 max |
| Zinc |
2.5 – 3.5 % |
0.03 max |
| Manganese |
0.15 % min |
0.5 - 1.3 |
| Copper |
0.02 % max |
0.02 max |
| Silicon |
0.1 % max |
0.05 max |
| Iron |
0.003 % max |
0.03 max |
| Others |
0.03 % max |
0.03 max |
| Magnesium |
Remainder |
Remainder |
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Anodes for buried structures
The anodes for buried pipelines, tanks and similar structures are normally supplied packaged in a cotton bag containing a rapid wetting, moisture-retaining backfill, which reduces the electrolyte resistivity adjacent to the anode, improved performance.
The standard backfill composition for magnesium anodes used of protecting underground structures is as given below :
Gypsum - 75 %
Bentonite - 20 %
Sodium Sulphate - 5 %
The anode supplied with PVC/XLPE insulated copper cables of standard size and length as per requirements.
Types of Magnesium Anodes
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