Magnesium has the highest driving voltage of materials
used for sacrificial anodes and is most commonly used
onshore (in higher resistivity electrolytes) where
the use of zinc and aluminium would be uneconomical.
The most common applications are:
Temporary CP systems
Temporary protection of land and other pipelines during
construction and before the engineering of the impressed
current system. The anodes are easily installed within
the pipe trench as construction proceeds. Additional
excavation is not required.
| Permanent CP systems |
| - | land pipelines |
| - | service pipes to domestic and commercial premises |
| - | short pipes including river crossings |
| - | external surfaces of buried storage tanks, particularly
oil tanks in hazardous areas |
| - | external surfaces of caissons in fresh or brackish
waters |
| - | internal surfaces of water storage tanks and treatment
plants |
| - | internal surfaces of calorifiers, heat exchangers and
condensers |
| - | protection of "hot spots" |
| - | supplementary protection on pipelines with impressed
current CP systems |
| - | where space is very limited, for example the internal
protection of pipelines |
| - | the protection of short steel / iron pipe lengths or
fittings (flanges, valves etc.) within non-metallic
pipe systems |
