If a current is applied, this is supplied from an external
source (rectifier, battery).
The materials used in sacrificial anodes are zinc, alu-
minum,
magnesium and iron. Please note that special
alloys are used, to meet the following requirements:
- No passivation, i.e. they do not stop supplying cur-
rent.
- Even consumption.
- Low polarization tendency, i.e. they retain a suffi-
cient potential difference to the object.
- Low self-corrosion.
Only use original anodes. Never paint over the anodes.
Iron anodes can be used to protect stainless steel and
bronze objects. Magnesium anodes can be used in
fresh water where the current supplied by zinc anodes
may not be enough in some cases. Please note that
magnesium anodes give overprotection to aluminum
in seawater. There is no risk of overprotection of alu-
minium if zinc or aluminum anodes are used for pro-
tection.
Arrangement and Planning, Electrochemical Corrosion
47704162 10-2014 © AB VOLVO PENTA 39
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