Sacrificial Anode - Volkswagen Marine TDI 100-5 User Manual

Cooling system
Sacrificial anode
Due to the incoming seawater, disintegration in
accordance with electrochemical series can
occur on the materials with which the seawater
comes in contact.
To ensure no engine component is affected, a
reactive or sacrificial anode is located in the
main heat exchanger. It disintegrates (sacrifices)
itself, thus protecting the other components.
Electrochemical series
Charge carrier exchange occurs between
different metals in the presence of water. As the
result of this exchange, the lower grade of both
metals disintegrates.
The electrochemical series is obtained by
arranging the metals in a series from the lower
grade to the higher grade metal.
The further the metals are apart in the series the
higher the charge carrier exchange and thus the
disintegration.
H O
2 2 2 2
Magnesium
Sacrificial anode
Aluminium Iron
Al Fe
Superior 68 Technology
Lead Copper
Pb Cu
Please refer to the Owner's
Handbook or the current Workshop
Manual for instructions on how to
replace the sacrificial anode.
MSSP_001_070
Gold
Au
MSSP_001_071