38
Gearbox
Contact corrosion, using a bolted connection
as an example
In this example, a magnesium component is
attached using a bolt made is an iron alloy. If
the contact surface is wetted with water, an
electric current occurs between the two
metals. This leads to contact corrosion. The
magnesium is decomposed at the same time.
Contact corrosion can be prevented by inhibiting
the electric current between the two metals by
coating the bolt with an insulating layer. This
insulating layer is composed of a special
non-conductive coating.
A special coating is applied to all add-on parts which come into direct contact with
magnesium. Please follow the instructions given in the Workshop Manual.
Water
Special coating
Magnesium
Water
Corrosion
SSP 192/097
SSP 192/061
Summary of Contents for Passat '97
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