Mercedes-Benz Body & Equipment Guideline for Metris - BM 447, Version November 27, 2015.
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Please observe the revision notes compared to 09/18/2015 ! Only print out complete sections of the current version!
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6.3 Corrosion protection measures
6 Damage prevention
6.3
Corrosion protection measures
Surface and corrosion protection measures must be
carried out on the areas affected after modifications
and installation work have been performed on the
vehicle.
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Note
Only protective agents tested and approved by
Daimler AG may be used for any corrosion protection
measures performed.
H
Environmental note
As of July 01, 2007, surface protection (e.g. including
acc. to DBL 9440.40) is no longer allowed to contain
chromium 6.
Planning measures
Corrosion protection measures should be included in
the planning and design stages by selecting suitable
materials and designing components accordingly.
i
Additional information
A conductive connection occurs if two different met-
als are brought into contact with each other through
an electrolyte (e.g. air humidity). This causes elec-
trochemical corrosion and the less noble of the two
metals is damaged. The further apart the two metals
are in the electrochemical potential series, the more
intense electrochemical corrosion becomes.
For this reason, electrochemical corrosion must be
prevented by insulation or by treating the compo-
nents accordingly, or it can be minimized by select-
ing suitable materials.
Preventing contact corrosion by means of electrical
insulation
Preventing contact corrosion
1 Insulating washer
2 Insulating sleeve
Contact corrosion can be prevented by using electrical
insulation such as washers, sleeves or bushings.
Avoid welding work on inaccessible cavities.