Different metals must not touch if this could cause contact corrosion or corrosion damage. Direct metallic contact is to be prevented through the use of suitable coatings or separation layers. It is also important to pay attention to the order of the materials in the watercourse.
The table is intended to give an overview of how aluminium may be connected to other metals and which building materials should be used with caution.
Material pairing |
Country atmosphere |
City/Industry atmosphere |
Lake/near the sea |
Zinc |
+ |
+ |
+ |
Stainless steel |
+ |
+ |
+ |
Lead |
+ |
+ |
– |
Uncoated steel |
– |
– |
– |
Copper |
– |
– |
– |
Dry concrete |
+ |
+ |
– |
Concrete not set |
– |
– |
– |
No water should come from copper parts (e.g. gutters, edging, chimney caps, sheet metal coverings) onto PREFA aluminium products (observe the electrochemical series). If this is already the case, these parts must be replaced, otherwise the materials will corrode.
PREFA aluminium products must be protected from damaging influences by other building parts (e.g. concrete) or the environment (e.g. corrosive environment).
Impurities such as drilling dust, mortar residues or effluent from concrete on coated or blank aluminium parts must be removed immediately.
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