Re: Joining aluminium in magnetic loop
This info may be of some interest to you:
Electrical Jointing of AluminiumA particular phenomenon associated with the jointing of aluminium conductors, concerns the
oxide film that forms rapidly on the surface of freshly cleaned aluminium exposed to air. This
oxide film is an insulator and must be removed with a scratch brush in order to achieve a
satisfactory and reliable electrical joint. The problem with aluminium is that the freshly cleaned
surface will quickly re-oxidise, hence it is important to coat the surface with a contact sealant.
Contact Sealants
Various sealant formulations have been developed to provide improved electrical and mechanical
performance as well as environmental protection to the contact area. The use of sealants is
recommended for aluminium to aluminium or aluminium to copper connections. Sealants are also
recommended for copper to copper joints which are subject to severe corrosive environments.
Non-gritted sealants are recommended for flat connections and as a groove sealant in bolted
connectors such as parallel groove clamps. Our gritted sealant is primarily used in compression
connectors. The sharp metallic grit particles provide multi-contact current carrying bridges
through remaining oxide films to ensure superior electrical conductivity.
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