Electronics > Projects, Designs, and Technical Stuff

Electrical contacting on aluminium busbar

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Siwastaja:
Yeah, aluminium alloys are great for the mechanical sturdiness - low weight - low cost combo (as you could guess from the fact aeroplanes are made from it).

Almost all large-scale electrical power transmission is based on aluminium wiring and yes, even bus bars. It's a solved problem, although you need to know what you are doing and to have the process right to avoid quality issues. Copper is easier for the rest of us, but if you need to combine electricity transfer to mechanical support, aluminium's pretty high on the list!

coppercone2:
Nah what made me weary is reading about it and seeing someyhing one bees dick from a full structure fire because of aluminum wiring. The oxide growth is insidious.

I feel bad for ypur train man, burning choo choo :'(

TomS_:

--- Quote from: TERRA Operative on February 27, 2019, 12:26:45 pm ---I can't remember the brand of grease we used beyond it being a slightly green/brownish grey and being in a tall squeeze bottle with a red lid.....

--- End quote ---

Try searching for "NO-OX-ID".

duak:
I would recommend Alodine.  This is a chemical conversion process that leaves chromate on the aluminium surface that prevents the oxide layer from forming.  It was developed for the aircraft industry and is widely used.  We could get pieces done in Vancouver, Canada (an industrial backwater) over 40 years ago.

I see there is a Swiss company that might be helpful: https://www.bwb-group.com/en/Procedures_overview/Surface-treatments-for-aircraft.php

There are also dielectric greases and oils available to the electrical industry here that are applied to the contact areas before mechanical bonding.  These exclude air from the joint to prevent oxidation.

Cheers,

damien22:
We will investigate all the solution proposed, many thanks for the feedback!  :-+

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