Quote:
Originally Posted by Mister Towed
Hi Deni, yes, if you attach two different types of metal directly together one of them will corrode very quickly through galvanic corrosion.
That is a process where environmental moisture - rainwater, condensation, humidity etc., - acts as an electrolyte which conducts the electrical potential between the two different metals, effectively forming a crude battery. This rapidly causes one of the metals - whichever is least noble (resistant to corrosion) - to rapidly dissolve at the point of contact.
Whenever you connect different metals together you need to seal the join with a purpose made anti-corrosive jointing compound or you will get accelerated corrosion. I've listed one below but I haven't tried it and others are available.
The speed of this reaction is quite alarming, a good example being demonstrated in the U.S. show 'Mythbusters', who managed to dissolve a set of prison bars to the point of failure in about two weeks using Mexican Salsa as the electolyte.
Anyway, good luck with your build.
https://en.wikipedia.org/wiki/Galvanic_corrosion
http://www.mbfg.co.uk/bonding-struct...s/duralac.html
https://mythresults.com/episode26 |
Mister Towed - just saw your reply (somehow I missed it on a previous page) and it is very helpful as usual, so thank you. A while ago I was fixing something and I attached a thin plate of aluminium on top of a stainless steel piece using silicone as a glue. The aluminium plate reacted and pitted (oxidized) so badly across the whole surface and I had to remove it.