Dissimilar metal corrosion: avionics tray?

[Steve Crewdog]

One of my local experts says I can't use nutplates on my 4043 aluminum avionics tray without powder coating it or I'm going to get dissimilar metal corrosion between the nutplates/cherrymax rivets/4043. Other areas of the SeaRey have nutplates riveted to the aluminum frame (6061T) with cherrymax rivets, so under his logic the build is already flawed in design.


Thoughts?


TIA

[bjdecker]

Here's an article on galvanic corrosion -- good read...

https://en.wikipedia.org/wiki/Galvanic_corrosion

Additionally, plate nuts are usually passivated in some way, either via phosphoric acid etch, molybdenum coating, cadmium plating, etc. so they aren't conductive like bare metal.

[Low Pass]

You need an electrolyte for galvanic corrosion. I.e., dirty or salty water. If dry, you should have no problem.

[Steve Crewdog]

Thanks gents.