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Brass and aluminium are too far apart in their anodic index values so you will get galvanic corrosion just depends what environment they are in, any immersion esp. saline environments will accelerate the galv. corrosion.
Stainless steel (-.40V) too is quite far from aluminium (-.90V) Thats why aluminium boats with stainless props have zinc sacrificial anodes.
I too would suggest a chemical bonding agent that effectively forms a barrier between the 2 dissimilar metals.
Edit: Ideally you want the metals to have a difference of less than 0.25V in the anodic index (Wikipedia has a table)
Last edited by Kunama; 04-06-2013 at 01:08 PM.
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