I saw some passivation on Modern Marvels. It did not look like something you would want to F with (the acid). Send it out to an electroplater. They should be able to passivate as well, or you could just chrome plate it.  
Seems like any precipitation hardened Aluminum alloy that was not anodized well would suffer from galvanic corrosion with itself due to the grains of precipitate also being present at the surface next to the Aluminum matrix, thereby forming a galvanic corrosion reaction in the presence of water with ions in it.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
Last edited by Flieger; 09-09-2011 at 11:17 AM..
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