Joined: May 2008
Posts: 10,106
Likes: 2,762
From: Fredericksburg, Va
Bikes: ? Proteous, '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, 'Litespeed Catalyst'94 Burley Duet, 97 Specialized RockHopper, 2010 Langster
Sure. Possible but improbable.
Rust is oxidized iron and forms from chemical reaction including water molecules and air. For rust to propagate, the moisture density would have to dynamically vary from one end to the other.
Not likely in a small volume like a chain stay. If the BB were openly exposed, maybe.
The mechanics doesn't matter, as stated.
Keep it dry to minimize rust. I have a dehumidifier in my garage where my bikes and tools are stored.