At 12:00 PM 6/30/2006 -0700, Alistair Bell wrote:
>The surface area of the sacrificial metal, Al, was much, much greater
>than the "gaining " metal stainless. Imagine the corrosion if it were
>the other way around, or imagine someone using aluminium pop rivets
>in a stainless structure exposed to salt air or spray, the rivets
>would be corroded away in no time.

I've seen aluminum castings (aluminum cleat on anodized aluminum
mast, s/s fastenings) burst apart because the corrosion products from
the aluminum could no longer fit in the slack space of the mounting holes.

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"