John -

Not much of anything metallic lasts long by the sea, especially such
electrochemically unfriendly materials as iron and aluminum.  However,
there are commercially available aluminum pop rivets with aluminum
mandrels, though I don't know how reliable or installation friendly they
might be.

I don't recall the OP stating anything about an ocean view for their
product.  Rivets might not be wise, regardless of material activity, in
such an environment.


Regards,

Peter L. Tarver, PE
Product Safety Manager
Homologation Services
Sanmina-SCI Corp.
2000 Ringwood Ave.
San Jose, CA 95131-1749
V: 408-904-2081
F: 408-904-2095
M: 408-234-3529
[email protected]


> From: John Woodgate
> Sent: Friday, June 16, 2006 9:12 AM
> 
> 
> Peter Tarver <[email protected]> writes
> 
> >It is not the pop rivet, per se, that conducts the fault 
> current, but 
> >the joined metal sheets.  The pop rivet simply maintains intimate 
> >contact between two conductive materials.  The same is 
> generally true of screws.
> 
> After a year or so in a polluted atmosphere, the aluminium 
> sheets won't be in good contact any more.
> >
> >Rivets can be quite reliable and have been used in 
> electrical equipment for many moons.
> 
> Aluminium pop-rivets have a steel pin inside, which, in a salty 
> atmosphere, can make them corrode rather swiftly due to 
> electrochemical 
> effects. Chromate-passivated pins used to be available, which were 
> better, but they've fallen under the RoHS Directive in 
> Europe. I don't know whether there is any replacement.
> -- 

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