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Stainless steel fixings

Stone Conversations : Archive 6 : Message 00651

From: "Simon Brown" <moonsong@zzzzzzzzzzzzzzz>
Date: Thu, 23 Sep 2004 07:30:40 +1000
Subject: Stainless steel fixings

Quoted text begins.reference for the 'ceramic' info?
End of quote.


Hi Philip,

A bit about ceramic: http://www.mcnallyinstitute.com/CDweb/c-html/c036.htm

I'm only a humble stonemason, not a metallurgist, but I understand that the
formation of the very durable chrome oxide is instantaneous. So you can bend
& cut your stainless steel fixings and embed them into mortar or epoxy
straight away, where they will protected from corrosion despite the absence
of oxygen.

As you point out, corrosion problems could occur where the stainless steel
is subjected to chloride attack or physical wear in an oxygen-free
environment like painted, insulated steam pipe or a sealed boat-propeller
drive shaft. Stainless steel stone-fixing dowels are pretty safe because
they are protected from further corrosive attack by the ceramic layer formed
before installation.

Good point about Galvanic reaction causing crevice corrosion. Choose metals
close to each other in the Galvanic series. The Statue of Liberty's inherent
problems you are probably familiar with:
http://www.corrosion-doctors.org/Aircraft/statue-saddle.htm

Regards,
Simon

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