[modeleng] Re: Stainless fasteners
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 4 Nov 2004 03:11:37 -0000
If I knew what A4 was...
I suspect that it is marine grade, 316, as used to be.
Personally, I wouldn't worry about corrosion in that use, but would keep a
wary eye on it, just in case.
alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
www.alanstepney.info
Model Engineering, Steam Engine, and Railway technical pages.
----- Original Message -----
From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, November 02, 2004 11:57 AM
Subject: [modeleng] Re: Stainless fasteners
Thanks for that Rich.
My understanding is that that is not a problem with A4. if anyone knows
better let me know. I think there is an oxide layer which effectively
prevents further corrosion either galvanically or otherwise but that the
mechanism (I always wonder why that is not a chemism but hey) you outline
can be a problem with other grades and so for example A2 will corrode in the
presence of chloride ions. The galavanic corrosion could occur by the way
with either copper or tin so both copper and bronze are in the frame.
I shall however be monitoring anxiously the start of any fasteners which
penetrate into the boiler interior.
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