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Letter 25043
Passivation of stainless steel
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Thought everyone may be interested in this article from Modern
Machine Shop magazine. It is about passivation of stainless steel, a
confusing subject.
http://www.mmsonline.com/articles/100304.html
We braze 304L stainless steel assemblies. The braze furnace is run
at around 2000 degrees F, and has a highly reducing atmosphere. Any
protective oxides are wiped out in this process. We have data that
shows a brazed stainless part will show a lot more rust in salt spray
than stainless before braze. This is normal, and does not usually
cause problems, but recently we've had rejections for rust on
production parts. We've been looking into this and think moisture in
our dunnage may be at fault. In our research, we also found the above
article. Any comments?

Tim Neveau
2nd tier automotive - Rochester Hills, MI, USA
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