[TheForge] last project

Fri Jun 6 01:24:00 2003

Na we passivated thousands of parts for the wafer boys, I never once saw a
grey one, and my buddy has different tanks for passivation and
electropolish, going to have to figure out what the deal is LOL.

Paul
----- Original Message -----
From: "RIES NIEMI" <[email protected]>
To: <[email protected]>
Sent: Thursday, June 05, 2003 10:25 AM
Subject: Re: [TheForge] last project

> on 6/5/03 12:03 AM, Paul Hewitt at [email protected] wrote:
>
> > Ya know it just occurred to me that what your doing isn't really
> > electropolish its passivation.  We passivate anything we heat, actually
what
> > happens when you weld is you burn off some of the nickel and chromium
from
> > the stainless and float the iron which turns colors to the surface.  Duh
> > somedays I should engage the brain.  What was that Dain Bramage.  The
answer
> > is nitric acid, and electricity.  I have done that but I use a scotch
brite
> > pad a grey one not a red one.  I have an inverter 300 amp welder that
goes
> > 0-50 v and 0-300 amps I use it for a power supply to do that but I have
> > never used it on a weld per say we have "scrubbed" the inside of
finished
> > tanks where the weld zone shows through by causing oxidation. Or just
plain
> > heat marks. Passivation is the removal of iron from the surface to
prevent
> > discoloration.
>
> I will have to dig out the reference books to check for sure, but as I
> understand it electropolishing and passivation are basicly the same thing-
> the only difference is the acid, the time in tank, and the shininess of
the
> result.
> If it comes out gray, its passivated.
> If it comes out shiny, its electropolished. Its also passivated too.
>
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