[TheForge] Hydrochloric acid and galvanising

Mon Jul 21 22:33:01 2003

Well Ive figured out after a test that it definately isnt Hydrochloric acid,
and my vinegar test didnt work either, I used fermented white vinegar so Im
not sure if that was the right stuff. I seem to recall now that on one of
the UMBA tapes theres a guy doing this in a bucket to some chain but I dont
know which tape it was and Ive got too many to look through them all, anyone
else seen that tape??

----- Original Message -----
From: "Rick Crawford" <[email protected]>
To: <[email protected]>
Sent: 19 July, 2003 9:40 PM
Subject: Re: [TheForge] Hydrochloric acid and galvanising

> Years ago we had a wood stove in the kitchen, and used galvanized stove
pipe
> for the exhaust.  We would have liked to use black, but had this
available,
> so used it.  While it was hot, we put some vinegar on it and that turned
it
> black.  Did a real nice job.
>
> Rick Crawford at Rafter Lazy C
> Home of Rick's Forge and LEM the Wonder Mule
> In the middle of Northern Illinois
> http://www.rafterlazyc.com
> [email protected]
>
> ----- Original Message -----
> From: "Bruce Freeman" <[email protected]>
> To: <[email protected]>
> Sent: Friday, July 18, 2003 11:10 AM
> Subject: Re: [TheForge] Hydrochloric acid and galvanising
>
>
> > I strongly doubt that PURE hydrochloric acid would make galvanized turn
> > black.  What else have you had in this acid?
> >
> > If you pickle the zinc off the steel, the steel should be shiny, not
> > black.  I think you've left something behind, but I don't know what.
> >
> > Black is often due to finely divided metal.  I'm wondering whether you
> > may be precipitating out some less-active metal on the surface of your
> > galvanized steel.  If this is the case, no telling how stable it would
> > be.  Finely divided metal could be loose as a powder.  Even if not
> > loose, it would react with air fairly readily.  So, I doubt this would
> > be a stable color.
> >
> > Zinc and other metals can be turned black by sulfide - but you won't
> > find sulfide in hydrochloric acid.
> >
> > Don't know whether this helps.
> >
> > Bruce
> > NJ
> >
> > >>> [email protected] 07/17/03 11:23PM >>>
> > Does anyone know if the blackend look adding H Ch acid to galved steel
> > is as
> > durable to corrosion as plain galv? whats the reaction that makes it
> > go
> > black? have I even got the right acid, I did this a long time ago and
> > havent
> > used it since. Does it actually react or just remove the galv and show
> > black
> > steel?
>
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