[meteorite-list] AD:Not a happy 'Campo'

From: mark ford <markf_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:48 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B3101448A_at_s-southern01.s-southern.com>

Bob,

The biggest one I have applied this treatment to, was a ~1kg campo that
belongs to Dave Harris, as far as I know it is still stable (Dave?),
though with that one I also coated the exterior with a protective
coating I did a Nantan for him in the same way, that was really sick.

I have also done it with a 250g Toluca, and a 200g Baby Campo I have,
all are very stable now.

I think the trick seems to be to get rid of any moisture first, dry the
Iron out and make sure you remove every trace of loose rust. Then the
solution will be better 'absorbed'. The thing to remember is that if the
moisture can be absorbed so can the Sodium Hydroxide solution!, given
enough time I think it will treat pretty well any size of Iron.

One note of caution though don't use a 'brass wire' brush to brush off
the rust, I did this and ended up with a Copper/Brass coating on the
meteorite!!=20

There was some sort of electrolytic reaction with the copper in the
brass, the Iron looked like it was made of gold! It brushed off ok
though when I used a steel brush - phew!.

Mark



-----Original Message-----
From: Bob King [mailto:lakewind_at_infionline.net]=20
Sent: 11 March 2004 14:17
To: mark ford
Subject: RE: [meteorite-list] AD:Not a happy 'Campo'

Hi Mark,
Thanks for the suggestion. Indeed I have tried this method on some iron=20
and stone slices with good results so far. I didn't consider doing it
with=20
the Campo because it's so scaly plus I wondered -- how deeply will the=20
sodium hydroxide really penetrate into a big chunk of iron? Maybe I=20
should give it a try. What's the largest iron you've done this to?
Best regards,
Bob=20

Subject: RE: [meteorite-list] AD:Not a happy 'Campo'
From: "mark ford" <markf_at_ssl.gb.com>
To: <meteorite-list_at_meteoritecentral.com>
Date sent: Thu, 11 Mar 2004 09:23:36 -0000

>=20
> On that note:
>=20
> I have tried all sorts of exotic anti-rusting methods but definitely
the
> best is :=20
>=20
> Brush off all the rust with a wire brush, mix some methylated spirits
> with Sodium Hydroxide (caustic soda) (about 3 Table spoons to 1 pint)
> mix and soak the iron in it for at least a couple of weeks. Seems to
> halt the oxidization nicely!=20
>=20
> Smaller Irons respond better than very large ones, probably because it
> takes time for the solution to penetrate.
>=20
>=20
> Mark
>=20
>=20
>=20
> =20
>=20
>=20
> -----Original Message-----
> From: Bob King [mailto:lakewind_at_infionline.net]=20
> Sent: 10 March 2004 14:09
> To: meteorite-list_at_meteoritecentral.com
> Subject: [meteorite-list] AD:Not a happy 'Campo'
>=20
>=20
> Hi folks,
> I've got a rusting Campo del Cielo iron meteorite here that originally

> started off at 1050g but has been on the meteorite equivalent of the=20
> Atkins diet so now weighs closer to 1 kilo. After a wire brushing it
> still=20
> looks OK but plan on giving this one some TLC (or sodium hydroxide) if

> you want to arrest its condition and make it a fully-functioning
member=20
> of your collection. Please make me an offer. I'll return all replies.=20
> Thanks for your intervention ;-)
> Bob
>=20
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>=20
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Received on Thu 11 Mar 2004 10:50:49 AM PST