[meteorite-list] Clear Coat Iron Slices?

From: mark ford <markf_at_meteoritecentral.com>
Date: Wed Mar 15 18:10:42 2006
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31508B63_at_s-southern01.s-southern.com>

Hi Walter et al,

Yes I found early on that coatings don't seem to be all that effective
as they are not actually airtight, moisture is trapped in but can get
out but the air can, it's basically the water, oxygen, chlorides and
salts inside the rock which react with water vapor to cause rusting, A
thin wipe over with gun oil or lithium grease on iron slices (then wipe
it clean) is about as good as it gets, unless you start treating them
with sodium hydroxide solution or sodium carbonate solution or the
aluminum electrolytic method that is doing the rounds. These treatments
work really well by neutralizing the salts inside the rocks etc,

I did a trial on some steel squares sat in a small amount of water a few
years ago, and by far, the Li Grease coated iron survived the longest,
the spray coating broke down after a few months and rust spots appeared,
the untreated one went rusty within days!

Campos seem to respond especially well, I have many kilos of campo in my
collection that are as mint as the day they arrived after the NaOH
treatment.

And as always *gloves when handling them* :( , and keep desiccant (such
as silica gel in the cabinet to keep the air dry, but don't forget to
recharge/renew it regularly!.


Best
Mark Ford


-----Original Message-----
From: meteorite-list-bounces_at_meteoritecentral.com
[mailto:meteorite-list-bounces_at_meteoritecentral.com] On Behalf Of Pete
Pete
Sent: Tuesday, March 14, 2006 3:54 AM
To: branchw_at_bellsouth.net; meteorite-list@meteoritecentral.com
Subject: RE: [meteorite-list] Clear Coat Iron Slices?

Hi, Walter,

About a year ago I bought a Dronino that the seller had coated with a
urethane-type substance, and I can tell you that there are a few
definite
drawbacks from this procedure:

-Underneath the coating, lawrencite disease has started up and in many
places broken through the seal. I'm sure that it's progress has been
slowed
because of the coating, but short of using a harsh chemical to remove
the
shell, likely damaging the meteorite in the process, treatment is
impossible.

-The coating has a subtle yellowish hue, and under the microscope it
becomes
vey annoying.

-Personally, I find the direct contact with a meteorite aesthetically
pleasing.

Cheers,
Pete




From: "Walter Branch" <branchw_at_bellsouth.net>
To: "Meteorite List" <meteorite-list_at_meteoritecentral.com>
Subject: [meteorite-list] Clear Coat Iron Slices?
Date: Sun, 12 Mar 2006 20:52:14 -0500

Hello Everyone,

I was wondering if anyone had an opinion on coating iron slices with
some
type of clear coat to help prevent rust? Pros? Cons?

Would driving off as much water as possible then applying the clear coat

work? Are harmful gasses trapped by the process?

Any discussion or opinions would be appreciated.

-Walter Branch
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Received on Wed 15 Mar 2006 04:11:03 AM PST