AW: [meteorite-list] Is Brahin a ruster ?

From: mark ford <markf_at_meteoritecentral.com>
Date: Wed Feb 9 03:51:25 2005
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31244BC3_at_s-southern01.s-southern.com>

Lars,


Putting meteorites into acrylic blocks, doesn't seem to stop them rusting, there will always be residual moisture and salts in the matrix, you need to chemically treat it to have any chance of halting the corrosion. I put a slab of H Chondrite into resin several years ago and it immediately went brown like rust! - there must have been some reaction with the plastic.

Mark



-----Original Message-----
From: Lars Pedersen [mailto:lbp_at_privat.tdcadsl.dk]
Sent: Tuesday, February 08, 2005 9:17 PM
To: M come Meteorite Meteorites; meteorite-list_at_meteoritecentral.com
Subject: Re: AW: [meteorite-list] Is Brahin a ruster ?

Yes maybe it should be put into some kind of acrylic resin.

Does anyone know what to use, and how to do it.

It is a 530 gram full slice aprox. 21 x 17 centimeters.

Just a thin layer ?

Or a block like you sometine see seascales in a acrylic block ?

Best
Lars
----- Original Message -----
From: "M come Meteorite Meteorites" <mcomemeteorite2004_at_yahoo.it>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, February 08, 2005 2:05 PM
Subject: Re: AW: [meteorite-list] Is Brahin a ruster ?


> For me the unique method for save the pallasites from
> rusty is put this into a acrilic resin without air.
>
> Matteo
>
> --- J?rn Koblitz <koblitz_at_microfab.de> ha scritto:
>> Hi List,
>>
>> back in the 1980s, I got a large, beautiful Admire
>> slice. I kept it at low humidity and also added
>> corrosion inhibitor to the bag in which the slice
>> was wrapped in. During the first 10 years I checked
>> for signs of rust from time to time. It was okay, no
>> rust, very stable. So, I kept it alone (same storage
>> conditions) until one year ago, when I look at it
>> again. Well, the pallasite was in the state of
>> disintegration, heavily rusted, olivines pressed out
>> of the metal grid. What I want to say is, that even
>> after so long time of stability, one can never be
>> sure. I think, one has to check the state of such a
>> known ruster more often. If any sign of rust,
>> especially swallowing of olivine grains, one has to
>> start corrective actions immediately (e.g.
>> neutralization of acids, drying...). Rusting is a
>> self-accelerating process, once it has started. If a
>> meteorite is known as a ruster (like Brahin,
>> Brenham, Admire), be very careful!
>>
>> I am presently developing a special method of
>> treatment to remove all the salts (the source of the
>> mess) from such corrosion sensitive irons and
>> pallasite specimens. I hope, with such reatment,
>> then these rusters are sufficiently stabilized for
>> the time being.
>>
>> J?rn
>>
>>
>> > -----Urspr?ngliche Nachricht-----
>> > Von: Martin Altmann
>> [mailto:Altmann_at_Meteorite-Martin.de]
>> > Gesendet: Montag, 7. Februar 2005 23:35
>> > An: Lars Pedersen;
>> meteorite-list_at_meteoritecentral.com
>> > Betreff: Re: [meteorite-list] Is Brahin a ruster ?
>> >
>> >
>> > Hi Lars,
>> >
>> > Brahin is untreated a hefty ruster like Brenham.
>> > With two of the main suppliers of Brahin I made
>> the experience
>> > that Afanasjev (cometshop) did a good job in
>> varnishing his slices.
>> > My oldest slice from him I had for almost 7 years
>> without any problems
>> > and many others I had in stock for 2years and more
>> without
>> > developping a
>> > single trace of rust.
>> > Once I was curios, grinded off the varnish and the
>> slice
>> > started to rust and
>> > to swell within a few weeks.
>> >
>> > >From the other supplier Koutyrev (finmet) I know
>> only, that
>> > he advertized
>> > his slices in former times to be stabilized with a
>> "new
>> > method" and with the
>> > gimmick, that you can keep them even in salt water
>> without any effect.
>> > I never took from his Brahins, but heard from
>> several of my collector
>> > fellows as well as from some dealers too, that
>> they were
>> > indeed stable and
>> > goody-goody.
>> >
>> > To be sure, one should choose a member of the
>> > Eagle-Station-grouplet, with
>> > their 15%+ Ni, they should be the most stable ones
>> among all
>> > pallasites, but
>> > they are difficult to get and not even cheap...
>> >
>> > Cheers!
>> > Martin
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Lars Pedersen" <lbp_at_privat.tdcadsl.dk>
>> > To: <meteorite-list_at_meteoritecentral.com>
>> > Sent: Monday, February 07, 2005 8:52 PM
>> > Subject: [meteorite-list] Is Brahin a ruster ?
>> >
>> >
>> > > Hello All
>> > > Thanks for you show reports and poictures, I
>> enjoy them.
>> > >
>> > > I have just traded for a big fullslice of
>> Brahin.
>> > >
>> > > Is it a ruster ?
>> > > How do I prevent ?
>> > > etc. etc. ?
>> > >
>> > > Best
>> > > Lars
>> > >
>> --------------------------------------------------
>> > >
>> > > New meteorite forum:
>> > >
>> > > http://www.worldofmeteorites.com/
>> > > ______________________________________________
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>> > >
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Received on Wed 09 Feb 2005 03:48:06 AM PST