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

From: Lars Pedersen <lbp_at_meteoritecentral.com>
Date: Tue Feb 8 16:16:54 2005
Message-ID: <002c01c50e23$7f4faf20$9f00a8c0_at_star1>

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/
>> > > ______________________________________________
>> > > Meteorite-list mailing list
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>> > >
>>
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> =====
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Received on Tue 08 Feb 2005 04:16:42 PM PST