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

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Tue Feb 8 08:05:47 2005
Message-ID: <20050208130525.69113.qmail_at_web50105.mail.yahoo.com>

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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=====
M come Meteorite - Matteo Chinellato
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Received on Tue 08 Feb 2005 08:05:25 AM PST