[meteorite-list] dronino (in)stability: a solution ?
From: M come Meteorite Meteorites <mcomemeteorite2000_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:56 2004
I have just sent to Steve a piece of Dronino for text
the method antyrusty, I hope he find a good method.
--- John Gwilliam <jkg_at_theriver.com> wrote:
> Rust Sufferers,
> You might consider using Steve Schoner's tried and
> true sodium hydroxide
> process. I had several slices of old Campo that
> would rust no matter how
> may times I polished them or how dry I kept them.
> Then, two years ago, I
> used the sodium hydroxide process and the slices
> have been rust free ever
> since. One of the slices sits in a metal pan out in
> my garage where it is
> subject to the heat and humidity and there is
> absolutely no rust on it.
> John Gwilliam
> At 06:21 PM 9/16/03 +0200, Zelimir Gabelica wrote:
> >Hello Steve, Matteo, List,
> >Dronino seems to be very versatile to rusting
> >-I got a small slice from Sergey Vasiliev in May
> 2003 with not any rust
> >problem so far (now about 4 months after).
> >-I purchesed 2 other slices in Ensisheim (June 21)
> from Serguei (Serge)
> >Afanasiev and one month after they both were fully
> covered with rust,
> >basically all around the silicate inclusions.
> >- I purchased another small slice from Vasiliev in
> Ensisheim and today it is
> >just as fresh as in June....
> >Apparently either every Dronino piece is
> intrinsicaly different or it is a
> >problem of cutting method and precautions taken
> after cutting, but probably
> >not a storage problem because all the 4 slices were
> stored in the very same
> >drawers and boxes, with just, as (poor) protection,
> a silica bag in between
> >the cotton wool and the plastic box bottom.
> >Having nothing to loose with Serge's slices and not
> having on hand any
> >reliable recipe nor chemicals, I directly tried the
> first commercial product
> >I found in a Department Store (in Belgium).
> >It is a tube of compact (wax-like) "paste" named
> "STRAHLDUR" (German brand
> >?) sold for a few euros as a "mirror finish without
> polishing" for current
> >domestic houseworks...
> >Operatory conditions, as written on the tube and
> box, in 6 languages (also
> >in italian, Matteo!), suggest to "apply Strahldur"
> on a WET sponge for
> >"stainless steel, copper, brass, tin, chromium,
> aluminum, but also plastics,
> >enamel, glass, tiles bathroom fittings, sink,
> hot-plates, oven grill,
> >toaster, kettle, IRON, cutlery, resopal kitchen
> furniture, refrigerators,
> >window frames, garden furniture, and much much
> more"...moreover: "it removes
> >RUST from chrom plated parts and dirt from wheel
> >It so continues:
> >"Wash the object (with a wet sponge) and dry (wipe
> >Any warnings ? Not really. They write: "Strahldur
> contains NO ACID and is
> >gentle to the skin"...
> >Composition ? "contains "mineral polish" (?),
> emulsified paraffin, natural
> >soap, "cleansing raw materials" (?)...and a "fresh
> orange fragrance"
> >(probably to remove tha latest doubts of a
> semi-convinced housewife"...).
> >As a chemist, I realized that the paste could prove
> relatively harmful to
> >most of metallic objects. And the metals cited
> above (including rust!) can
> >mostly be involved in a meteorite as well!
> >Without preliminary trials on any other meteorite,
> I just then removed most
> >of the superficial rust from my 2 dirty Droninos
> with a razor blade (dry
> >conditions) and then applied Strahldur with a DRY
> cloth (I IGNORED wetting
> >for obvious reasons) for about 2 minutes, by gently
> rubbing all around the
> >slices. Then just gently polished with another soft
> cloth so as to recover
> >the initial mirror-brillant polish.
> >The slices immediately recovered their initial
> aspect and were mint again!
> >This treatment was performed 5 weeks ago and I just
> checked the 2 slices
> >today: perfect with not any trace of rust!
> (remember that rust appeared 1
> >month after purchase of the mint slices).
> >This can be a first step towards a solution of rust
> removing from our
> >polished iron slices and, in particular, Dronino.
> > I am however cautious and prefer waiting for more
> time but so far this kind
> >of simple treatment appears fairly promising.
> >I will, of course, keep you informed. But the
> message here can be that,
> >instead of using complicated and harm chemicals
> (such as preliminary I
> >wanted to use in a laboratory), it is perhaps
> preferable to put our faith
> >into very common cleaning products for housewifes.
> They are, by definition,
> >not dengerous, must be efficient and, especially,
> polyvalent, thus for a lot
> >if different uses, probably including meteorite
> cleaning, rust removing and,
> >possibly, further protecting through some film (my
> >I almost forgot.
> > I further tried this product to remove some rust
> spots from an etched iron
> >involving Widmannstätten pattern.
> >As all my Gibeons are "desperatly" stable, I tried
> to treat a slice of
> >SPEARMAN (Om IIIAB, Texas). Rust was immediately
> gone but the W pattern
> >remained untouched!
> >This is (for me) an even more promising result as
> it was always a nightmare
> >for me to have to remove rust from a slice through
> some chemical (acid) and
> >then re-treat with Nitol (or FeCl3) to recover the
> W pattern.
> >Glad if this helps and happy to answer any further
> question or comment,
> >All the best,
> >At 04:51 16/09/03 -0700, Steve Arnold wrote:
> > >Hello again list.Could someone please let me know
> how stable the DRONINO
> > >meteorite is?I mean versus campo, nantan, and
> some other iron pieces.I am
> > >trying to decide whether or not to buy some.I,
> like mike blood like to
> > >collect only stone or stoney-irons, but like to
> take a chance on a good
> > >stable iron piece.Let me know.
> > >
> steve arnold
> >On Tue, 16 Sep 2003 04:58:39 -0700 (PDT), Matteo
> >Dronino have high problem with rust, I am under
> >a method for stop this.
> >Prof. Zelimir Gabelica
> >Groupe Sécurité et Ecologie Chimiques (GSEC) -
> >3, rue A. Werner
> >F-68093 MULHOUSE Cedex, FRANCE
> >Tel: +33 (0)3 89 33 68 94
> >FAX: +33 (0)3 89 33 68 15
> >e-Mail: Z.Gabelica_at_uha.fr
> >Meteorite-list mailing list
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Received on Tue 16 Sep 2003 01:06:52 PM PDT