[meteorite-list] Rust on iron meteorites : new method ?

[M come Meteorite Meteorites]

where is possible found NaOH? Here in Italy the prices
its exaggerated, want 100 Euro for a 50g bottle...


Matteo

--- Marcin Cimala <marcin at meteoryt.net> ha scritto: 

> > So I´m very sceptical!
> >
> > Ingo
> >
> > P.S. Let me know the results (also in a long time)
> Pierre.
> 
> 
> This could be best example. Dronino.
> My 5kg endpiece was cleaned in water and NaOH. Then
> it was cut on EDM and
> cooled by mixture of water and oil (and slices
> usually lie in factory for 1
> days before I take them). Then I etched them, clean
> in water, then in
> alcohol.
> They rust ? No.
> 
> Ofcourse not every meteorite is the same. My
> mundrabillas are stable but I
> still have one endpiece that rust all the time. It
> was re-etched 3 times
> now. Can't win. Small rust in the same 2 places.
> Just bad specimen.
> 
> Morasko "ruster" ? So why my 2 big endpieces without
> any protection are
> stable ? I cleaned 5kg endpiece using
> electrochemical method for seweral
> days (water + NaOH). Then clean in alcohol and
> secured by Balistol. The same
> to slices cut from 6kg specimen. All was in cold
> room only with Balistol as
> protection. Stable. And also was cut on EDM and
> cleaned in water after
> etching.
> 
> And most of this specimens I have etched months ago.
> So Im sure that they
> are stable and can guarante this.
> 
> Some years ago I was panicked when I must work with
> "rusters" like my 6kg
> Nantan from eBay that I cut on my saw for 7 hours
> (in 2 days). It was all
> the time in water becouse it can't be removed from
> saw before cutting end.
> Status after 2 years ?
> Stable. 100% on etched surface and 85% on "crust"
> surface. But it have
> weathered rust outside and this is why there are
> bubbled of red water on
> some places. Now Im woking on it to remove rust and
> make it pretty silver
> from outside. But its stable. No rust, only drops of
> water.
> 
> So Im very calm in using water in meteorites. In a
> short time ( minutes).
> Only sometimes hours are secured (f.e. cutting)
> 
> -----[ MARCIN CIMALA ]-----[ I.M.C.A.#3667 ]-----
> http://www.Meteoryt.net            
> marcin at meteoryt.net
> http://www.PolandMET.com       marcin at polandmet.com
> http://www.Gao-Guenie.com      GSM +48(607)535 195
> --------[ Member of Polish Meteoritical Society
> ]--------
> 
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M come Meteorite - Matteo Chinellato
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