Note: forwarded message attached.
__________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com
--- Begin Message ------ Tom aka James Knudson <[EMAIL PROTECTED]> wrote: > Hello List, Have any of you tried VCI with Brahin, > if so how does it work? > Thanks, Tom > Peregrineflier <>< > The proudest member of the IMCA 6168 Tom, I really doubt that any VCI would work as one still has in badly rusing irons and pallasites the hydroscopic iron-nickel chlorides to deal with. As long as there is moist air they will suck that moisture out and cause greenish brown blebs of liquid on the specimen. And that will then progress into the rust cancer. This is exactly what happens on cars with rust cancer. Chlorine from salt is the problem. Once that chlorine hitches a ride on Fe... It all over. I have found no other solution that can remove chlorine from iron meteorites. However, chlorine has a much greater affinity to sodium than to iron, and if enough sodium is present in solution that is where it will go, to the sodium. And NaCl disolves in water, hence the soaking afterwards. So if you can lock that chlorine to the salt form as in NaCl, it can be washed away in repeated rinsing in distilled water (chlorine free) and the problem will go away too. Steve Schoner/ams > ----- Original Message ----- > From: Sterling K. Webb <[EMAIL PROTECTED]> > To: Martin Altmann <[EMAIL PROTECTED]> > Cc: <[EMAIL PROTECTED]> > Sent: Tuesday, September 30, 2003 5:05 PM > Subject: Re: [meteorite-list] Brahin stability > > > > Hi, Martin, > > > > I bought a 40 gram slice about two years ago > from Koutyrev/finmet, who > > advertised that the slicing, etc. was done without > any contact with water. > (This > > was before any "new" method.) Beautiful. I put it > in an acrylic display > box. > > Three weeks later, it was rusty everywhere. I > processed it according to > Steve > > Schoner's method for two weeks, polished it off, > baked it in an oven, put > it in > > another acrylic display box which I sealed > thoroughly. Three weeks later, > it was > > rusty everywhere. > > I repeated the chemical treatment, but for a > much longer time. The > result > > was the same, a rusty Brahin, which is now slowly > disintegrating. I think > it has > > another year or two to go before all the iron is > gone and I have a box of > > expensive olivine crystals. > > > > > > Sterling K. Webb > > > ------------------------------------------------------------------------ > > Martin Altmann wrote: > > > > > Hi again, > > > > > > does anyone has experiences with the Brahins > from Koutyrev/finmet? > > > He praises them to be totally stable for years > (you can put in salt > > > water..), due to a new method. > > > I wonder, how he could know that his method > helps, as he uses it > obviously > > > not longer than a year or so (as far as I > observed his auctions). > > > > > > >From one of Serge's pieces I grinded off (dry) > the glue, for testing, > what > > > will happen. It started immediately to develope > rust traces and after 2 > > > months, it was so swollen (lawrencite?) that I > hid away for not getting > hurt > > > in a potential explosion. > > > > > > Martin > > > > > > ______________________________________________ > > Meteorite-list mailing list > > [EMAIL PROTECTED] > > > http://www.pairlist.net/mailman/listinfo/meteorite-list > > > > > > ______________________________________________ > Meteorite-list mailing list > [EMAIL PROTECTED] > http://www.pairlist.net/mailman/listinfo/meteorite-list __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com
--- End Message ---
