Pete and list, Unfortunately the method you use does not effectively de-gas water, as exposure to the atmosphere will allow atmospheric gasses to continue to dissolve into solution; it is the atmospheric gasses that cause water to be corrosive. To de-gas water you can:
- Boil it - Sonicate under vacuum - Use a vacuum degasser - Bubble He through it - Etc. But unless you store your degassed water in an air-tight container gasses will begin to dissolve back into solution almost immediately. Michael in so. Cal. On Tue, Nov 20, 2012 at 1:47 PM, Pete Pete <rsvp...@hotmail.com> wrote: > > I do! > > I fill all my old distilled four litre jugs with tap water and let them sit > with the caps off for about seven days. > A chemist buddy of mine said it takes about 24 hours for any chlorine and > other gasses to dissipate, but with the narrow neck and relatively small cap > opening, to be prudent, after a couple of days I give it each jug a shake and > leave it again for a few more. > > Cheers, > Pete > >> From: mikest...@gmail.com >> Date: Tue, 20 Nov 2012 11:17:37 -0800 >> To: raremeteori...@yahoo.com >> CC: meteorite-list@meteoritecentral.com >> Subject: Re: [meteorite-list] Water cutting question >> >> Adam, Mike, Carl, and list: >> >> >> The main constituents in "pure" water that cause corrosion are >> dissolved gasses. Does anyone de-gas their cutting water? >> >> Michael in so. Cal. >> >> On Tue, Nov 20, 2012 at 10:43 AM, Adam Hupe <raremeteori...@yahoo.com> wrote: >> > >> > >> > Who knows what chemicals lurk in tap water? By purifying it, you are >> > removing the unknowns. I have >> > seen, for lack of a better term, Lawrencite disease creep up, especially >> > with tap water that contains chlorine which seems to accelerate the >> > problem. I have had no issues cutting with purified water as long as >> > the contact time has been minimized. I guess purifying it could make >> > the water more acidic but I also monitor the PH level and have not seen >> > much of a difference. >> > >> > Other alternative coolants such as mineral oil, pure ethyl alcohol or >> > kerosine do not appeal to me anymore, mainly due to fumes, ignition or >> > the smell left in the specimens. >> > >> > >> > Adam >> > >> > >> > >> > >> > ________________________________ >> > From: Carl Agee <a...@unm.edu> >> > To: meteoritelist meteoritelist <meteorite-list@meteoritecentral.com> >> > Sent: Tuesday, November 20, 2012 9:35 AM >> > Subject: [meteorite-list] Water cutting question >> > >> > I have been following the thread on cutting irons in water. My >> > question is, why distilled or purified water rather than tap water? I >> > was under the impression that purified water, i.e. ultrapure water, is >> > much more corrosive than mineralized water like spring water or tap >> > water. In fact, ultrapure water is so corrosive it is often used in >> > clean labs as a cleaning medium for surfaces. Also, the pharmaceutical >> > industry no longer uses stainless steel tubing for ultrapure water >> > because of corrosion -- they use Teflon or polyethylene instead I >> > believe. Wouldn't pure water be worse on iron oxidation than >> > "mineral" water? I can understand using pure water to cut down on >> > trace element contamination for geochemical srtudies, especially on >> > stones, but I don't see how this helps for keeping irons from rusting. >> > Also, while we are at it, what is the best blade for cutting irons? >> > >> > Thanks, >> > >> > Carl Agee >> > -- >> > Carl B. Agee >> > Director and Curator, Institute of Meteoritics >> > Professor, Earth and Planetary Sciences >> > MSC03 2050 >> > University of New Mexico >> > Albuquerque NM 87131-1126 >> > >> > Tel: (505) 750-7172 >> > Fax: (505) 277-3577 >> > Email: a...@unm.edu >> > http://meteorite.unm.edu/people/carl_agee/ >> > ______________________________________________ >> > >> > Visit the Archives at http://www.meteorite-list-archives.com >> > Meteorite-list mailing list >> > Meteorite-list@meteoritecentral.com >> > http://six.pairlist.net/mailman/listinfo/meteorite-list >> > ______________________________________________ >> > >> > Visit the Archives at http://www.meteorite-list-archives.com >> > Meteorite-list mailing list >> > Meteorite-list@meteoritecentral.com >> > http://six.pairlist.net/mailman/listinfo/meteorite-list >> ______________________________________________ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
