[meteorite-list] Water cutting question

From: Michael Mulgrew <mikestang_at_meteoritecentral.com>
Date: Tue, 20 Nov 2012 11:17:37 -0800
Message-ID: <CAMseTy1D3HzRqCefgUam=QME=+pJMVErWwmQkQ7D7GNB0EzYzw_at_mail.gmail.com>

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 <raremeteorites at 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 <agee at unm.edu>
> To: meteoritelist meteoritelist <meteorite-list at 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: agee at unm.edu
> http://meteorite.unm.edu/people/carl_agee/
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Received on Tue 20 Nov 2012 02:17:37 PM PST