News of a water storage tank that is bactericidal - e.g. to E.Coli
within 48 hours: brass!
British researchers joined with Punjab U researchers to check the
supposition that the Indian tradition of carrying water in mutkas
(brass pots) was beneficial - which confirmed the suspicion, given a
dwell time of 48 hours plus.

The action stems from a low copper leaching rate out of the container.
The copper level in the water is extremely low and safe - in fact,
only a fraction of the recommended intake.

[New Scientist, 9 April 2005, p.14]

Brian Whatcott Altus OK

But what about the zinc? Also safe levels?

"BW" == Brian Whatcott writes:

BW News of a water storage tank that is bactericidal - e.g. to E.Coli
BW within 48 hours: brass!
BW British researchers joined with Punjab U researchers to check the
BW supposition that the Indian tradition of carrying water in mutkas
BW (brass pots) was beneficial - which confirmed the suspicion, given a
BW dwell time of 48 hours plus.

BW The action stems from a low copper leaching rate out of the container.
BW The copper level in the water is extremely low and safe - in fact,
BW only a fraction of the recommended intake.

BW [New Scientist, 9 April 2005, p.14]

BW Brian Whatcott Altus OK

--
C++: The power, elegance and simplicity of a hand grenade.

On 18 Apr 2005 10:39:57 +0200, Ole-Hjalmar Kristensen
wrote:

But what about the zinc? Also safe levels?

"BW" == Brian Whatcott writes:

BW News of a water storage tank that is bactericidal - e.g. to E.Coli
BW within 48 hours: brass!
BW British researchers joined with Punjab U researchers to check the
BW supposition that the Indian tradition of carrying water in mutkas
BW (brass pots) was beneficial - which confirmed the suspicion, given a
BW dwell time of 48 hours plus.

BW The action stems from a low copper leaching rate out of the container.
BW The copper level in the water is extremely low and safe - in fact,
BW only a fraction of the recommended intake.

BW [New Scientist, 9 April 2005, p.14]

BW Brian Whatcott Altus OK

The article did not consider zinc. It would make an active
electrolytic couple, I'd think?

Brian W

"BW" == Brian Whatcott writes:

BW On 18 Apr 2005 10:39:57 +0200, Ole-Hjalmar Kristensen
BW wrote:

But what about the zinc? Also safe levels?

"BW" == Brian Whatcott writes:

BW News of a water storage tank that is bactericidal - e.g. to E.Coli
BW within 48 hours: brass!
BW British researchers joined with Punjab U researchers to check the
BW supposition that the Indian tradition of carrying water in mutkas
BW (brass pots) was beneficial - which confirmed the suspicion, given a
BW dwell time of 48 hours plus.

BW The action stems from a low copper leaching rate out of the container.
BW The copper level in the water is extremely low and safe - in fact,
BW only a fraction of the recommended intake.

BW [New Scientist, 9 April 2005, p.14]

BW Brian Whatcott Altus OK

BW The article did not consider zinc. It would make an active
BW electrolytic couple, I'd think?

BW Brian W

Yes, I was just thinking that brass is an alloy of copper and zinc, so
we should expect zinc ions in the water as well. Anyway, it's probably
not a problem, since brass pots have traditionally been used.

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
C++: The power, elegance and simplicity of a hand grenade.

On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

On Tue, 19 Apr 2005 22:38:24 -0400, Rodney Myrvaagnes
wrote:

On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."


Ole has in mind the copper leachate from monel, I expect. Have
hulls been copper-clad and stood up to marine growth?

Brian Whatcott Altus, OK

Because its 90-10 Cu-Ni

In article , Rodney
Myrvaagnes wrote:

On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

It 66% Ni, 30% Cu, , some Fe, Mn and traces of others, depending on
the version.


Rich Hampel wrote:
Because its 90-10 Cu-Ni

In article , Rodney
Myrvaagnes wrote:


On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:


This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--

Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

On Wed, 20 Apr 2005 03:00:07 GMT, Brian Whatcott
wrote:

On Tue, 19 Apr 2005 22:38:24 -0400, Rodney Myrvaagnes
wrote:

On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."


Ole has in mind the copper leachate from monel, I expect. Have
hulls been copper-clad and stood up to marine growth?

Copper clad is about the earliest antifouling. Available copper is
also the active ingredient in a lot of bottom paint.

But I don't believe the copper in monel is available. If it were, the
monel would not have its non-corrosive property.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

On Wed, 20 Apr 2005 20:39:25 GMT, Rich Hampel
wrote:

Because its 90-10 Cu-Ni

In article , Rodney
Myrvaagnes wrote:

On 19 Apr 2005 11:40:44 +0200, Ole-Hjalmar Kristensen
wrote:

This reminds me of a pretty ideal alloy for ship plating : monel.
Corrosion resistant, strong, and no need for antifouling paint, I
would think. The price would probably be prohibitive.

--
Why no need for antifouling? Monel is pretty nonreactive. How would it
keep things from growing? I'd expect a grand barbacle crop quite soon.


It could be all copper, but if it is locked in a matrix that makes it
nonreactive it could just as well be anything else nonreactive, and it
wouldn't have antifouling properites.

It has to be _available_ copper. To a barnacle, monel would be just
like stainless steel, or gelcoat.

Antifouling works by poisoning the boundary layer, not by magic.

The trick is to poison the boundary layer without poisoning everything
else--hence the objections to organo-tin.



Rodney Myrvaagnes NYC J36 Gjo/a

"WooWooism lives" Anon grafitto on the base of the Cuttyhunk breakwater light