"J" == Jeff writes:

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

Yes, I think you are correct about the composition. An alloy with more
copper and less nickel, like the 90-10 Cu-Ni is from an antifouling
perspective, but it has lower strength. The amount of copper which
leaks from the surface also depends on the degree of passivation of
the surface. If it is in contact with mild steel, the electric
potential difference between the metals will lead to rapid passivation
of the fairly noble material. This inhibits the leaching of copper. If
I remember correctly, both 90-10 Cu-Ni and Monel has been tried for
cladding of offshore constructions. 90-10 Cu-Ni was the best
performer, and essentailly free of growth after several years when insulated
from the steel. I don't remember the amount of growth for the monel cladding.

Btw., I just found this link about a yacht built from Cu-Ni (not
monel):

http://64.90.169.191/applications/cu...boat_hull.html



J 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."

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