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bronze and Ni-Cu alloys for seawater

bronze and Ni-Cu alloys for seawater

bronze and Ni-Cu alloys for seawater

(OP)
We are looking to replace some titanium and stainless parts with a lower cost / easier to source material and I was exploring 651 silicon bronze, aluminum bronze, and 70-30 and 90-10 copper nickel alloys.  There are two applications that are of primary importance:
(1) a lead screw (30 PSI tensile/compression) exposed to salt spray.
(2) a stationary non-structural piece (electronic housing).  

The screw can have anode protection installed but the electronic housing cannot (limited exposed surface).  On the latter the reduction of bio-fowling is as important as corrosion as this is a set and forget device.  Any suggestions based on experience and costs?

thanks

RE: bronze and Ni-Cu alloys for seawater

If you really want seawater resistance you are looking at NiAlBronze or 70/30.  The other alloys will sort of work, but nothing like a 6% Mo stainless or Ti.

You won't save much money.  One advantage of the Cu based alloys is the biocide effect.  As long as you are allowed to have a release of Cu ions you can take advantage of this.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: bronze and Ni-Cu alloys for seawater

(OP)
any particular grade of Ni Al Bronze?  I was looking at C62300 and C95500 initially.

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