[Public-list] bronze rudder post replacement

George Dinwiddie gdinwiddie at alberg30.org
Wed Oct 18 18:15:31 PDT 2006


Gord,

Do you remember the name of the proper alloy of Auminum Bronze?  Metal 
dealers often sell their offcuts on Ebay.  I've seen Aluminum Bronze, 
but never Silicon Bronze.

  - George

mainstay at csolve.net wrote:
> Hi there -
> 
> I agree with John - there are a myriad of varieties of bronze, as I  
> learned the hard way making lifeline stanchions.  Some are soft, some  
> are brittle, some will rust!  Silicon Bronze is hard and stiff, has  
> terrific strength and endurance.  Aluminium Bronze is even better but  
> costs a lot.
> 
> We had a shipment of Alum. Bronze stanchions made; I gave the maker  
> precise information about the alloy I needed.  Regardless, they used  
> another alloy (1/3 the price).  First I knew of the switch was a  
> concerned call from the schooner's skipper in Bermuda saying that the  
> new stanchions were 'bleeding red rust'.  How could this be?
> 
> I went on a crash course on alloys and chemistry.  Aluminium needs a  
> bit of iron  in the mix to help it do its thing with the copper... and  
> 5% Nickle to bind the iron.  Cheap alloys don't have any nickle.   
> Without the nickle the iron rusts... expensive lesson!  We had a new  
> set of 18 stanchions made and rushed out to the ship...the sat down  
> and had a talk with the foundry about 'saving money' and following  
> instructions...
> 
> Gord
-- 
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   When I remember bygone days                         George Dinwiddie
   I think how evening follows morn;            gdinwiddie at alberg30.org
   So many I loved were not yet dead,           http://www.Alberg30.org
   So many I love were not yet born.
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