[Public-list] bronze rudder post replacement

[George Dinwiddie]

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.
                'The Middle' by Ogden Nash
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