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#1 2006-05-24 04:51:38

c&c27dyc
Member

Dis-similiar metals

O.K., we've heard about the poor properties of combining Bronze and Brass - but - can anyone tell me if combining a Bronze thru-hull and valve with a black/grey iron 45 degree elbow is a poor combination? (meaning-could there be a corrosion issue at hand?)
Thanks
Dean M Baldwin
Morgan "D"
Mark III - Hull 516
Halifax, N.S.


Dean M Baldwin
Morgan "D"
Mark III - Hull 516
North Sydney, N.S.

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#2 2006-05-24 10:20:58

davidww1
Member

Re: Dis-similiar metals

Search message  for "Zinc anode" or "galvanic". I wrote a long piece about a conversation I had with a guy who knows a fair bit about the subject. Black iron and manganese bronze are fairly close, but most iron fittings are galvanized with zinc, which is a long way down the list and is thus sacrificial.

I know you're in cold water, which slows the reaction, but if I joined the two metals, I'd fret (and I don't like fretting). If I were you, I'd ask around and find out what the workboats do - that's probably the best option (but still inspect every year). The other thing you might do is ask Ralph Ainslie at DYC - he probably knows what the fishing and work fleet does.

David Weatherston
Towser, Toronto
C&C 27 Mk IV


David Weatherston
Towser, Toronto
C&C 27 Mk IV

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