Interesting - I take it that this "bronze" cladding is far from a simple
bronze alloy and has zinc in it as well as tin ?
Historically (pre WW2) it was practice in shipyards (admiralty brass
fittings) to whitewash brass and bronze castings before any heat
treatment, to reduce this dezincification. Although dezincifiation is
generally thought of as simple sublimation owing to the heat, it seems
there's a chemical aspect to it as well and keeping oxygen away will
If you are sure the bronze you have is a zinc bearing bronze, you might try
to create a zinc partial pressure in your heat treat chamber by loading it
with some pure zinc before you put your zinc clad part in there..
you say its clad do you know the cladding process ???
just be careful if it was brazed on you don't want to melt the braze if
or maybe you create some other type of barrier, like nickel plate that you
would remove later !!
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