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Brass casting surface pitting problem


#1

Hello all,

I recently cast some brass medallions, the finished items had
surface pitting, the process was lost wax casting, I did the burnout
with a batch of rings which were cast in Sterling Silver, all the
sterling silver items cast perfectly.

When I melted the brass a thick yellow smoke issued from the melt, I
think maybe the zinc burned out causing the problem. The brass used
was new brass rod, no rubbish in the melt, any advice re flux etc
would be appreciated.

Thanks Ivan.


#2

Ivan,

Switch to bronze (copper tin alloy)

Brass (copper, zinc and others) doesn’t cast well, that yellow smoke
sure sounds like some cadmium in the alloy. Not at all good for you
and the zinc not much better.

JeffD
Demand Designs
Analog/Digital Modelling & Goldsmithing
http://www.gmavt.net/~jdemand