You will almost certainly get some attack on the Brass, as it is an alloy of
Copper and Zinc, and Zinc is attacked by hot water....

Why did you add the thiourea to your plating bath, suspect you might get
better plating with out it...or was it an immersion plate?  If so, it is
probably so thin that all of the Tin has alloyed to the Copper Tin
intermetallic, and it is time to start over.

Rudy Sedlak
RD Chemical Company

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