What is black-zinc plating?
Q. What is black-zinc plating? G.H.
A. I answered a similar question regarding black zinc plating way back in the “dark ages” of this column. Here in an edited version is what wrote at that time:
“I am not aware of any black-zinc-plating process. What you are probably looking for is a zinc deposit followed by a black chemical conversion coating. You can find some good basic information on the chemical conversion process by searching pfonline.com. You did not specify why you need a black-zinc coating, so I should point out to you that other types of black coatings are available. Black-nickel and chromium-plating processes are available. In addition, black finishes can be applied on ferrous materials using black-oxide formulations at elevated temperatures. There are newer blackening processes that can be used at room temperature.” Another site containing information is Finishing.com.
An overview of precious metal electroplating processes.
White Bronze, Copper-Tin-Zinc Tri-metal: Expanding Applications and New Developments in a Changing Landscape
This paper deals with the renewed interest in applications for white bronze tri-metal (Cu-Sn-Zn alloy).
Getting the properties you paid for...