Pebbled Surface on bronze
Q. We have been approached by a customer who wants to produce a pebble-like surface on a bronze casting. Can you give us any information on how this can be done? C.P.
A. I’m not aware of any simple one-step process for doing this. Typically, if you are looking to have a textured or grain-like appearance on the surface, a multistep process is required. The first step requires the application of a plating stop-off to the surface in the pattern that you require.
The second step would consist of etching the unprotected areas with a suitable etchant such as nitric acid, ferric sulfate/sulfuric acid or a suitable formulated product. The stop-off would then be removed.
The final step would involve restoring the luster to the surface of the part. This could be done by a bright dipping or buffing of the surface. The last step would be to plate the part with the desired metal.
Our expert, Art Kushner, says yes, you can color stainless steel, but it is not a process that is typically performed in a plating shop. Read more about his answer.
A primer on this inexpensive and highly efficient process.
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).