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Blackening when plating indium over silver
We have a requirement to plate indium over silver, diffuse, then black oxide. We are getting "blackening" of the high current density areas of the diffused indium-silver when black oxided. Even happens when all baths are new. Any ideas?
aircraft engines - Indianapolis, Indiana
I have seen silver become almost a metal sponge in high current density areas at a cd too high for the formulation. I suspect that you are absorbing blackening agents into this area more than the rest of the plate.
- Navarre, Florida
An interference color shift from the surface roughness or texture may only be apparent after it is darkened.
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