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Chrome plating electroless nickel plated parts

Is it possible/feasible to chrome plate brass parts that have been previously subjected to electroless nickel plating?

Royce Sorensen
- Eau Claire, Wisconsin USA

You can plate Cr over EN but the EN has to be active. Also the %P content has a significant effect on the activity of the EN the higher the P the more passive the EN.

After plating I would recommend a good Ni activator or Woods Ni strike.

George Shahin
- Rock Hill, South Carolina

Royce,

After En you should clean the part cathodic in a at least for 2 minutes with a clean electrocleaner. Use Pumice [linked by editor to product info at Amazon] if you need after that. activation in 10-percent hydrocacid solution for 1-2 minutes. finish with a clean 60-percent sulphuric acid 4 voltage for 15-20 sec. Start the chrome plate with low current 0,52 voltage for 5 minutes. After that go up to the normally current density you plate chrome.

good luck

Anders S

Anders Sundman
surface finishing engineer
Sweden

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