We have oxidized Ni that we are unable to plate again with another layer of Ni (two stages of plating is neccesary for the process). The oxidized Ni is on small areas, 50micron diameter. We tried hot H2SO4 for short time but it didn't help. We can't use alkalic environment I saw your thread number 9459, but it didn't help.
What else can we try?
Moshit Yaskin_Harush - Haifa, Israel ^
Try Nitric acid:Hydrochloric acid 3:1 (Aqua Regia). Failing that, add 5% by vol conc Hydrofluoric acid (it works very well on high nickel superalloys such as Inconels and nimonics).
John Tuohy - Ireland ^
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