Metal finishing Q&As since 1989
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Rust-like stuff in nickel-rion electroplating
I got a problem in electroplating nickel-iron alloy. The sloution was made out of NiSO4, FeSO4, H3BO3, Saccharin, and SDS. After well mixed for one day, iron rust-like stuff appeared on both filter paper while filtering and wall of the container. What is it? Does it affect the Ni-Fe deposit? I appreciate any idea!
- Baton Rouge, Louisiana
You are forming ferric hydroxide (or hydrous ferric oxide, or a similatr species). You should try not to stir "too well" (do not draw a lot of air into the solution), in order to minimize oxidation of the ferrous ion. Make sure that the pH is about 3 or less while you make the solution.
If possible, operate your bath with continuous filtration. You will always have some ferric ions in this bath, but large amounts lead to decreased current efficiency, increased stress, and possible loss of brightness. Continuous filtration and good pH control keep the concentration of ferric ions and ferric compounds particles at a reasonable level.
I.B.M. - Yorktown Heights, NY, U.S.A.
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