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High/Medium/Low Phosphorus Electroless Nickel Bath
I need to plate Electroless Nickel coating onto Copper substrate. The coating must be with high (>10%), Medium (8-10%) and low (<4%) phosphorus content. What are the bath combinations that produce such coating? Or is there any commercial bath supplier?
Siew Fong TaiUniversity of Technology Malaysia - Skudai, Johor, Malaysia
Yes, proprietaries are the way to go with electroless nickel. There are numerous suppliers available.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
There are a number of commercial suppliers of all three baths you mention.

James Totter, CEF
- Tallahassee, Florida
I've tried the following combination of EN plating solution. It is said to produce low Phosphorus content(2%). Somehow I've got 12%. Why is it so?
Nickel sulphate 30 g/L
Sodium hypophosphite 30 g/L
Sodium pyrophosphite 60 g/L
Thiourea 3 mg/L
pH 9
Temperature 85 °C
What other combinations that can produce low and medium Phosphorus deposition?
Siew Fong TaiUniversity of Technology Malaysia - Skudai, Johor, Malaysia
Siew:
Go back to basics. You belong to a University. Get some good books on the subject. I personally recommend the Metals Handbook, Ninth Edition, Volume 5 Surface Cleaning, Finishing and Coating by ASM and The Properties of Electrodeposited Metals and Alloys Second Edition by AESF
Guillermo MarrufoMonterrey, NL, Mexico
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