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topic 11420

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 Tai
University of Technology Malaysia - Skudai, Johor, Malaysia


 

Yes, proprietaries are the way to go with electroless nickel. There are numerous suppliers available.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

There are a number of commercial suppliers of all three baths you mention.

James Totter
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 Sulfate 30 g/L
Sodium hypophosphite 30 g/L
Sodium pyrophosphite 60 g/L
Thiourea 3 mg/L
pH 9
Temperature 85 deg C

What other combinations that can produce low and medium Phosphorus deposition?

Siew Fong Tai
University 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 Marrufo
Monterrey, NL, Mexico



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