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Why do we get low phosphorous electroless nickel with basic bath and high phosphorous with acidic bath?

Hi,
What is the mechanism for the formation of low phosphorous with basic bath and high phosphorous with acidic bath. In electroless nickel plating if we are using acidic PH we are getting low phosphorous coatings and opposite for the basic bath.What is the mechanism behind this thing.

Madhava Rao
- Chennai,Tamilanadu
March 25, 2010

You can look at it a few different ways, but it basically all boils down to the fact that there is a relationship between the %P that will codeposit and the plating rate. Faster plating rates will include a lower %P and slow rates will plate a higher %P. When you alter the pH of the bath, you change the plating rate. In order to keep the %P as constant as possible, you need to keep the rate as constant as possible which isn't terribly easy to do. Your chemical vendor should be able to help you.

Jon Barrows, MSF, EHSSC
Independence MO
March 26, 2010

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