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10/1/2005

Electroless Nickel on Titanium

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Quesiton: How can we deposit electroless nickel on titanium parts?

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Quesiton:

How can we deposit electroless nickel on titanium parts? F. A.

Answer:

The key to getting a good adhesive layer of electroless nickel on titanium is proper preparation of the titanium substrate. In the book, Electroless Nickel Plating, Wolfgang Riedel, ASM International, www.asm-intl.org, the following procedure is suggested:

  1. Vapor degrease
  2. Blast using 220 mesh alumina at four bar
  3. Rinse thoroughly
  4. Etch using 400 g/liter HNO3 + 5 g/liter HF for five minutes
  5. Rinse thoroughly
  6. Activate using a Wood’s nickel strike
  7. Rinse thoroughly
  8. Electroless nickel plate

The important thing to remember is that titanium forms a rather tenacious oxide on the surface almost instantaneously when exposed to the atmosphere. Hence, the steps in the above process must be performed rapidly.

 


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