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Hydrogen Absorption on Dumet wire in Nickel plating by Nickel Sulphamate Bath

WE are developing Nickel plated dumet wire for metal to glass sealing at high temperature. This wire shall be used in the production of signaling lamps.The absorbed hydrogen on wire in plating process (Nickel Sulphamate) is released during high temperature glass sealing and appears as cloud of bubbles in glass pinch.

Can any body through some light on how to remove or control process in such a way that hydrogen absorption is minimum.

Kamal Baid
Development Engineer - Jaipur, Rajasthan, India
2007

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2007

The wire does not absorb that much hydrogen, because the plating is nearly 100% efficient. The acid etch prior to plate definitely could cause the problem. Do some lab and floor work to see if the etch cycle can be shortened and use an inhibited acid.
The simplest route would be to bake the wire after plate and before use.
Being a glass blower in college, try a test using unplated wire and see if you do not still get some bubbling. The cut end will bubble.(some)

James Watts
- Navarre, Florida

Preheat it before use.

Guillermo Marrufo
Monterrey, NL, Mexico
2007