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topic 682

Plating as preparation for brazing


(1996)

We have some large panels (3'W X 8'L) that we need to wet with plating prior to brazing. Normally we would electrodeposit gold (0.0008"-0.001") on the Narloy-Z, and Copper or Nickel (0.0002"-0.0004") on the stainless. Then braze the two together. However because of the size of the panels, we are looking into using Electroless Gold, Nickel and Copper. Can anyone tell us the disadvantages of using Electroless in a brazing application. Also what types of electroless solutions would work best with this application.

Garry Pickett
aerospace - Los Angeles, California


(1996)

Garry,

Have you considered brush plating as an option? Your panels sound like they could be fairly easily and cost effectively done.

Derek Vanek
Independence, Ohio


(1996)

Garry,
If you use electroless Ni,you need to look at the %P of the deposit and also what type of brazing temp. you are using.Look at a phase diagram of Ni/P to see what temp liquidus temp is.Brush plating might be an option if plating needs to be done on edges,but if both panels need to be brush plated completely,it would complicate the process somewhat,although not impossible.

Tom Sivula
plating shop - Harbor City, California


(1996)

Garry, EN, especially a high Phos one, works very well. Considering the cost of gold, I would doubt the number of places that would have a tank that would take a 3' x 8' panel. If you have long skinny tank to hold down volume (cost) it is going to require very good solution pumping to maintain uniform temp and etc.
Sulfamate nickel brazes very well also
A real question probably is what quantity per week or is cost a small factor to reliability.

James Watts
- Navarre, Florida


(1996)

Additional information.
1. The % of phosphorus is 9
2. The temp. for the brazing operation is 1800 F
3. Nickel Boron or Nickel Phosphorus which one?
4. We plan to make the tanks for plating, and plate only one side completely.
5. Any information on the Electroless Gold that would pertain to operation?

Garry Pickett
aerospace - Los Angeles, California


(1996)

Garry,
Brazing at that high a temp is probably out of the realm of most platers.Two of the better known authorities on electroless plating are Glen Mallory and Juan Hajdu. Both are semi retired but were still active the last I knew. I would try to talk to both of them if at all possible. If anyone can answer your question it is them or they will tell you who to go to.

James Watts
- Navarre, Florida

Ed. note: Sadly we report that Glen Mallory, "the godfather of electroless nickel", is deceased. Mallory & Hajdu's "Electroless Plating" is a classic.


(1997)

Garry;
One problem missed so far in this discussion is that Brazers HATE to put metals into their furnaces with any Phosphorous content as it gasses out as a very corrosive gaseous phosphorous and damages the ovens. E'less Nickel Boron is usually the only alternative for use in brazing ovens. Need additional help/advise? Contact Dr. Lovoi at International Technical Associates (InTA) in Santa Clara, CA. They can braze anything to anything, usually with proprietary, patented braze alloys.
Regards,
Dave

Dave Kinghorn
Dave Kinghorn
Chemical Engineer
SUNNYvale, California




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