silver soldering inconel 718

I am try to put a coat of silver on some inconel 718 so I can silver solder it to some copper. I trying to use stay-brite 8 silver-bearing solder and stay-clean soldering flux. However, the silver just rolls off the inconel. Can some give me some advice what to use instead.

I am try to put a coat of silver on some inconel 718 so I can silver solder it to some copper. I trying to use stay-brite 8 silver-bearing solder and stay-clean soldering flux. However, the silver just rolls off the inconel. Can some give me some advice what to use instead.

Do you eventually want to use silver solder or silver bearing solder? There is a big difference. I don't know if Stay-Brite #8 will stick to inconel. But you will probably need to sand the surface before the solder will stick. A very thin oxide coating can be hard to remove with low temperature fluxes. That's why sanding will probably be needed. And you will still need to use flux. But if you want to silver solder the inconel to copper the temperature to melt silver solder will boil off the silver bearing #8 solder. ERS

See

You will need to move up to a higher temp flux and solder. A true silver solder, and a flux like Sta-silv. The metal should almost be glowing red before the stuff will flow.
Mind you that there are aerospace solders for use on high nickle alloys that are basically Nickle solders.
Wall-Colmonoy makes a bunch of them.

Commandcorps wrote: