Anti-galling plating help required please!

A. I would have suggested silver or tin until you said sulfide. I would investigate using between 0.0005 and 0.001 of electroless nickel on the male threads. It is harder than copper but will plate relatively evenly, so should work.
What is wrong with using teflon tape?

First of three simultaneous responses --

A. Sounds like an excellent application for electroless nickel/teflon.

Second of three simultaneous responses --

A. In the past I have used silver plated onto the stainless steel to overcome galling problems, but I see this application will be exposed to H2S, so it may not be suitable. I used a cyanide silver strike system and it seemed to work OK. However, if silver is no use, it may be worth trying a gold coating - bit expensive but it probably will work.

Third of three simultaneous responses --

! Hi James,

Thanks for the information. I'm going to give the Nickel a shot and see what happens.

Although teflon tape would probably be very successful, I am a little bit caution of using it as we have o'rings at every threaded interface. A piece of tape could work it's way across the sealing face can compromise the joint.

Thanks again,
Leo Hinton

A. We also provide downhole tools subjected to the same H2S environment the only variations are the materials we use are 718 Incos and the copper plate is more of a flash with .0003-.0005". Seems to work well as an anti-galling agent, at least in our application.