Question of Tenifer finish


January 21, 2003, 10:41 PM
I have a EAA Witness that I picked up used and is a really nice pistol. The Wonder finish (tenifer) does have some discoloration on the slide and frame by the slide release. I understand that Glock pistols also have this application under their primary finish. I would like to eventually refinish the Witness with parkerizing or maybe what the Glocks use. Any suggestions or different ideas?

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January 21, 2003, 10:44 PM
Are you concerned with looks or function/durability?

January 21, 2003, 11:24 PM
Weshoot2 - I would say looks. The wonderfinish seems to be a good durable finish, but those marks really bug me. One thing I'm not interested in is replacing the finish by bluing. I'd like whatever I use to be a good durable finish, even replacing the wonderfinish if possible, and if parkerizing will work, that's Ok, because I can have that done locally.

January 22, 2003, 12:20 AM
Tenifer is a really great & durable finish.

Just have a polymer applied over it. You an even do this yourself.

I think that you can also put phosphate/parkerizing directly over it.

January 22, 2003, 05:35 AM
Go to the "Gunsmithing" area (both here and and ask about 'finishes'.

Parkerizing is NOT durable.

January 22, 2003, 07:02 PM
What is Tennifer?

Tennifer (nitro carburizing) is a pressurized gas heat treatment. During that process, Glock (and others) cause a black oxide process to coat the surface. It's all part of the same process. If you scrape off the black, the nitraded metal remains because that is actually into the metal a little ways. Wonderfinish just leaves the oxide part off. Both pistol surfaces are left very hard and non-reactive (probably because the iron is already bonded to nitrogen, but that's a guess).

So you cannot a) remove the nitrading (it's too far into the metal) or b) plate or treat the metal with anything else. Parkerizing, bluing, black oxide or any other reactive process won't work. It's like the gun is stainless.

You could always paint something on it, but if you're going for looks, that will just wear on all the sharp edges and maybe look as bad as the discoloration.

I would try removing the discoloration using chemicals. Try a test spot on the inside of the frame first. Try Blue and Rust remover, tarnish remover, maybe even bleach or some watered down acid? I like the Wonder look and would try to preserve it.

Nero Steptoe
January 22, 2003, 07:09 PM
"Parkerizing, bluing, black oxide or any other reactive process won't work. It's like the gun is stainless."

Kind of makes you wonder what process is used when a Glock slide is sent back to Glock for refinishing. I'm pretty sure that the new oxide/phosphate? finish is applied over the original tenifered steel slide.

January 22, 2003, 08:16 PM
Not sure. Can they redo a slide that's been stripped and polished, or are they just reintroducing more oxide to the partially oxided surface? Or is it goo?

The information I have is probably from the older matte colored slides. The newer glossy slides I can't speak for; are they the same stuff?

January 25, 2003, 01:25 PM
Carbo-nitriding like Tenifer is a process where carbon and nitrogen are diffused into the steel . It forms carbides and nitrides with iron and other alloying elements. The diffusion layer is relatively thin but very hard and wear resistant.

January 25, 2003, 03:12 PM
I did come across info that said Glock is parkerized after Tenifer.

January 26, 2003, 01:26 PM
Can't help you with looks, but I prefer NP3 (Robar) and hardchrome.

January 26, 2003, 01:54 PM
my understanding is that the tenifer finish on the glock is, as others have said, a treatment extending a few microns into the metal. I have heard that a "black oxide" finish is applied over it for looks. I don't know whether the term black oxide is the actual coating or something that looks like black oxide. I saw a glock that had had its finish removed by bead blasting and it looked kinda cool, a sort of soft-muted silver look. The tenifer treatment supposedly provides a fine corrosion resistent surface itself. I've never heard of anyone parking or blueing one and doubt it could be done. I've only seen polymer type coatings.

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