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Old 11-13-2017, 11:34 PM   #1 (permalink)
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Corrosion on brass removal?

Scored a deal on a Brass Eagle Long Barrel Nightmare. Pretty sure it has spent the last quarter century in the case, quietly corroding until I opened it yesterday. It is kind of furry around the gravity feed adapter, on the bolt, the back end of the bolt, and where the raincover was fitted. How do I remove this without damaging the goods?
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Old 11-14-2017, 12:13 AM   #2 (permalink)
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That's a great find!
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Old 11-14-2017, 08:59 AM   #3 (permalink)
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Try this


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Old 11-14-2017, 10:05 AM   #4 (permalink)
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The liquid bar keepees doesnt wprk as well as the powder. Just from exp. I have no idea how well itl work on the corrosion.
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Old 11-14-2017, 11:13 AM   #5 (permalink)
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I've used the powder with some success. Liquid is just a little less harsh. I don't know but another thing to look into is brasso. Works well with oxidation on copper pipes. Maybe you will have some luck using it. Years ago when I was a probationary Firefighter we all got punished and had to brasso the copper pipes under the sink in the bathroom. There was years of crap built up on them. They now look like new lol
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Old 11-14-2017, 11:33 AM   #6 (permalink)
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Just as a try, have you attempted to spray it with WD-40 or the like to see what happens?

I know it isn't a "tarnish" remover...but IME polishes and the like work better on bare brass. I don't know what process is used to "paint" (?) the brass black like that but my concern would be taking it off accidentally.
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Old 11-14-2017, 11:53 AM   #7 (permalink)
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Brasso or jewelers rouge and a buffing wheel.
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Old 11-14-2017, 12:25 PM   #8 (permalink)
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It's a tough situation, anything that "polishes" will be abrasive, and that brass nightmare is chemically blackened. It'll come off just as easy as the corrosion...

I'll dig around in my parts bin, see if I have any brass parts with comparable corrosion to test some things on. I'm wondering if something simple as a soak in vinegar would work (without removing black), or if Evapo-rust would touch it (formulated for iron oxide, but worth dunking a test piece...)
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Old 11-14-2017, 01:20 PM   #9 (permalink)
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Oh your trying to keep the blacked tarnished finish. I wouldent buff it then brasso will remove that.

Maybe somthing that will tarnish it after cleaning it up?
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Old 11-16-2017, 09:46 PM   #10 (permalink)
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Ok, so here we go! Did a basic disassembly, pics of which I will post later under "Archeology 101", and decided to try out Vinegar as a solvent. Pretty fuzzy piece, may even be copper, but giving it a go. The first ten minutes removed most of the corrosion but there was still a distinct layer, so lets see what an overnight bath will do. More tomorrow!
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