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Posted: 7/15/2024 2:12:36 PM EDT
| Anyone know of a vendor that provides Mil-13924 black oxide finishing service for small/low quantity items? I see several for large/high quantity items and they charge the same $150 lot charge even for a few small pieces. Thanks. |
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Blast and Parker them yourself to save money, kits are available. Mil-13924 appears to be a very minimalist coating anyway. MIL-DTL-13924E, DETAIL SPECIFICATION: COATING, OXIDE, BLACK, FOR FERROUS METALS (12-SEP-2018)., This specification covers black oxide coatings applied to ferrous metals (carbon, low alloy, and corrosion resistant steels, and wrought iron). Black oxide coatings, with or without a supplementary preservative treatment (see 3.11), may be used where a black surface is required. Only very limited corrosion protection, under mildly corrosive conditions, is obtained as a result of black oxide coating (see 6.1). Black coatings are included in this specification with limitations as noted in 1.2. Unless contraindicated by contract, chrome-free finishes should be used in place of finishes containing hexavalent chromium, provided all performance criteria herein has been met and documented as OQE. |
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Originally Posted By CJofFL: For parkerizing small/low quantity parts I've used Retro Gun Works, but I have an application where black oxide is specifically needed. Anyone know of a place? Assuming you mean Retro Arms Works? If so, JT does amazing park work. I can't help on the black oxide, but subbed for info. |
Can't never could 'til try came along.
"All welchers should be removed from the EE".-Aimless
R.I.P. to the EE
"All welchers should be removed from the EE".-Aimless
R.I.P. to the EE
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Depending on the parts, it's not hard to do yourself. Bring a tub of distilled water to a boil, start adding and mixing salt, like two or three cups per gallon. Place your cleaned and degreased parts in until they surface rust. Pull the parts out and use some steel wool, 000 or 0000, to card off the rust so it's a surface patina. Repeat the boiling and carding until the rust is even and deep as you want. Bring a tub of straight distilled water to a boil, and place the parts in, this will cover the rust from red oxide to black oxide. Remove, dry, and oil. |
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Black oxide is extremely easy to do yourself, like stupidly easy. Get an Amazon hotplate, a small stainless food serving steam table bin, add distilled water, lye and stump remover (potassium nitride), heat to 280 and drop the degreased parts in for about 20 minutes. Look online for the exact mix ratio. You don't even need to card or reboil this way. Total cost was about $50 to DIY. Just make sure you wear gloves and a respirator. You can even save the mix in a jar and reuse it. |
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