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how to do black oxide at home? Answered

 I have some machined steel parts I would like to black oxide to prevent rust and to make look nice. I would like to know the chemicals involved to make the immersion bath for room temperature black oxide.

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CardiacK
CardiacK

3 years ago

Best way to get a blacked finish on steel is FeCl3 otherwise know as Ferric Chloride. All you are doing is etching the surface to hold oil on the surface .

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xXleslyXx
xXleslyXx

3 years ago

heat it up to cherry then cover it in oil. any oil will do but linseed is best. Either put some on a rag and wipe it on when its hot or dunk it in oil. it has to be cherry not any hotter or it will harden and not work

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Wisaam
Wisaam

8 years ago

I wouldn't recommend using black oxide because I don't think it would help that much for a long time. Why don't you just paint it with black colour or use black water proof marker.

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ewilhelm
ewilhelm

8 years ago

The above comment was copy of the text here:
http://www.finishing.com/faqs/blackoxide.html
and has been removed because it did not link back or provide attribution.

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Alcyon
Alcyon

9 years ago

for they small parts use a black waterproof marker

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The Machinist - Jason
The Machinist - Jason

11 years ago

Just remember black oxide will only prevent rust for a short while. If you want to keep your projects from permanetly rusting you need to paint or powder coat it.

Jason

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Arano
Arano

Answer 11 years ago

black oxide turns to rust when exposed to water but it is very porous and adhesive... in history it was used to protect the steel along with oil

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Re-design
Re-design

Answer 11 years ago

After reading that I think I'd just blue it like a gun barrel.

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lemonie
lemonie

Answer 11 years ago

That was my first thought for an answer. But then I thought "maybe this / these is/are big, and gun-blue might be an expensive option, so I'll do a quick one (search) for the question they asked."

L

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steveastrouk
steveastrouk

11 years ago

If you're in the UK, most engineer's merchants can supply KoldBlak, which is the proprietary process.

I really don't advise making your own.

Steve