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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

5 months 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

6 months 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

5 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

5 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

6 years ago

for they small parts use a black waterproof marker

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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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AranoThe Machinist - Jason

Answer 8 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-designlemonie

Answer 8 years ago

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

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lemonieRe-design

Answer 8 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

8 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