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Blackening cast iron


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  #1  
Old 02-22-2007, 01:17:49 PM
John Burns John Burns is offline
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Default Blackening cast iron

I am refinishine some cast iron REID oiler ( blackening cast iron) and was wondering how many techniques there are to do this besides painting? I am currently using a product called brass black, it works ok but I am always looking for new ideas.
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John Burns
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Old 02-22-2007, 01:37:24 PM
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Mike Monnier Mike Monnier is offline
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Default Re: blackening cast iron

I used Stove Polish on a cast iron muffler for my New Way. It's kind of messy, but seemed to work okay. I think it would have been better if I had heated up the muffler afterward as it seems to be wearing off after a couple of years of shows.
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Old 02-22-2007, 05:37:20 PM
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Bill Geyer Bill Geyer is offline
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Default Re: blackening cast iron

I keep my vintage spark plugs looking good with cold gun blue, paste, liquid, it all works about the same. It will also blacken (blue) cast iron, or brass.
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Old 02-22-2007, 09:02:10 PM
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Cool Re: blackening cast iron

John

you seen some of the engines I have restored
I blacken my cast iron parts with a process called parkerizing this is a 3 step process ( can be bought in a kit form and is reusable) you can control the color you want. It's very weather durable.
just something else to think about
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Old 02-24-2007, 08:38:20 PM
John Burns John Burns is offline
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Default Re: blackening cast iron

THANK! for the info, very informative.

John Burns
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Old 02-24-2007, 09:43:32 PM
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Default Re: blackening cast iron

In response to the question of how many ways there are to blacken Cast, beyond painting, one hell of a lot more than I know.

Often it comes down to what was in the pot when the cast was melted to determine the best process.

Parkerising is a rust process, boiling the cast in a solution of phosphoric acid and magnesium. The final color, as with any phosphoric process will depend on the content of the cast.

Oil & baking would deliver a color that was more dependant on the oil used. Oil would be a less permanent process.

The cast could also be allowed to rust, then electrolyticly derusted leaving the black crud to dry. That becomes a virtually permanent coating.

Cold bluing:
Dissolve the following in 5 ounces of water:
2 ounces of ferric chloride
2 ounces of antimony chloride (poisonous!)
1 ounce of gallic acid.
Apply uniformly with glass wool and expose to the air for 24 hours. Wash in hot water and air dry. Lightly coat with oil.

Lampblack & oil is another fairly easy way to go.
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Old 02-25-2007, 01:15:18 PM
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Default Re: blackening cast iron

I have used carbon black mixed in linseed oil. Brush it on and wipe it off.
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