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  #11  
Old 10-10-2014, 06:56 PM
longyard longyard is offline
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Thanks Kent. What I'm trying to learn is the process that some engine builders, like VW on Beetle jugs, or even some motorcycle engine makers, used to turn their air-cooled cylinders black. Thought there was a specific process that made them black and that there was a purpose to it, probably rust prevention. Perhaps it is manganese-phosphate as has been suggested?
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  #12  
Old 10-10-2014, 08:21 PM
crystallographic crystallographic is online now
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Quote:
Originally Posted by longyard View Post
Thanks Kent. What I'm trying to learn is the process that some engine builders, like VW on Beetle jugs, or even some motorcycle engine makers, used to turn their air-cooled cylinders black. Thought there was a specific process that made them black and that there was a purpose to it, probably rust prevention. Perhaps it is manganese-phosphate as has been suggested?
That is a very popular process in industry. I'd guess it is a likely suspect.
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  #13  
Old 10-10-2014, 09:52 PM
scranm scranm is offline
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http://www.kecocoatings.com/racing/racing
The indy car guys use their coatings all the time for things like a-arms.
Kephos product.
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Last edited by scranm; 10-10-2014 at 10:01 PM.
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  #14  
Old 10-11-2014, 06:56 AM
longyard longyard is offline
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Thanks Mark. Those look like great processes, but I don't think they would have been available some decades ago.

I read through some of the pages and I wish I could use some of their products in my home shop. Some of their powdercoating technology would be very useful to me if it could be done on a small scale.
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  #15  
Old 10-11-2014, 07:17 AM
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Kerry Pinkerton Kerry Pinkerton is offline
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Meloniting might be what you are looking for. A gunsmight buddy uses it on barrels, frames, etc. According to the link below:

Quote:
Salt-bath nitrocarburizing by Melonite process has been applied in a wide range of industries throughout the world for many decades. It is used to improve the wear resistance, the fatigue strength, and corrosion resistance of components made from steel, cast iron, and sintered iron materials. The Melonite process is used as an alternative to other surface engineering processes such as case hardening.
http://bulletin.accurateshooter.com/...s-and-actions/

Gun barrels get very hot.
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  #16  
Old 10-11-2014, 07:35 AM
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Very interesting stuff. I have been curious about these processes, for example what Joe Andrews uses on his adjusters and cradles.
Now I have to find out if any of the stuff you have come up with is available in the Netherlands.
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  #17  
Old 10-11-2014, 08:24 AM
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I've used the Precision Brand 'Tool Black' a 2 step process with mixed results. Sometimes it works pretty good and other times it won't do anything. I recently did 6 Holley 94 cast iron throttle plates, I was pleased with one of them, a couple were marginal and the others will need to be media blasted back to raw metal as they flash rusted immediatly.
I would not reccommend it.
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  #18  
Old 10-11-2014, 01:39 PM
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Frank.de.Kleuver Frank.de.Kleuver is offline
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Joris,

Did you have a look at Jeroen his site fir blackening stuff? Www.frost-auto.nl

I've backened the bracket of my upper. Came out nice.

Greetings,

Frank
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  #19  
Old 10-11-2014, 10:13 PM
longyard longyard is offline
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Thanks Kerry, and all. I've used Eastwood's blackening formula with poor results despite scrupulously following the directions.
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  #20  
Old 10-12-2014, 01:34 PM
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i am an antique restorer by trade so metal blacking something i do regularily.
traditionally done by dipping steel in hot caustic soda.that leaves a black oxide layer which is absorbent. the piece is then dipped in oil and wiped clean and can provide an effective rust proof surface for decades-but must be dipped in oil which stops the water ingress.
modern techniques use dipping in cold manganese phosphate etc with a similar effects but it still needs dipping in oil as again it leaves a porous surface[
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