How Do I Remouve This Black Coating On Metal Rod?
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Joined: August 11, 2014
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Location: Ontario, Canada

How Do I Remouve This Black Coating On Metal Rod?
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Posted on Wed Aug 20, 2014 12:15 am
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I picked up some more metal rods to coil some more wire, however they have a black coating on them. The black will transfer to hand easily when touched and I have managed to rub a bunch off, but I was wondering if there is a good method of removing it completely.Is this black oxidization?

Joined: May 18, 2014
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Posted on Wed Aug 20, 2014 1:29 am
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Hard to tell what it might be from that description.

I would suggest some warm water and a simple rag.
If that doesn't do the job, add a small amount of mild soap.
If that doesn't do the job, you might upgrade to hot water.

Without knowing more about what the coating might be, though, I wouldn't recommend anything stronger.

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Posted on Wed Aug 20, 2014 1:50 am
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It could be mill scale, solvent or an acid may work.
I usually just place the mandrel in a drill and rub it down with steel wool or a green scubbie

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Posted on Wed Aug 20, 2014 11:48 am
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Yah, sounds like mill scale.
My method to deal with, is to remove all what is loose with emery paper, followed by a ruboff with an oily, then a dry rag. What isn't removable, may stay, as it's a fairly effective protection against rust - and dirt that isn't removable, isn't dirt...
-ZiLi-


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Posted on Wed Aug 20, 2014 11:36 pm
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ZiLi wrote:
?..dirt that isn't removable, isn't dirt...
-ZiLi-


That is absolutely my quote-of-the-day.

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Posted on Fri Aug 22, 2014 11:30 am
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What you probably have is steel Tie Wire, it's around 16g and comes in 3.5lbs rolls. It's looks like a black wire until you realize the black wipes off as you handle it. As mentioned above it's mill scale which is caused by annealing the wire at the factory.

The easiest way I've found to remove it is to wipe the wire down length wise with a rag soaked in vinegar followed by a wipe with an oily rag once cleaned. It may take more than one pass of the vinegar to get it really clean but you'll notice a pretty marked difference even after the first pass. Tumbling the cut rings or finished piece should clean it up fully.

You may want to wear some gloves as the vinegar/mill scale mix is quite dirty and really dries out skin.


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