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Old 01-29-2018, 02:24 PM   #1
71CHEVYSHORTBED402
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Removing zinc for another finish?

Replacement GR. 8 bolts are generally yellow zinc, so if you want them black then the zinc needs to come off. I'm wondering what you guys recommend to accomplish this, though I may have been successful already........

Image below explains why, but at this point my test is inconclusive. Inconclusive because I used Caldwell black oxide and sealant just to see if successful, but once dry it just wipes right off. This might be because the room temperature of the chemicals was too cold. I'll probably try again in the right temperature using two bolts, one sanded after vinegar.
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Old 01-29-2018, 02:37 PM   #2
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Re: Removing zinc for another finish?

Should be done at room temp at least... check with your local gunsmith , see what he does ,,,
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Old 01-29-2018, 04:26 PM   #3
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Re: Removing zinc for another finish?

I often remove zinc for welding purposes. I use muriatic acid. The concentration depends on how much of a hurry I'm in. Vinegar is a safer but slower option.
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Old 01-29-2018, 04:41 PM   #4
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Re: Removing zinc for another finish?

you neutralize ?
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Old 01-29-2018, 05:27 PM   #5
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Re: Removing zinc for another finish?

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Originally Posted by harpo231 View Post
you neutralize ?
i.e., baking soda? I do.
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Old 01-29-2018, 06:12 PM   #6
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Re: Removing zinc for another finish?

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Old 01-29-2018, 06:25 PM   #7
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Re: Removing zinc for another finish?

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you neutralize ?
I generally don't. I use clear water to gradually cut the concentration until it's safe to pour it out, and then a clear water rinse.
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Old 01-29-2018, 06:30 PM   #8
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Re: Removing zinc for another finish?

That'll work as long as ya give it a good soaking
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Old 01-29-2018, 10:34 PM   #9
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Re: Removing zinc for another finish?

Some of my grade 8 replacement hardware was yellow, I bead blasted then parkerized. You have to do a very thorough job of blasting. On some bolts I didn't find this out until after the black phosphate. I use a home brew, exact temp isn't critical but it needs to be hot, I shoot for 180.

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1 - bead blasted
2 - black phosphate finish & oiled
3 - home brew set-up - Left can is water, right can is solution. Not shown is can for oil, it's on a different warmer. Once I get rolling I'm doing three batches at one time. It's still a whole lot of work.
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Old 01-30-2018, 09:19 AM   #10
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Re: Removing zinc for another finish?

A friend of mine swears by citric acid. Buys it as a concentrated powder from one of the web sites. Safe to use, biodegradable, cheap, pour it down the sink when done...
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Old 01-30-2018, 03:44 PM   #11
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Re: Removing zinc for another finish?

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Originally Posted by randy.powell View Post
A friend of mine swears by citric acid. Buys it as a concentrated powder from one of the web sites. Safe to use, biodegradable, cheap, pour it down the sink when done...
Not a bad choice, either. Pretty much any acid will work to remove zinc; it's just a question of how quickly.
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Old 01-31-2018, 02:00 PM   #12
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Re: Removing zinc for another finish?

My question is while the gold color is gone, what if anything was left behind? As mentioned, when I'm up for it I'll do two more, one sanded. My thought is, if simple cold black oxide sticks to it then other finishes will too.

There's a good chance the bolts will be black zinc plated anyway. Fair assumption it will stick.
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Old 04-23-2018, 01:09 PM   #13
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Re: Removing zinc for another finish?

About 70% vinegar and 30% water overnight on new gold grade 8. I scrubbed one with red scotch bright, and left the other as is, which was discolored, so I had some doubt it would come out nice. Used Caldwell blackening (cold oxide) and sealant on both. The results are about equal and the black sticks, so no doubt black zinc will stick too.
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