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#3148811 - 10/08/13 06:03 AM need something to dissolve rust flecks on rawsteel
dwcopple Offline


Registered: 10/11/04
Posts: 3748
Loc: Michigan
I have a machined piece of steel "in the white" that has some small rust flecks over it. I tried mineral spirits and 0000 steel wool and it just lightened it a bit. what should I use?
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#3148814 - 10/08/13 06:08 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
Jay1981 Offline


Registered: 10/06/12
Posts: 128
Loc: Michigan
I've used vinegar to soak tools with rust on them. It works well but then they need a light coat of oil or they rust again.
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#3148825 - 10/08/13 06:27 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
Phishin Offline


Registered: 05/01/12
Posts: 2461
Loc: Indiana
Vinegar works well. And yes, oil or prime/paint immediately....acid will activate the metal to quickly rust again.
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#3148895 - 10/08/13 08:05 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
nitehawk55 Offline


Registered: 04/01/10
Posts: 1084
Loc: Ontario , Canada
phosphoric acid
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#3148951 - 10/08/13 09:14 AM Re: need something to dissolve rust flecks on rawsteel [Re: nitehawk55]
SatinSilver Offline


Registered: 01/24/08
Posts: 10342
Loc: OH

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#3148953 - 10/08/13 09:18 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
JHZR2 Offline



Registered: 12/14/02
Posts: 41906
Loc: New Jersey
Naval Jelly?

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#3148961 - 10/08/13 09:26 AM Re: need something to dissolve rust flecks on rawsteel [Re: nitehawk55]
Phishin Offline


Registered: 05/01/12
Posts: 2461
Loc: Indiana
Originally Posted By: nitehawk55
phosphoric acid


Regular Coca Cola.
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#3148962 - 10/08/13 09:27 AM Re: need something to dissolve rust flecks on rawsteel [Re: JHZR2]
dparm Offline


Registered: 04/19/10
Posts: 13521
Loc: Chicago, IL
Originally Posted By: JHZR2
Naval Jelly?



Bingo. You need to neutralize the rust, but you must paint over it immediately or the rust will just come back.
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#3148965 - 10/08/13 09:38 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
benjamming Offline


Registered: 01/03/04
Posts: 5920
Loc: northern Alabama
Naval jelly has phosphoric acid - up to 30% along with a small amount of sulfuric acid (think pickling).

Are you experience flash rust on the part?

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#3149378 - 10/08/13 03:42 PM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
dwcopple Offline


Registered: 10/11/04
Posts: 3748
Loc: Michigan
used CLR and it darkened the metal significantly frown Now what?
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#3149724 - 10/08/13 09:15 PM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
dwcopple Offline


Registered: 10/11/04
Posts: 3748
Loc: Michigan
I wiped of the blackish residue and wiped it down with Ed's Red. I just took it out and dunked it in my used engine oil and am letting it drip dry back into the bucket overnight. Tomorrow I'll brush it off with some kerosene and a parts brush. Then it should be good to go I guess.
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#3150001 - 10/09/13 08:57 AM Re: need something to dissolve rust flecks on rawsteel [Re: dwcopple]
Phishin Offline


Registered: 05/01/12
Posts: 2461
Loc: Indiana
CLR created oxides on the metal. That's why it darkened up.

Why not degrease the part, and immediately slap some primer on it....and then put whatever paint/finish you want on it?

My favorite rust preventor is Phosphoric Acid with Zinc Oxide dissolved in it. I make my own. But POR 15 makes it as well. The acid eats away the rust, and the zinc deposits on the iron (which forms a galvanic-like coating on the steel). This prevents rusts from forming by "sealing" it off, and the zinc is sacrificial to the iron.

Then paint immediately once dry. POR15 has an excellent paint product as well.
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#3150800 - 10/09/13 11:01 PM Re: need something to dissolve rust flecks on rawsteel [Re: Phishin]
wally6934 Offline


Registered: 02/18/12
Posts: 318
Loc: Wi
Originally Posted By: Phishin
My favorite rust preventor is Phosphoric Acid with Zinc Oxide dissolved in it. I make my own. But POR 15 makes it as well. The acid eats away the rust, and the zinc deposits on the iron (which forms a galvanic-like coating on the steel). This prevents rusts from forming by "sealing" it off, and the zinc is sacrificial to the iron.

Then paint immediately once dry. POR15 has an excellent paint product as well.


Can you share your top secret procedure for making the generic Por-15. Also does it have a shelf life.

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#3150894 - 10/10/13 06:06 AM Re: need something to dissolve rust flecks on rawsteel [Re: Phishin]
dwcopple Offline


Registered: 10/11/04
Posts: 3748
Loc: Michigan
Originally Posted By: Phishin

Why not degrease the part, and immediately slap some primer on it....and then put whatever paint/finish you want on it?
because it is a moving part on a rifle
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#3269660 - 02/03/14 09:40 PM Re: need something to dissolve rust flecks on rawsteel [Re: Phishin]
daves66nova Offline


Registered: 04/11/04
Posts: 3655
Loc: los angeles
Originally Posted By: Phishin

My favorite rust preventor is Phosphoric Acid with Zinc Oxide dissolved in it. I make my own.
Can you share your top secret procedure for making the generic Por-15. Also does it have a shelf life.
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