Sand blasting media

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PPD
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Sand blasting media

Post by PPD » Tue Jul 14, 2020 5:55 pm

Best media for removing mill scale off of metal for powder coating, I'm using coal slag now and I'm having to watch how
much I concentrate on a certain area for warping, Plus it's taking forever. Is there a better media for quicker results?

Thanks

sonbakler
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Re: Sand blasting media

Post by sonbakler » Thu Jul 16, 2020 12:39 pm

I use the black slag media also, I find it s to most aggressive media that readily available around here but that mill scale is tough sh@* I have not found anything that will easily remove mill scale other than a muriatic acid bath. I have given up on grinding or blasting and use the acid bath. Buying cold roll steel for certain jobs is also an option I use.

PPD
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Re: Sand blasting media

Post by PPD » Mon Jul 20, 2020 9:36 am

Thats a good idea, How long do you let it soak in the acid for?

sonbakler
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Re: Sand blasting media

Post by sonbakler » Mon Jul 20, 2020 10:59 am

I leave it in overnight, check in the morning and if it needs a little more time I will leave it longer but that usually does it. Honestly I put off this technique for a long time but now that I have tried it I will never do anything else. It works so good and even smooths out sharp edges, its amazing really and so simple. After the bath you would swear some of the parts look laser cut.

PPD
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Re: Sand blasting media

Post by PPD » Mon Jul 20, 2020 5:18 pm

Awesome, thanks for the info!!

Is the acid a one time use? if not how do you know when to change it?

4Dscreenart
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Re: Sand blasting media

Post by 4Dscreenart » Mon Jul 20, 2020 11:12 pm

I use the acid for anything smaller than 36x36. The acid in my tub is a few months old. usually I pull it out and rinse of with H2O then scrub with a scrub brush and dawn to clean it off. My solution is about 50/50 ith water. does a good job removing dross as well or if I don't let it soak long enough makes removing the dross much nicer.

sonbakler
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Re: Sand blasting media

Post by sonbakler » Tue Jul 21, 2020 10:29 am

PPD wrote:
Mon Jul 20, 2020 5:18 pm
Awesome, thanks for the info!!

Is the acid a one time use? if not how do you know when to change it?
Just like 4Dscreenart my acid is many months old. I notice it loses some potency with time and parts need to soak a little longer but it lasts a very long time. I keep my soak tub outside except for in the winter but always have it covered with a lid to prevent fumes from escaping.

PPD
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Re: Sand blasting media

Post by PPD » Tue Aug 11, 2020 10:58 am

What kind of container are you using? I can't find anything big enough

sonbakler
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Re: Sand blasting media

Post by sonbakler » Tue Aug 11, 2020 11:41 am

I just found a large shallow Rubbermaid storage tote. How big of parts are you looking to do?

PPD
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Re: Sand blasting media

Post by PPD » Tue Aug 11, 2020 12:18 pm

Hoping to find at least a 36" x 36"

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acourtjester
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Re: Sand blasting media

Post by acourtjester » Tue Aug 11, 2020 2:21 pm

there is a short tub like thing that is used to containment for bad things. there are 2 problems with a tub like these volume of solution and getting it back into storage containers.
https://www.grainger.com/category/safet ... ment-trays
https://www.plastic-mart.com/product/86 ... -op0150-rt
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robertspark
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Re: Sand blasting media

Post by robertspark » Tue Aug 11, 2020 2:55 pm

do you not get these sorts of plastic pallet containers in the us you can cut down to size as they sometimes have a drain tap on them at low level

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acourtjester
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Re: Sand blasting media

Post by acourtjester » Tue Aug 11, 2020 4:50 pm

I Think Robert is talking about these, there was a guy getting them from places the wanted the contents not the container. He would clean them and sell them to who ever wanted one, I think it was about $80. Another thing that is handy for the acid bath is cutting short rings from a PVC pipe (1.5" to 2") and use them to separate the steel parts and keep them off the bottom. If you have a part on top of another they will have a dark shadow where the were in contact.
https://www.greif.com/products-and-serv ... tic-pallet
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robertspark
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Re: Sand blasting media

Post by robertspark » Tue Aug 11, 2020 5:12 pm

Tom, those are the ones, sometimes like you say someone will want the contents and they can be acid resistant (should you feel the need for a breaking bad moment of doing in the competition or being a John Haigh ....)

not sure what they are like strength wise when you cut the top off.... but if you just want a foot or two deep they should be fine. cut with a jigsaw / circular saw?
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PPD
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Re: Sand blasting media

Post by PPD » Thu Aug 13, 2020 7:02 am

Found the perfect tray on the plasti mart website, $77 dollars, and only $215 for shipping. No thanks haha

cuttinparts
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Re: Sand blasting media

Post by cuttinparts » Thu Aug 13, 2020 10:29 am

PPD wrote:
Thu Aug 13, 2020 7:02 am
Found the perfect tray on the plasti mart website, $77 dollars, and only $215 for shipping. No thanks haha
Find a local farm supply store, walk in and tell them what your looking for and I am confident they will have something suitable for you.

PPD
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Re: Sand blasting media

Post by PPD » Tue Aug 25, 2020 5:51 pm

Found a 250 gallon container, the one with the cage around it. cut the side off and its like 37"x43" so I'm very happy with that.
I'm gonna put it outside and put a board on top of it to keep everything out I can. Have any images of how your setup it?
Thought about making a wood box with a hinged top to make it as secure and safe as possible.

sonbakler
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Re: Sand blasting media

Post by sonbakler » Wed Aug 26, 2020 10:30 am

Don't have any pics of my setup but its nothing more than a plastic storage tote with the lid on it. Throw my parts in and pull em out with some gloves on. Safe and secure is super important but I live in the country with no children around anymore so I don't have to be too worried about anyone getting into it. Sounds like you have a good size setup, your gonna love it!

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