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EASY MILL-SCALE & DROSS REMOVAL

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steelfx
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EASY MILL-SCALE & DROSS REMOVAL

Post by steelfx » Thu Nov 21, 2013 4:28 pm

Hi Everyone!
I'd like to post an excerpt from my eBook, 'STEEL PATINAS & FINISHES' which can be found here http://plasmaspider.com/shop/steelfx.html
And, a Brand New alternative to Muriatic Acid for Mill-Scale Removal: GRIME GIT'R?
Thanks!
Bill :D
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MILL-SCALE REMOVAL_hot-rolled-steel_steelfxpatinas.com.jpg
mill-scale-removal_steelfxpatinas_grime_gitter(tm).jpg

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by adbuch » Sun Dec 12, 2021 10:58 pm

Bill - thanks for sharing! This is great information to have available for future reference.
David

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Danj4164 » Wed Sep 14, 2022 9:54 am

Bill,
Will this work on galvanized material to help remove the dross, I paint the signs I make with it anyway so no concern about any damage to the galvanized coating. I have a bunch of free material that I am using for things right now, mainly just want to make sure I don't create a toxic brew LOL.

Thanks,
Dan

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by sonbakler » Wed Sep 14, 2022 10:07 am

I notice Bill has not been very active, I have heard he has some health related issues unfortunately. I expect that you could use this technique on galvanized steel with normal safety precautions when working with this acid.

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Plasma-art » Wed Sep 14, 2022 11:52 am

It also removes the zinc off of it and sometimes reacts pretty violently to zinc so be aware.
I have used it for removing the galvanizing off of chains in a 50/50 mix.

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Danj4164 » Thu Sep 15, 2022 8:38 am

Thanks guys for the responses, I will give it a try and report back with the results.

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Joe Jones » Wed Sep 21, 2022 9:58 pm

I went a different route for mill scale removal.

On the recommendation of a trusted friend, I bought two of these industrial diamond cup brushes and a powerful variable speed grinder to achieve the low (1,000 - 2,800) RPMs required for these brushes to work as designed.

Joe

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Danj4164 » Thu Sep 22, 2022 8:58 am

Morning guys,
Just wanted to share the results from using the 50/50 muriatic acid and water mix on galvanized steel. It did bubble and fizz when I first put the steel in the mixture but after leaving it in for 24hrs the steel was clean and the dross mostly blew off when drying the pieces with compressed air.
There was some dross remaining by easily scraped off with a putty knife.

Thanks,
Dan

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by sonbakler » Thu Sep 22, 2022 9:35 am

Thanks for reporting back on the galvanized Dan, good to know. This stuff is dangerous no matter what but if you do it safely it is hands down the best method of cleaning and dross removal if you can wait overnight :Like :Like

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Retro » Mon Nov 14, 2022 2:07 pm

Im curious about the percentage of the muriatic acid. Here in germany i can buy a 31 % acid. Like this:https://www.ebay.de/itm/325241957978?ha ... BMhrW9qI5h

Does it make sense to still use a 50/50 mix?

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by cuttinparts » Tue Nov 15, 2022 9:02 am

I am not sure to be honest. I would suggest trying a small amount of 50/50 mix in a small plastic sandwich container or something, leave a small part in overnight and if the dross and scale is not gone in the morning try 75/25 and find the balance that works well for the acid your using.

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by finyuk2005 » Sat Nov 19, 2022 2:16 pm

whats the best to neutralize the acid before painting? or do you just wash off with water?
Im guessing it flash rusts pretty quick after?

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by Joe Jones » Sat Nov 19, 2022 7:11 pm

Rinse it with water. Dry it QUICKLY. (Heat gun, propane torch, Acetylene Torch, etc.) Prime it IMMEDIATELY.

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by adbuch » Sat Nov 19, 2022 8:09 pm

finyuk2005 wrote:
Sat Nov 19, 2022 2:16 pm
whats the best to neutralize the acid before painting? or do you just wash off with water?
Im guessing it flash rusts pretty quick after?
Some us a baking soda/water mix to neutralize the acid. Then just rinse off with water.
David

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Re: EASY MILL-SCALE & DROSS REMOVAL

Post by acourtjester » Sun Nov 20, 2022 8:50 am

I have had great results with the pool muriatic acid at 50% with water and overnight soak. Then scrub with Bristle brush in water and washing soda, then clear water and blow dry.
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