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Muratic Acid and Rust

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ray

10-10-2001 18:28:03




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About eight months ago I used muratic acid to remove some rust on some castings. I thought I had the acid neutralized but apparantly not. The rust is coming through the paint in spots. I plan to sandblast the castings. Will sandblasting eliminate the problem or will the acid still be a problem? Suggestions?
thanks,
ray




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Bill

10-13-2001 06:51:55




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 Re: Muratic Acid and Rust in reply to ray, 10-10-2001 18:28:03  
I had the same problem with the acid treatment.I found out if you wash the parts off with hot water it closes the pores in the metal and seals the acid in so it doesn't all get washed out--so it will keep working. Use Baking Soda and cold water.And sandblasting wont get it all either in cast metal.Tried that too.



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David H

10-11-2001 21:15:04




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 Re: Muratic Acid and Rust in reply to ray, 10-10-2001 18:28:03  
Try Evapo-Rust instead of acids. Acids are dangerous to use, cause hydrogen embrittlement, flash rusting, can damage parts and are hard to dispose of. Evapo-Rust uses a new type of chemistry that just won a TOP 100 award from R&D Magazine and is available commercially. WWW.EVAPO-RUST.Com. Several folks on this site have used it. See what they said about it.



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Franz

10-10-2001 23:15:24




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 Re: Muratic Acid and Rust in reply to ray, 10-10-2001 18:28:03  
You have got to neutralize the acid chemicly.
One of the biggest problems with castings is micro poroscity within the casting wicking acid into little fissures. Over time, the acid will seep out and give you nightmares.
The electrolytic process will remove the rust you've developed, as well as neutralize the acid.
In this case, you could use Baking Soda instead of washing soda, and probably see better results.
The other thing you could do is use a phosphoric acid process, to convert the iron oxide to iron phosphate, the small amount of muriatic you still have in the casting should neutralize out, and you'll wind up with a nice coating on the cast that will serve as a great paint primer.

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