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Cleaning with muratic acid

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Jeff L

10-21-2002 15:29:29




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Has anyone had experience using muratic acid to clean rusted parts? I have a D that we are restoring and one of the neighborhood oldtimers says that cleaning dirty/rusted parts with Muratic is the only way to do it.
Does anyone have any experience with this process either good or bad? Will it eat into the new paint over time? Thanks

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Bob

10-22-2002 17:08:03




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 Re: Cleaning with muratic acid in reply to Jeff L, 10-21-2002 15:29:29  
Sorry, the link did not come up in the previous post.



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Bob

10-22-2002 17:06:21




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 Re: Cleaning with muratic acid in reply to Jeff L, 10-21-2002 15:29:29  
A far better method is ELECTROLYSIS. If not familiar with the term, go to Smokstak.com and search the archives for ELECTROLYSIS. There is a wealth of information there, and a good feature is the process stops when you're down to good metal, and there is little, if any chance of damage to the part your cleaning.



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Henry J

10-22-2002 09:29:08




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 Re: Cleaning with muratic acid in reply to Jeff L, 10-21-2002 15:29:29  
Jeff

I have used it with about the same success as Dennis.



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Dennis Kuehl

10-21-2002 20:50:28




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 Re: Cleaning with muratic acid in reply to Jeff L, 10-21-2002 15:29:29  
I use muratic acid all the time just throw your rusty or old panted parts in a bucket and keep checking parts until rust is gone and part looks like new. make sure parts are compleatly submurged in acid,it will start to boil or bubble use ruber gloves and check parts after a few hours ,dont breath in fumes, after you take parts out of bucket wash off with water till clean,use hot water so part gets real hot and the water will evaporate off part fast.after dry put in dry place or paint or prime,your new paint will be fine with no problems from acid,paint will stick better after acid because acid etches the iorn.works real good.

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Clooney

10-21-2002 15:59:44




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 Re: Cleaning with muratic acid in reply to Jeff L, 10-21-2002 15:29:29  
Jeff, I have tried it & was not pleased with the results. It does attack rust but the down side is it also attacks clean metal & pitting & metal degradation does result.
~It won't eat into new paint placed over it if it is neutralized with water & something like T.S.P.
~Using muratic acid opens the metal up to extremely fast re-rusting also.
~The best way is to use the electrolysis bath that F-I-T has posted about in the past, or sand blasting, then in either case treat the metal with phosphoric acid to kill the remaining rust in the pores so re-rusting is all but eliminated. One advantage of phosphoric acid is that paint & primer sticks extremely well to a surface prepped with a phosphoric acid etch.
~If you try muratic acid do so on an easy to replace small piece to see if you can live with the metal pitting & quick rusting. CAUTION: that stuff will severely damage your lungs & the use of a fresh air supply is a must, even a canister mask isn't enough protection..... ..

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Jeff L

10-22-2002 19:30:02




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 Re: Re: Cleaning with muratic acid in reply to Clooney, 10-21-2002 15:59:44  
Can I ask what TSP is and where it can be obtained?
Thanks



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mark in mo

10-22-2002 22:42:26




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 Re: Re: Re: Cleaning with muratic acid in reply to Jeff L, 10-22-2002 19:30:02  
T.S.P.
TriSodiumPhosphate is a cleaning agent that is used by most soap manufacturers in small to large quantities. Especially in laundry detergents.
It can be obtained at most paint stores.
Mark



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Ralph

10-21-2002 17:03:36




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 Re: Re: Cleaning with muratic acid in reply to Clooney, 10-21-2002 15:59:44  
I agree with Clooney. Muriatic or hydrochloric acid (actually the hydrogen ion)is effective at dissolving rust, but once the acidity (hydrogen ion) is gone, the chloride ion is equally effective at promoting more rust. Chloride ion in salt is the culprit in rusting out cars here in WI. I am about to give "milkstone remover" (a mixture of phosphoric and sulfuric acid) a whirl. Trick is to use just enough to take the rust, and not enough to etch the metal. I am currently in my wife's good graces after I cleaned some rust spots on bath fixtures with it. Sulfuric acid is the active ingredient in battery acid, i.e. it eats cotton clothing amoung other things.

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