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Author Topic: Removing rust  (Read 1455 times)

Offline Gary Bakeslee

  • CLC #24341
  • Posts: 69
Removing rust
« on: July 28, 2013, 09:06:04 PM »
Has anyone used muriatic acid for the purpose of killing rust on automotive sheet metal parts?   If so how well does it work?
Gary B
Gary Blakeslee

Offline Jeff Wilk

  • J. Wilk CLC # 25630
  • Posts: 1324
  • The Past + The Future = My Heaven on Earth
  • Name: Jeff Wilk
Re: Removing rust
« Reply #1 on: July 28, 2013, 09:13:41 PM »
Gary, muratic acid or sulfuric acid or battery acid.....all basically the same thing with different dilutions works well if you use it correctly and in the right dilution for your application.  In ANY use though you have to be real careful handling it for obvious reasons.....

I use this in plating small parts in my workshop with a Caswell Plating set-up.  After degreasing parts in a hot degreasing bath, the metal will form a surface rust haze in no time.   A few seconds (15-30) in a muratic acid bath (1:20 mix) takes the rust off like magic.  Then a clean distilled water dip, and then into the zinc plating solution.  15 mins later I have a like new zinc plated part.......without the muratic dip the plating would be blotchy at best. ;D

"Impossible Only Describes The Degree Of Difficulty" 

Southern New Jersey

1959 Cadillac Fleetwood Sixty Special
1975 Eldorado Convertible (#12 made)
1976 Cadillac Mirage (factory authorized Pick-Up)
1933 Phaeton Chevrolet - "Baby Cadillac"
1933 Master Sedan Chevrolet - "Baby Cadillac"

1958 Cadillac Sixty-Special
1958 Cadillac Sixty-Special
1958 Cadillac Sedan
1958 Cadillac Coupe Deville

Offline n2caddies

  • Posts: 380
  • CLC Number: 26143
  • Name: Randy George
Re: Removing rust
« Reply #2 on: July 28, 2013, 11:36:56 PM »
I would stay away from it Muratic acid also called Hydrochloric Acid attacks metal eating it away in the little nooks and crannies it gets trapped in. There are many other products on the market today that will do a safer job attacking the rust and not the metal.
Randy George CLC# 26143
1959 Series 62 Convertible
1960 Series 62 Convertible
1964 Deville Convertible
2015 SRX

Offline Quentin Hall

  • Posts: 1447
Re: Removing rust
« Reply #3 on: July 29, 2013, 03:23:37 AM »
The best rust remover of all is phosphoric acid. It is a metal conditioner. Ideally you should immerse the item in overnight if it is badly rusted. I have a 1000ltr bath that I drop items in. I buy food grade 80% concentrate in a 20 litre for $90. I dilute it about 7 to 1 with water. It doesn't attack the metal , only the rust. That said do not immerse diecast , cast or spring steel in it. (It will damage these metals). It is very good on aluminium and stainless.
   Prior to paint you should water blast and dry immediately with methylated spirits and rub over with a scotchbrite pad.   
53 Eldo #412.
53 Eldo #433
53 series 62 conv
39 Sixty Special Custom
57 Biarritz

Offline Tim Pawl CLC#4383

  • Posts: 142
Re: Removing rust
« Reply #4 on: July 29, 2013, 08:20:17 AM »
I recently tried "EvapoRust" available in gallon container at Harbor Frieght and other places. It is endorsed by Rick Dale from the show "American Restoration"    , supposedly environmentally friendly (Beet juice?)   . Amazing results on bolts nuts and brackets imersed at temperature above 70F.   Says for sheetmetal to soak rags and place on sheetmetal haven't tried that but product is amazing overnight results and reusable.  When I think of all the time I have spent over the years on wire wheels, blasting, and chemicals...this stuff is effortless.  Trick is warmer is faster.  Tim Pawl CLC#4383

Offline Fred Pennington 25635

  • Fred Pennington
  • Posts: 334
Re: Removing rust
« Reply #5 on: July 29, 2013, 11:49:17 AM »
Cheep and easy rust remover is a  50/50 mix of white vinegar and water.
Just soak a few hours or over night for the tough stuff and rinse off.

Fred P.
Fred Pennington, CLC 25635
1940, LaSalle 5019
1940 LaSalle 5019 parts car
1968 Ford Bronco
1973 Mustang Convertible
2012 Shelby GT500

Offline 66 Eldo

  • Posts: 294
  • Name: P. Kats
Re: Removing rust
« Reply #6 on: July 29, 2013, 12:56:06 PM »
What type of acid do carburetor rebuilders use? Whatever it is/was, it is now illegal in CA (of course) and would make an old carburetor look new. I seem to remember it being muratic acid but not sure as that would not align with an earlier post here of damaging metals. 


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