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  1. #1
    Join Date
    Nov 2006
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    402

    Default cleaning corroded aluminum

    guys
    how do you clean corroded aluminum before tig welding ?

    welding 6061 with 4043 filler.

    im thinking on using either a sanding flap disc on a 4 1/2" angle grinder or a scotch brite wheel on an air grinder...

    just curious as to what you guys use..

    is denatured alcohol a good solvent to wipe it down with ?

    thanks
    Syncrowave® 200
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  2. #2
    Join Date
    Feb 2012
    Posts
    561

    Default cleaning corroded aluminum

    I use acetone for a cleaning solvent.
    Kevin

  3. #3
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
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    3,562

    Default

    It depends on what corroded it and how bad.
    Without pics or at least a detailed desciption it would be wrong to give you an answer IMO

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  4. #4
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
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    4,383

    Default

    4 inch wire wheel and rip it.

  5. #5
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,168

    Default

    I have been using muriatic(pool)acid.

    But I have just heard EasyOff oven cleaner and Draino work too. Will be trying them both.
    Nothing welded, Nothing gained

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  6. #6
    Join Date
    Nov 2003
    Posts
    3,149

    Default

    I would use phosphoric acid.... it is the most accepted method of cleaning off corrosion and etching the surface in fields like aircraft refinishing (some industrial cleaners also add hydroflouric acid... but it is highly toxic and dangerous.. so I would avoid them)

    Phosphoric acid is ALSO commonly used as grout cleaner and can be found in home depot type stores in the ceramic tile section......

    phosphoric will remove corrosion without damaging the metal....

    here is a data sheet for one phos acid based cleaner..


    http://www.chemical-supermarket.com/...20Bulletin.pdf

    here is a link to the home depot stuff.. not cheap but a gal will last quite a while...

    http://www.homedepot.com/webapp/wcs/...2863%2d%5f%2dN

    BTW this method will also clean the dark surface oxidation off of aluminum boats.... leaving a clean matte white aluminum surface...
    Last edited by H80N; 05-16-2012 at 02:27 PM. Reason: spelling..
    .

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    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

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  7. #7
    Join Date
    Mar 2011
    Location
    La
    Posts
    248

    Default

    I agree with H80N, I use Alumabright Cleaner ( an acid wash). Works great, removes all corrosion. Here is the link. http://www.envirotechcoating.com/Aluma-Brite/


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  8. #8
    Join Date
    Nov 2003
    Posts
    3,149

    Default

    Quote Originally Posted by ja baudin View Post
    I agree with H80N, I use Alumabright Cleaner ( an acid wash). Works great, removes all corrosion. Here is the link. http://www.envirotechcoating.com/Aluma-Brite/
    Thanks for that link.... the instructions tab on that site explains it much better than I ever could

    http://www.envirotechcoating.com/Alu...structions.pdf
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

  9. #9
    Join Date
    Nov 2006
    Posts
    402

    Default

    thanks for all the helpful tips guys..
    sorry i left out how it got corroded. its 5/8" x 4" flat stock that sat out in the rain and heat for about 3-4 weeks. got corroded on the areas in between each piece.... some areas are very grey and some almost black areas..
    thanks again guys
    Syncrowave® 200
    Lincoln AC/DC 225/125
    Lincoln Weld Pak 100 wire feed

  10. #10
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,383

    Default

    I take stainless toothbrush, brush up the joint and weld it. If its got oil on it take a little shot of brakekleen and rinse it off, air it all out before welding on it. Even stuff exposed to weather usually simply toothbrush up and get on with my life, not every joint needs to be for the space shuttle. Most of the time really don't even use the foot pedal or have it set to floor it.
    Attached Images Attached Images
    Last edited by Sberry; 05-17-2012 at 11:32 AM.

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