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  • 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
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  • #2
    cleaning corroded aluminum

    I use acetone for a cleaning solvent.
    Kevin

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    • #3
      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 inch wire wheel and rip it.

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        • #5
          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
            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 amazon.. not cheap but a gal will last quite a while...

            http://www.amazon.com/gp/product/B00...DST6O3EPD4O5S3

            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, 02:27 PM. Reason: spelling..
            .

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            • #7
              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/
              sigpic

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              • #8
                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:
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                Millermatic 350P w/25ft Alumapro & 30A
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                • #9
                  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
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                  • #10
                    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 Files
                    Last edited by Sberry; 05-17-2012, 11:32 AM.

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                    • #11
                      Originally posted by FABMAN View Post
                      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
                      Sounds like just normal oxidized aluminum. Do like Sberry stated, rub with a SS wirebrush. Wipe the dust off with a clean dry rag, then weld.
                      Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

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                      • #12
                        No no no no to brake cleaner

                        The chemicals in brake cleaner combined with the heat and gas from your welder can produce phosgene gas which can be seriously harmful or fatal. Just type phosgene gas and welding in your browser. There are many articles, here is an example. http://www.brewracingframes.com/id75.htm stick to acetone for removal of oils as it leaves no residue, and acid and or wire brushes for corosion and scale.

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