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  • Removing rust in a mc gas tank.

    Aloha,
    What's the best way to remove surface rust inside a motorcycle gas tank?
    Thanks, Dean.

  • #2
    Re: Removing rust in a mc gas tank.

    I usually use muriatic acid, like they use to clean cement. You have to be careful. If you don't use a tank sealer it go right to rust in no time. I'm pretty sure Caswell has a tank sealer. SS
    Last edited by sswee; 10-21-2005, 12:57 AM.

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    • #3
      Re: Removing rust in a mc gas tank.

      hey sswee it that to say that muratic is good for derusting all steel. if so at what concentration? i am doing an old gas pump and the frame work is rusty and i dont feel like taking all the time it will need to blast it from rust to clean. if i can derust it first it will speed the job up.
      artmusic247 sorry i am not meaning to highjack your thread but i have heard of this before and was curious. also when you are done you should reseal the tank with http://www.caswellplating.com/aids/epoxygas.htm or kreem gastank sealer.
      when in doubt polish it out/ why replace it when you can refinish it
      G2 Polishing and Powdercoating

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      • #4
        Re: Removing rust in a mc gas tank.

        I have only used it on fuel tanks but I don't see why it wouldn't work. I'll have to check the jug to see what concentration it is. I use it straight from the jug. I buy it at a local farm supply, but I've seen it other places in a white one gal. jug. SS

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        • #5
          Re: Removing rust in a mc gas tank.

          Thanks for the advice. You people here are very polite, pickleboy.
          sswee, you said you bought muriatic acid at a farm supply store, what are farmers using muriatic acid for? Are there other places where they would sell it?
          Thanks, Dean.
          Last edited by artmusic247; 10-21-2005, 10:49 AM.

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          • #6
            Re: Removing rust in a mc gas tank.

            Guys:

            Muriatic acid does dissolve rust. It ALSO dissolves steel! While it dissolves rust hundreds (?) of times faster that steel, you have to monitor it closely so it doesn't eat to much raw steel.

            I blew it once. Had some small surface-rusted #4 & #6 nuts, bolts & washers, so I tossed them into @ 20% solution, then proceeded to forget about them for more than 2 days. The washers had disappeared entirely, and the nuts and bolts were unrecognizeable!

            Muriatic acid is just dilute Hydrochloric acid. I don't know what the ratio is off hand, but it's still fairly strong. The plating manual recommends 2 or 3 different "pickle" concentrations for removing light rust/medium rust, etc.

            I use a 5% concentration as a final pickle just before plating a part. That way I KNOW it's rust-free.

            It's available in normal hardware stores, and is fairly cheap.

            Sean
            Seans Zinc Plating page

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            • #7
              Re: Removing rust in a mc gas tank.

              That was the part where I said, you have to be careful. Maybe I should have clarified. Any chemical should be monitored carefully when in use. I have left hanging wires in anodize stripper to clean for reuse, gotten side tracked and come back to nothing but little pointed pieces no good for anything. The muriatic acid needs to be applied, left usually for only 2 to 5 minutes, rinsed well and checked. It is like working with alot of other substrates, better to go a little at a time than to go too far. SS

              Most hardware stores, masonry supplies carry muriatic acid.
              Last edited by sswee; 10-21-2005, 01:03 PM.

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              • #8
                Re: Removing rust in a mc gas tank.

                To remove Chrome and Rust
                first you will need a tank large enough to hold the part a piece of stainless steel size depends on the part you are de plating a power source battery charger will work
                there are different type of Acid Pickles they are explained in greater detail on pages 34 35 and 36
                of the Caswells Plating Manual
                WARNING ! Never pour water into Acid always pour acid into water
                Pickle 1 used for mild etching before plating
                to make this solution
                20 parts fresh water to 1 part muriatic Acid for etching soak part for 1 to 15 minn 1 hour will remove rust from most steel

                Pickle 2 also rust remover and de- plater
                to make
                2 parts fresh water 1 part muriatic acid
                to remove Chrome hook you positive lead to you part and your negative lead to the stainless
                adjust your power to 1 amp per sq inch de-plating should be complete in approx 15 to 20 minn
                DO NOT use this method on Pot metals or aluminum !!!!
                Last edited by jimcarry; 10-21-2005, 01:30 PM.
                Jim Eaton

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                • #9
                  Re: Removing rust in a mc gas tank.

                  Originally posted by artmusic247
                  Aloha,
                  What's the best way to remove surface rust inside a motorcycle gas tank?
                  Thanks, Dean.
                  The Kreem kits have deruster, sealer and catalyst all in one kit. You put some nuts and bolts in with the deruster to help loosen up the rust (tip: make sure you use ferrous nuts/bolts so you can use a magnet to get them out if you have to - don't ask me how I know...).

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                  • #10
                    Re: Removing rust in a mc gas tank.

                    I wish you folks would of told me that it desolves metal before I used it, I thought that someone stole my gas tank! Just kidding. I'm going to be looking around for muriatic acid this weekend. What kind of skin protection should I be using when working with muriatic acid?
                    Thanks again for the help, Dean.

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                    • #11
                      Re: Removing rust in a mc gas tank.

                      The usual for acids, black rubber gloves, eye protection and have a garden hose or someway to flush if it splatters on you. The muriatic I get is about the same as battery acid if you get it on you. You don't want to palm the fill hole and stick a finger in the pitcock hole bare handed to rotate the tank all around. No shorts or flip flops.

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                      • #12
                        Re: Removing rust in a mc gas tank.

                        Originally posted by artmusic247
                        I wish you folks would of told me that it desolves metal before I used it, I thought that someone stole my gas tank! Just kidding. I'm going to be looking around for muriatic acid this weekend. What kind of skin protection should I be using when working with muriatic acid?
                        Thanks again for the help, Dean.
                        should be able to buy the acid at your local pool supply or Hardware store
                        Jim Eaton

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                        • #13
                          Re: Removing rust in a mc gas tank.

                          Thanks for all your help. Dean.

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                          • #14
                            Re: Removing rust in a mc gas tank.

                            Dean:

                            If you use our tank sealer, there's no need to remove the rust first. It actually prefers to adhere to a rusty tank than a smooth tank.

                            Before coating, tank and handful of nuts and bolts, and some lacquer thinner and shake them around in the tank. This will dislodge any large particles of loose rust. Then let it dry and then use the sealer.
                            --
                            Mike Caswell
                            Caswell Inc
                            http://www.caswellplating.com
                            Need Support? Visit our online support section at http://support.caswellplating.com

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                            • #15
                              Re: Removing rust in a mc gas tank.

                              Rust Removal using Electrolysis.

                              Try this site, it might save you some time and be less toxic!

                              http://antique-engines.com/electrol.asp

                              John

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