de-rusting box section internals

  1. bigegg

    bigegg I drink and I know things. Its what I do.

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    i'm in the process of converting a caravan chassis into a box-van trailer cum workshop shed.

    its an old chassis, not galvanised and with a fair bit of surface rust. nothing terminal, however.

    its all 3mm c- section, except for the main front-back beams which have been enclosed by a piece of 3mm plate, for a length of about 6ft.

    as far as i can see, the inside of this "box" is as rusty as the outside.

    is there a clever way of derusting it, prior to coating with rustproofer?

    i'm going to derust the accessible bits with a wire brush, then paint the lot - I' m thinking a high zinc primer, and then lathering with underseal.- its likely to spend a lot of time being dragged across grass fields for car boot sales.

    IMG_20190921_114343.jpg IMG_20190921_114356.jpg IMG_20190921_114401.jpg
     
  2. gaz1

    gaz1 Forum Supporter

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    grinder wire wheel but be careful with it
     
  3. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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  4. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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    Bit of twin and earth in a conduit. Spin it with a drill and split the ends to act as a flail
     
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  5. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    FP200 works as well, I have few miles here.
    Done similar on 4 Die Holders handles to day.
     
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  6. bigegg

    bigegg I drink and I know things. Its what I do.

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    ta very much.
     
  7. 8ob

    8ob Forum Supporter

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    Rust cant continue without moisture and air, just blast wax up there when you have finished welding bits to it . We can all get a bit hung up on the "rust" word when in reality it can be a better coating than paint.

    Bob
     
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  8. bigegg

    bigegg I drink and I know things. Its what I do.

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    couldnt get a grinder wheel in without an 4ft extension arbour
     
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  9. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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    Use it on trials bike exhaust pipes to clean the crud out.

    Sticking them on a hot plate in the garden works well too but there never shiny again.
     
  10. CompoSimmonite Member

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    Cut the web out, derust to your satisfaction then reweld in the web ?
     
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  11. ronan

    ronan Forum Supporter

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    Take it to the local sandblasters ? Blanket bomb it with 2k epoxy after.
     
  12. bigegg

    bigegg I drink and I know things. Its what I do.

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    thats going to be favourite i think - irs onlt half a dozen 1in welds
     
  13. rtcosic

    rtcosic Member

    You didn't tell us that crucial piece of information and I was too lazy to zoom in on your photographs.

    I do like the flail in a tube though and have added that to my portfolio of rust treatments to experiment with - along with electrolysis, citric acid, oxalic acid, hydrochloric acid with hexamine, phosphoric acid, wire brushes, sand/grit/bead blasting, needle gun, scraper................
     
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  14. bigegg

    bigegg I drink and I know things. Its what I do.

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    i didnt spot it myself at the time of the OP : they sort of blend in with the rust.
    :rolleyes:
     
  15. rtcosic

    rtcosic Member

    I believe you. I'm gullible like that.
     
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  16. bigegg

    bigegg I drink and I know things. Its what I do.

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    you do know that word is disparaged now?

    its even been removed from online dictionaries.

    :whistle:
     
  17. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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    Huh. Who'd have thought it...
     
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  18. Pigeon_Droppings2 Member

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    Make a giant citric acid bath...some DPM and bits of wood to form a shallow pool...might have to figure a way to agitate things.
     
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  19. bigegg

    bigegg I drink and I know things. Its what I do.

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    i had actually considered that. :laughing:
     
  20. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    :scared::scared::scared::scared::scared::scared::scared::scared::scared::scared::scared:DC Arc welder for sale:whistle:
     
    • scared[1].gif
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