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  1. #1
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,718

    Default Molasses rust removal

    I recently bought a 20L tub of molasses , dirt cheap . I am pleasantly pleased with the results. Maybe the Summer heat has helped the process along .I used a strong mix maybe 4:1 water

    The rusty parts are from a 1940 Morris army truck .

    mol1.jpg

    mol2.jpg

    mol3.jpg

  2. #2
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Yes it works like magic. I do not think a strong brew makes any difference over a 10:1 mix.
    Gold, the colour of choice for the discerning person.

  3. #3
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    Don't ask me how know, but beware of it on cast iron especially exhaust manifolds.

    We were going to weld up a somewhat dodge fire engine cracked manifold when we had a rush of excrement to the brain idea to soak in a molasses mix.

    The consensus was about 9:1 water to molasses mix.We forgot about it and it was left submerged some 3 weeks.

    When removed the mix had eaten the carbon out of the cast iron leaving it looking like a sponge.

    The remaining metal ,however was very clean.

    Grahame

  4. #4
    Join Date
    Mar 2009
    Location
    Melbourne
    Age
    54
    Posts
    825

    Default

    Molasis definately works faster when the solution is warmer so summer time is better in our southerly latitudes.

  5. #5
    BobL is online now Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    If you had a lot of stuff to do agitation should also speed things up.
    Something like a small (non-magnetic) pump, say from a washing machine would be the go,

  6. #6
    Join Date
    Apr 2008
    Location
    Canberra
    Posts
    805

    Default

    I did a heap of parts for my FJ in molasses a year ago. Did it in summer and it was fast (2 weeks) but bloody messy and stinky. Even after cleaning in hot soapy water the parts reeked for months. I wouldn't do it again. I would just knuckle down with a wire wheel on bigger beats and use electrolysis for the smaller stuff.

  7. #7
    Join Date
    Dec 2014
    Location
    Goldcoast
    Posts
    78

    Default

    I got A 20 l tube 12 m ago and did some tests ... works well on the right steel but if it has impurities it can go honey comb like Grahame mentioned ... always best to do a test first .. if you can ...

    I put a sealed lid on at first to shelter from the rail ... end up popping the lid.. put some plastic with a rope which worked since it let the gasses out...

    Make sur you check it every few days just to make sure there is no crap steel in the mix...

    If ok gets into all of those nooks and crannies ...

    Randal

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