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  1. #1
    Join Date
    May 2004
    Location
    Sunshine Coast Queensland
    Age
    54
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    0

    Default Help - Acid stained concrete

    Anyone know what I can use to clean a battery acid stain off concrete - it's left a big white stain even after a decent hosing down.
    More important than the stain is that one of my cuts is in to everything so I've had to lock him inside until I can clear this up.

    Cheers

  2. #2
    Join Date
    Jun 2006
    Location
    East Warburton, Vic
    Age
    54
    Posts
    3,542

    Default

    The acid hasn't stained the concrete, it has cleaned it. Now that you have hosed it down you have neutralised the acid, so it is safe now.
    Cheers

    DJ


    ADMIN

  3. #3
    Join Date
    May 2004
    Location
    Sunshine Coast Queensland
    Age
    54
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    0

    Default

    Ok next question.
    The driveway is faded black in colour, how do we recolour the clean part - this is a rental place and where the acid has been is very noticeable.

  4. #4
    Join Date
    Aug 2005
    Location
    Queensland
    Posts
    613

    Default

    The faded black is mould, hire/buy a water blaster - Karcher/Gerni type and spray blast the concrete clean. Within a couple of weeks you shouldn't really notice the difference.

    Bob

  5. #5
    Join Date
    Mar 2004
    Location
    Carine WA
    Age
    75
    Posts
    110

    Default

    Quote Originally Posted by DJ's Timber View Post
    The acid hasn't stained the concrete, it has cleaned it. Now that you have hosed it down you have neutralised the acid, so it is safe now.
    Water DOES NOT NEUTRALISE ACID! Water ONLY weakens the solution. The acid will remain active until it has lost ALL its acidity by a chemical reaction with the material with which it is reacting. There ARE chemicals that CAN neutralise the acid, though I don't know what to suggest.

    Many years ago my BIL painted his trailer in our driveway. He used hydrochloric acid to wash away the overspray on the concrete agregate driveway. He DID hose it down extensively, however over the next few months the acid continued to eat into and leech away the cement in the concrete and much of the small blue metal agregate became loose. The "corrosive" action eventually stopped but it took quite some time, ie a few months.

    There used to be a product available for this neutralising action, but it does not seem to be available now.
    Kind Regards

    Peter

  6. #6
    Join Date
    Jan 2008
    Location
    Santa Clara Utah
    Posts
    6

    Default

    We do alot of acid stained concrete around here and I use it sometimes on my concrete countertops. It takes quite a lot water to wash away acid so neutralize it with ammonia, about a cup per 3 gal. (5L?). Add the ammonia to the water not the other way around. Pour it on, it works instantly, broom around, hose off. You can also use vineger.

    Paul

  7. #7
    Join Date
    Oct 2006
    Location
    Tallahassee FL USA
    Age
    82
    Posts
    0

    Default

    Quote Originally Posted by solid art View Post
    You can also use vineger.

    Paul
    Might have your chemistry barse ackwards, Paul. IIRC, vinegar is also acid.

    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain

  8. #8
    Join Date
    Jan 2004
    Location
    Sunshine Coast. Qld
    Age
    79
    Posts
    42

    Default

    Does not Baking Soda neutralise battery acid?
    That's what I use to clean up my car battery.
    Last edited by David L; 21st January 2008 at 05:34 PM. Reason: wrong product
    David L
    One of the great crowd beyond the bloom of youth on the Sunshine Coast

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