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Technical Zinc Chromate Primer Question

Discussion in 'The Hokey Ass Message Board' started by mickticulus, Nov 15, 2020.

  1. mickticulus
    Joined: Dec 16, 2005
    Posts: 183

    mickticulus
    Member

    My dad was cleaning out the attic of the garage recently and found this Aero Klad zinc chromate primer along with some Imron so he brough it over thinking I could use it. It has been there at least 40 years. I'm not a painter so I'm wondering if it is useful or should it just be recycled? I appreciate any insight! Mick


    IMG_4506.JPG
     
  2. Bugguts
    Joined: Aug 13, 2011
    Posts: 710

    Bugguts
    Member

    Recycle the contents, but keep the can. It’s cool.
     
  3. Ralphies54
    Joined: Dec 18, 2009
    Posts: 750

    Ralphies54
    Member

    That stuff is especially formulated for the Aircraft industry as a primer for aluminum and magnesium, but it works just as well on steel too. Although after 40 years I wouldn't trust it. Ralphie
     
    dsiddons likes this.
  4. v8flat44
    Joined: Nov 13, 2017
    Posts: 786

    v8flat44

    Back in the mid 60s i worked at Erie Proving Grounds rehabing Herculese & Ajacks missles. We sprayed the interior of nose cones with Z C....no mask...no wonder i have sinus trouble. Get rid of it for sure. Bugguts has it...keep the can. When was the last time you saw one ?
     

  5. mickticulus
    Joined: Dec 16, 2005
    Posts: 183

    mickticulus
    Member

    Sounds like I will be recycling, definitely keeping the cans though. Thanks for the advice! Mick
     
  6. Lloyd's paint & glass
    Joined: Nov 16, 2019
    Posts: 4,868

    Lloyd's paint & glass
    ALLIANCE MEMBER

    Just sit them on the shelf! Been fine the way they are for a long time!
     
    Desoto291Hemi likes this.
  7. alanp561
    Joined: Oct 1, 2017
    Posts: 1,694

    alanp561
    ALLIANCE MEMBER

    If they haven't been opened and exposed to air, I'd shake and stir the hell out of them and use them. Then put the empty can on the shelf.
     
  8. rusty valley
    Joined: Oct 25, 2014
    Posts: 2,574

    rusty valley
    Member

    yup, if it stirs up then use it
     
    Gasser 57 likes this.
  9. pirate
    Joined: Jun 29, 2006
    Posts: 657

    pirate
    Member
    from Alabama

    Zinc Chromate was used extensively for aircraft/aerospace applications to prevent corrosion mostly on aluminum and magnesium although sometimes on ferrous alloys. The color was typically yellow although sometimes tinted to a yellowish green. It was highly effective in preventing corrosion but also effective in preventing organic growth such as molds. Unfortunately the hexavalent chromium contained in the primer is a carsinogen. It’s pretty much been banned by various organizations such as OHSA, EPA, etc. or has very strict requirements for use and safety. There are numerous substitutes still listed as Zinc Chromate but they contain little or no hexavalent chromium. If you want to keep the can I would just leave it sealed unless it has been opened before.
     
    Roothawg likes this.
  10. I agree, if it is unopened and is still liquid, just mix it well so all of the solids that may have settled out are put back into suspension. No real reason it can't be used, although you may not want to do on something that would be difficult to redo, just in case. It was used a lot in aerospace, over anodized (but unsealed) aluminum to provide good corrosion resistance under the topcoat. The anodizing was to aid adhesion. The active ingredient part is the hexavalent chromium, which is also on the carcinogen list. It will work on steel. Just wear proper PPE so you are not breathing in the vapors when painting or a lot of sanding. For that matter Imron is also bad for you, so same cautions. Imron has isocyanates as the bad for you part.
     
    warbird1 and Roothawg like this.
  11. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,632

    Roothawg
    Member

    The old Zinc Chromate has been pulled off the market because it has hexavalent chromium. They still sell it, but it has been reformulated to be more environmentally friendly. It's usually only an issue when sanded. Sort of like asbestos. We just spent close to a million bucks cleaning our hangars.
     
  12. The old stuff is the "good" stuff; I know cause I've stripped a lot of it over the last 35 years. If you have any aluminum to paint I'd use it (taking proper precautions) and then save the can. You can't get it anymore and the newer stuff doesn't work nearly as well.
     
    alanp561 and rusty valley like this.
  13. ronzmtrwrx
    Joined: Sep 9, 2008
    Posts: 647

    ronzmtrwrx
    Member

    Back in the early 80s, my dad and I stripped/prepped/ repainted a couple of early 70s Freightliner trucks. They had a light green primer on the aluminum. Would that have been about the same stuff?
     
  14. pirate
    Joined: Jun 29, 2006
    Posts: 657

    pirate
    Member
    from Alabama

    Most likely. Carbon black and a chromium pigment (green) was sometime added to zinc chromate primer to reduce the translucent zinc powder (yellow) to make it cover better. Zinc Chromate was widely used on anything made from aluminum. A lot of time the surfaces unseen were left in just the primer coating but was also used extensively for surfaces top-coated with various paints.
     
    Last edited: Nov 15, 2020
    ronzmtrwrx likes this.
  15. lippy
    Joined: Sep 27, 2006
    Posts: 5,556

    lippy
    Member
    from Ks

    Oh no! I should have been dead by now.
     
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  16. alanp561
    Joined: Oct 1, 2017
    Posts: 1,694

    alanp561
    ALLIANCE MEMBER

    me too
     
    warbird1 likes this.
  17. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,632

    Roothawg
    Member

    yep. I think I may have died in 97.
     
    warbird1 likes this.
  18. mickticulus
    Joined: Dec 16, 2005
    Posts: 183

    mickticulus
    Member

    Maybe what this was for. The previous homeowner was a truck driver.
     

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