Galvanizing or Powdercoating?

Discussion in 'General Discussions and Advice' started by Tiger eye, 3 Dec 2012.

  1. Tiger eye

    Tiger eye

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    Hi guys I'm busy building a 1220 X 450 X 460 tank with a 3ft sump. I have to deside what to do with the stand: Galvinizing or Powdercoating.
    Which is better and what can I expect to pay for a stand for my size tank? Stand will be 38 X 38 X 3mm square tubing and +- 1m high.
    And also a place that you would recommend to do the coating.
     
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  3. Tiger eye

    Tiger eye Thread Starter

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    Here is a pick of a simalar desighn.

    picture.jpg
     
  4. dallasg

    dallasg Moderator MASA Contributor

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    Powder coat , hot dip galvanizing can warp stand
     
  5. Nemos Janitor

    Nemos Janitor

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    25mm angel iron will be fine. On a marine tank galvanising IMO has been more better.:)

    IMO very over enginered for a 4ft tank.
     
  6. brentnorm

    brentnorm

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  7. RiaanP

    RiaanP Moderator

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    Both options and you cannot do any changes afterwards. So you need to be sure that your design is done.

    Powdercoating got options in regards to colour. But obviously does not matter if you put a cabinet around it.

    After 4 years, powdercoating will start to show places where rust comes through.

    Galvanizing, you need to ensure that all the square tubing got breathing holes. If the tube is welded up and sealed, then the air inside will explode the tube open when it gets dipped into the hot liquid. And you pay for weight gain. So after the dip, they lift it out. The tubes need to be able to drain, else you will pay for all the clogged up galvanize inside the stand. Plus you need to check that they do not put the stand down to hard, The bigger the more of an issue. Due to be so hot, it can bend extremely easily when they bliksem the stand down on the ground after the dip.

    I done my stand in powdercoating at a place out in Pretoria east, on the way to Maizey plastics, cannot remember the name now.

    Other option is to use 3 to 4 coats of Hammerrite paint.
     
  8. Tiger eye

    Tiger eye Thread Starter

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    I used 3 coates Hammerrite on my 3ft and after 3 years it has rusted all over. So I dot want to go that rout again.
     
  9. Tiger eye

    Tiger eye Thread Starter

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    This is after 3 years.

    IMG-20121203-01090.jpg
     
  10. Tiger eye

    Tiger eye Thread Starter

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    Can I paint over Galvanising? Can I use normal spray paint?
     
  11. Nemos Janitor

    Nemos Janitor

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    We have many years of experience with tank stand types. Galvanised angle iron are "more better":p by far.
     
  12. Nemos Janitor

    Nemos Janitor

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    You can paint or powder coat over if you want.
     
  13. King Fish

    King Fish

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    Painting over hot dip galvanizing (called duplex coating) is the best. The zinc coating over the steel from galvanising is sacrificial which means it sacrifices itself to protect the parent metal. Basically the zinc becomes the anode and the steel the cathode (such as a sacrificial anode installed below the waterline of a ship.) The paint adds further protection by protecting the zinc coating and shielding it from ionic compounds. Make sure you degrease the frame after galvanising as the quenching process leaves an oily residue which is not optimum for paint adhesion. Use plascon galvanised iron cleaner then rinse with water. Apply a coat of Plascon metalcare primer then final coat as per their specification.
     
  14. Tiger eye

    Tiger eye Thread Starter

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    Thanks alot for the ansers. I apretiate it.
     
  15. Munky82

    Munky82

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    lol...have seen this before...
    by the coast even your dingis will rust :p
    I vote for galv and paint.
     
    Last edited: 3 Dec 2012
  16. Andreas

    Andreas

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    Definately look at galvanising. I've had a couple of water spills without being able to clean under the tank and after about 2 years, hardly any rust.

    As long as you drill a couple of drainage holes at the right places, it will be fine. I paid for my stand which is bigger than yours, somewhere in the region of R500
     
  17. Tiger eye

    Tiger eye Thread Starter

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    Ok I changed the desighn to 38 X 38 X 3mm angle iron and galvanising. Can any body recomend a place in or around Centurion or pretoria?
     
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