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Unread 09-03-2014, 03:24 AM   #1
y2k-fxst
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Hot Dip Galvanized Tub?

When I get my frame done for my CJ6 I am figuring on hot dip galvanizing it. Got to thinking, what about doing it to the entire tub prior to Bondo and paint. Figure if I replace all the metal and delete the wood in the support channels prior it should help the body hold up.

Has anybody else tried this before?

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Unread 09-03-2014, 04:39 AM   #2
HackFabrication
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The temperature of the molten zinc will probably warp the heck out of the body panels.
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Unread 09-03-2014, 05:03 AM   #3
EZCJ
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I purchased a replacement tub a few years back. The vendor suggested a spray on bed liner underneath the tube and inside the tub. The spray on liner looks like it is holding up quite well.
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Unread 09-03-2014, 07:10 AM   #4
Jim1611
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I fabricate allot of things that get hot dip galvanized and when it came time to do the frame off on my CJ I did get the frame done. It turned out fine. I would not consider the tub though. As Hack mentioned it will warp the sheet-metal. Another problem you'll have is in the process itself. The part is submerged in 5 different tanks throughout the process and each has to drain off when it's lifted out of the tank. There are places where the liquid will get trapped and taken to the next tank which will cause problems. Another thing that will happen is air will get trapped in pockets as it's lowered into the tanks so not all of the metal will get treated correctly. In theory it would be great but it's just not practical.
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Unread 09-03-2014, 09:30 AM   #5
y2k-fxst
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Well, at least it sounded like a good idea. That's why it is nice to have a place like this to bounce ideas around.
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Unread 09-03-2014, 10:08 AM   #6
HackFabrication
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Quote:
Originally Posted by Jim1611 View Post
Another problem you'll have is in the process itself. The part is submerged in 5 different tanks throughout the process and each has to drain off when it's lifted out of the tank. There are places where the liquid will get trapped and taken to the next tank which will cause problems. Another thing that will happen is air will get trapped in pockets as it's lowered into the tanks so not all of the metal will get treated correctly.
When I had my boat trailer dipped, the company gave me specific instruction on where to drill 1/2" or larger holes so that the various liquids could drain. They also warned that attempting to submerge an airtight frame into hot zinc would cause the air to expand and possible deform (bulge) the steel tubing. In addition they didn't want hot zinc getting blown all over when something came apart. I did what they said, and the trailer came out beautiful. Still looked good when I got rid of the boat/trailer seven years later.

Hot dipped parts aren't meant to be top coated either. The zinc is applied thicker than zinc that is electroplated. When I worked at the plating company most of the zinc plated parts went out either with a 'bright dip' (faux chrome) or a di-chromate (yellow) finish.
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