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Material of construction for anodize strip tank (phosphoric/chromic acid)
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Can anodize stripping solution, ie phosphoric/chromium trioxide be used in a stainless steel tank for heating and stripping, or should it be stored and used in a plastic vessel/tank?
Kind regards
Steve Poweranodizing shop - Nelson, Australia
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I would go with the stainless tank on this one..I believe 316L is recommended, the plastic tank would have to be heavily reinforced due to the temperature of the chrome/phosphoric mixture.
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Marc Green anodizer - Boise, Idaho |
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Steve.
The ignoranti, such as myself, could far easier answer your question if we but knew the temperature of the mix ... and also the tank size/capacity would be a useful guide.
Marc is maybe 100% right in promoting a stainless tank as he is more aware than I am of the temperatures.
But here's a guide on the dual laminates, ie. professionally made fiberglass reinforced armored thermoplastics based on max. service temperature for pipe @ around 100 psi. However, I'd play safe and NOT weld on any outlets but use tank adaptors as I think that you might get stress cracking around the welds of PE and also with PP.
Cheers (and where the heck is Nelson in Oz?)
- PVC 80 degr. C
- CPVC 90
- PP 80 PVDF 140
- FEP 200 one of the weldable fluorocarbons
- CPVC 90
You might try the 'local' manufacturer (Engel process) of rotationally molded Poly tanks. They should be good for a max. temp. of 150 degr. F ... and if rectangular (we have them to 500 imp gals in Canada) they can 'bow' so they'd need some horizontal stiffeners (wood, metal, whatever).
| Freeman Newton - White Rock, British Columbia, Canada | Ed. note: Please keep Freeman in your thoughts & prayers. Message from Freeman, Dec. 2010 |