Letter 8042

Tank material for anodize strip 

+

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 Power
anodizing shop - Nelson, Australia

I would go with the stainless tank on this one..I believe 316L is recommended, the plastic tank would have to be heavily re-inforced due to the temperature of the chrome/phos mixture.

Marc Green anodizer - Boise, ID, USA

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 l00% 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 fibreglass reinforced armoured thermoplastics based on max. service temperature for pipe @ around l00 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 l40

FEP 200 one of the weldable fluorocarbons

You might try the 'local' manufacturer (Engel process) of rotationally moulded Poly tanks. They should be good for a max. temp. of l50 degr. F ... and if rectangular (we have them to 500 imp gals in Canada) they can 'wow' so they'd need some horizontal stiffeners (wood, metal, whatever).

Freeman Newton - White Rock, B.C. Canada

I want to post a question or inquiry of my own.

 

I want to answer this question publicly (in non-commercial fashion).

 

I am a supporting advertiser and want to reach the inquirer privately.