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Passivation of Aluminum Cylinders

I need information on how to passivate aluminum cylinders prior to use and on the effects of heating the cylinders to remove moisture once the passivation coating is in place. Will the boil off of moisture effect the passivation coating? What are the effects of temperature on the metal structure and passivation coating? Any additional information on reaction mechanisms of NO or NO2 with aluminum would also be greatly appreciated. Any active aluminum sites will 'rob' the active ingredient in the cylinder fill and, with the tight product specifications in place, cause the cylinder to fail QC. Thank you for your help.

Mildred S. Weber
Consulting Engineering - Baton Rouge, Louisiana
2005

You don't say what chemistry you are thinking of when you refer to passivation, which is a generic term that could cover a number of different coatings. How about anodizing the item instead of chromate conversion coating or other passivation procedure?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2005

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