finishing.com -- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 11563

Coatings for Aluminum to be used in high purity applications


2001

I am working on a new design for a pressure vessel that will store both De-Ionized water and hydrogen at approx. 300 PSI. I would like to build it out of Aluminum but I cannot have anything leech out of the aluminum. What coatings are there available that are very inert, not terribly expensive, and stay on the aluminum.

Richard Dubey
- Rocky Hill


2001

Tin is about the best coating on metals to resist corrosion from water, as the solubility of tin oxide is very low. A conformal thick plating of pure tin is a standard for storing high purity water. If the purity requirements are not in the ppb range and the pH of the water never falls outside of a 6-8 range, a transition metal oxide would probably be sufficient. Conformal coating and 100% coverage is key, especially with aluminum.

It is going to be tough to store hydrogen at 300psi in aluminum for any length of time, however, as hydrogen can and will diffuse into and through the aluminum (hydrogen will diffuse through steel too).

Dale Woika
- Bellefonte, Pennsylvania, USA


2001

Electroless Nickel is used on the inside of aluminum cylinders for hydrogen storage . I would think electroless nickel would be fine for DI water also.

Todd Osmolski
- Charlotte, North Carolina, USA



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS



Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2018 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.