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topic 1762

Amperage requirements and solution concentration for anodizing titanium


(1998)

Q. I am trying to anodize a large piece of 6/4 titanium, 105" x 16" x 3/4". I am looking for information on the amperage requirements and what difference I can expect from different solutions. Also, does alloying of the titanium make any difference. I would be grateful for any help.

Thank You,
Jim

Jim Schweikert
- Las Vegas, Nevada


(1998)

A. I have experience with anodizing small parts in titanium (commercially pure grade 1 and Ti 6Al 4V) and niobium, but nothing as large as your part. The current densities that I use vary from about 5 amps per square inch to less than an amp per square inch. I suggest that you start out on the lower range to avoid accidentally etching the piece. I use a solution of 3-5% by weight trisodium phosphate [linked by editor to product info at Amazon] in water. Keep the solution below 80 degrees fahrenheit. I get more vivid colors on the 6-4 than the cp titanium, probably because it seems to take a higher finish easier. If you do not already have a suitable tank, you might try anodizing the piece with a brush saturated with the solution connected to the positive lead and the piece grounded to complete the circuit. You could use a painter's brush with the metal ferrule wired to the lead and then insulate the handle for safety. Artists use this technique to paint on sheets of Titanium.

Howard Bailey
custom body jewelry - Flagstaff, Arizona


May 28, 2012

Hi, Howard. Thanks for the clear answer.

Readers: We have many threads on anodizing of titanium; please use the Google Custom Search box near the top of the page to search the site for "Anodizing Titanium". Good luck.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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