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Anodizing titanium
Letter 1265
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We want to anodize titanium using an alkaline anodizing
bath. Who can give use the formulation of a alkaline
anodizing bath. We want to get a gray coating.
Any advice would be appreciated.
J.H. Pennings
TNO Institute of Industrial
Technology - Netherlands
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See AMS2488 [link is to spec at TechStreet] -
the anodizing is performed in an alkaline solution of pH
>= 12 (going by memory only, may be pH >13). Unlike
anodizing aluminum, the colour is not uniform and not
controllable (almost). Depending on the alloy (and
solution?!), we are getting yellow to blue through grey
appearance.
Max
Max Stein
captive metal finisher - Montreal, Québec,
Canada
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With titanium in a bath of
Trisodium Phosphate [link is to product info at Amazon]
you get the most beautiful color of blue imaginable. All you
need to do is to immerse the part, turn on the current and
voilà , bright blue. Not gray but close??
Dave Fairbourn
- Sandy, Utah
Thanks Dave. To minimize confusion, though, we need to
tell the readers that there are two general types of
titanium anodizing. The "alkaline anodizing" that Max speaks
of is a heavy, wear-resistant, anti-galling surface for
engineering applications. The acid or neutral anodizing you
are describing is a very thin very colorful diffraction
coloration for decorative jewelry and similar applications.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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A true grey from TSP is not probable.
Brown, blue, silver, yellow, purple and green are
possible at voltages up to 200. There are several different
shades possible for each. Precise color requires precise
voltage control. It anodizes nearly instantly. Surface prep
makes a significant difference in the luster or look of the
product. Does not need any further protection after anodize.
From 10% to 3% solutions are recommended.
James Watts
- Navarre, Florida
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A magazine called Xtreme R/C Cars will publish an article
on ti anodizing in an upcoming issue. Sorry I don't know
what month, but issue 4.9 I think. I am interested in ti
& alum anodizing, and would like to obtain a red color.
Any info is greatly appreciated.
David Thomason
Glendale, Arizona
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The color red is not possible with titanium anodizing nor
is black. Apparently neither exists in the spectrum created
by the oxide layer formed on the surface. The color exists
only as reflected light.
Dennis Rand
- Plymouth,
Massachusetts
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I am anodizing a 6al-4v ti medical device blue, yellow
& green. These parts are subjected to 250 F steam
autoclaving for sterilization. Some of the parts after two
cycles of autoclaving (40 min/cycle)are beginning to change
to the next color. (yellow - magenta, blue-clear). This is
only happening in a few parts but I need help into why it is
happening and how to stop it. If anyone has suggestions I
would appreciate the help.
Jim Johnson, Sr.
Design Eng.
- carlsbad, California
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We can produce and reproduce stable and controllable colors for
titanium anodizing. Technology is ready for licensing.
You can see shades available on our web site. Black color can be
obtained also, but this is a different technology.
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March 3, 2006
Dear Sirs,
I am a manufacturer of Orthopedic Implants made of S.S. 316L
and Ti-6AL-4V ELI. I am looking for Anodize per
AMS2488 [link is to spec at TechStreet]c Type I
Colors (Pink, Gold and Green).
It will of great help to me if you can tell me the procedure
for it.
Thank you.
Lokesh Jokiani
- Delhi, India
August 8, 2006
I am new to the anodizing process and am having problems
anodizing titanium green. The pieces are about 2 and a half
inches long and are a half inch wide. When I anodize these
pieces in other colors I have very little to no problems. I
was wondering if this could be environmentally affected
(humidity) or is this a normal problem for larger pieces.
Terry Donnalson
hobbyist - Lititz, Pennsylvania
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April 12, 2007
Alkaline Anodizing of Titanium Ti-6AL-4V. I am looking for the
exact bath solution for what I have been told is a type II anodize
per AMS2488 [link is to spec at TechStreet]D.
I understand that it is >/=13 pH and that the temperature is
controlled to +/-2 F and that voltage is the controlled
characteristic, but WHAT is the chemical?
Vicki Dominguez
medical device industry - Huntington, Indiana
June 2, 2008
Hi, Vicki. I know it's strange and you'll say "how can that be?",
but . . .
- even though the alkaline anodizing process is covered by AMS
spec . . .
some of the details of the alkaline anodizing process are trade
secrets. You have to figure out these details for yourself, or you
have to retain a consultant who will give them to you; you won't find
them in the literature or in a public forum. Sorry, and admittedly it
makes no sense, but there it is :-)
Regards,
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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May 2, 2008
Dear sir,
I try to anodize titanium size 1" x 4" to pink and green
color by use TSP and Borax but the color not pure, for pink
color will have light blue and green color will have yellow.
And it not shiny like gold,purple or blue that I do the same
method. What solution I have to use for high voltage
anodized and more method I should do?
Thank you and very best regards.
Thita M. ( from Thailand )
Thitaree
Manosittisak
- Bangkok, Thailand
December 7, 2008
We can do titanium anodising Green, Blue, Purple, silver,
etc.
But yellow and black is nitride treatment, not
anodising.
We need help of anodising red for titanium, as we now have
pink color, but not red.
Fun Hsu
titanium - Ningbo, China
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February 12, 2009
Hi,
I wonder if someone could instruct me as to what solution is best to
achieve an anodized silver finish on 6AL-4AV grade 5 titanium.
I would also appreciate information on setup and procedure i.e.
precleaning procedure, anode/cathode ratio, suitable materials for
cathode and jigs. I also need information on voltage/time and
amps.
I would be very appreciate if anyone could provide this kind of
information.
Simon Metaxas
- Birmingham, west midlands, United Kingdom opt
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