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topic 11791

Tantalum plus Platinum coating of titanium


Is it possible within reasonable costs, to apply on a titanium rod, one layer of tantalum and a second layer of platinum. Total thickness 25 µ (25/1000 mm).

We have Titanium rods with dia. 1"-4" from 0,3-1,8 m long, which we will apply two layers. Layer one with Tantalum and layer two with Platinum, --total thickness approx. 25 micron. It is important with non porous surface. Question: Which kind of process/technique is advised, regarding economy and quality for fastest possible production?

Looking forward for an answer.

Best regards,

Stig Motroen
aerospace - Hamar, Norway


It all depends on what you mean by "reasonable cost". It's certainly possible to sputter deposit the metals onto the rods to the thickness that you want. But platinum is not cheap. You'd have to incur the cost of the targets. Of course, you can recover much of this cost by recycling the material after the deposition.

Titanium could pose some problems in the deposition process, as the oxide forms pretty quickly. It would be best to sputter clean and put down the first coating layer at low temperatures. At high temperatures, the oxide is very difficult to remove.

jim treglio portrait
Jim Treglio
PVD Consultant - San Diego, California


Sir I want to know more about coating of Tantalum over titanium and plating of Platinum over titanium. I want to know the plating bath composition and plating conditions for both Ta and Pt

Savari Kulandaisamy
- Karaikudi, Tamilnadu state, India


I believe the ASM Metals Handbook Vol. 5 Surface Engineering has chapters on those subjects, Savari. It is difficult to plate onto titanium, and special pretreatment cycles will be needed as described in that book. I don't believe that tantalum is an electroplateable material; I think you'll need to sputter coat that.

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


We undertake electrodeposition of platinum on titanium. We want to know pretreatment necessary to electroplate platinum on tantalum and niobium. Please advice.

Harish H. Madhani
electroprocessors - Pune, Maharashtra, India


See Durney's ELECTROPLATING ENGINEERING HANDBOOK for a plating cycle for Niobium, page 195.

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Tom Pullizzi
Falls Township, Pennsylvania

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