From my personal experience I know gold and platinum work well.  We
have a paper in Langmuir that uses Tungsten microwires as a substrate
and electrodeposits gold and platinum.  The paper was for wires so if
you want to deposit on a chip, you may have to adapt the procedure a
bit.

Conical Tungsten Tips as Substrates for the Preparation of
Ultramicroelectrodes.  Langmuir, 22 (25), 10348 -10353, 2006.

Best,

-Richard

Richard B. Keithley
UNC Analytical Chemistry Graduate Student &
National Defense Science and Engineering Graduate Fellow
Wightman Research Group
Chapel Hill, NC 27599
919-962-1108

Quoting Andrea Mazzolari :

> Hi all,
>
> i need to deposit about 20um of any metal on tungsten.
> Could someone suggest a metal which have good adhesion to tungsten and an
> appropriate deposition technique ?
>
> For my understanding Titanium deposited by electrodeposition should work
> fine, but i don't have a big experience.