Metal finishing Q&As since 1989

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Platinized titanium suitable as cathode

2004

I am working with HVDC and sometimes we are using the sea as return conductor. As sub-electrodes we have used electrodes for cathodic protection such as magnetite, graphite and high silicon iron. Sometimes embedded in coke (shore electrodes). My question is if I use platinezed titanium with a current density of 50-500A/m2 (with some ripple) can this electrode go as cathode or will the coating be destroyed.

Best Regards,

Sören Nyberg
- Ludvika, Sweden

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Sören, No you can use platinized titanium anode or you can also use iridium net. You can buy this anode in Sweden by Selemet selectron in Rättvik.

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
2004

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Soren,

You can use platinised titanium in the conditions you describe. It is a very robust and inert electrode.

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2004

Min. 7.5 micron thick platinum plated titanium rod is the best option for your application.

Vanajambika Jeyakumar
- Chennai, Tamil Nadu, India
2004

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Electroplated platinum on titanium is very highly tensile stressed in most production facilities. Stress leads to cracks. Cracks admit chloride to the titanium and then the Platinum is undercut and falls off.

Inspect your electroplated platinum under magnification before making anodic in salt water.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2004