Journal Archive

Platinum Metals Rev., 1958, 2, (4), 127

Platinum-coated Titanium Anodes

Possibilities in Industrial Electrolysis

The important discovery that a thin layer of platinum applied to the surface of titanium provides an economic non-consumable electrode was reported by J. B. Cotton of ICI Metals Division in Platinum Metals Review in April. The titanium acts as a bulk carrier of current, while the platinum provides an escape path for the current to enter the solution; small corrosion currents are quickly stifled as polarisation ensues. The platinum coating need not be impervious or continuous, and the electrodes will carry high anodic current densities in many types of solutions.

Commenting further on this development in the June issue of The Industrial Chemist, R. J. Watkins, also of ICI Metals Division, draws attention to the advantages of platinum-faced titanium anodes by comparison with carbon anodes in terms of much higher current density limits in many types of electrolytes and of the lightness and better mechanical properties of titanium.

Trials are already taking place with these new anodes for cathodic protection of ships and other marine structures by impressed current techniques, but a further most promising development lies in their use in industrial electrolytic cells for the manufacture of chemicals. In addition investigations are in hand on the possibility of employing them for electro plating, electro-descaling and electro-reduction.

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