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The behavior of Ti‐supported Pt‐Ir alloys in the electrolysis of normalNaCl has been examined as a function of Ir content, normalNaCl concentration, and electrolysis time. Short‐time experiments show that an iridium content as low as 0.5% is sufficient to eliminate almost completely the passivation effects (in 1M and saturated normalNaCl solution). Long‐run experiments make clear that the minimum percentage of 5/10% Ir is necessary in order to have low potentials after thousands of hours; in such a case, however, complicating factors such as mechanical stability and chemical corrosion should be taken into account.

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