, Volume 36, Issue 3, pp 231-235

Corrosion behavior of dimensionally stable anodes in chlorine electrolyses

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Abstract

The rate of anodic dissolution of ruthenium from the active coating of dimensionally stable anodes is studied as a function of time by a radiotrace technique in chloride and perchlorate solutions. In chloride solutions, the rate decreases by approximately four orders of magnitude and for a long (hundreds of hours) time. In the perchlorate solution, the dissolution rate changes only by hundredfold, for 25 min. These data confirmed the earlier conclusion that adsorbed chlorine inhibits anodic dissolution of the noble metal. The pH influence on the anode’s steady-state corrosion rate is studied. The corrosion rate sharply increases of pH increasing from 2 to 4 then slowly decreases to the values characteristic of the process rates in solutions of pH 2.