PITTING CORROSION OF ZIRCONIUM IN AQUEOUS-SOLUTION

The open circuit potentials of the Zr electrode are followed as a function of time in various aqueous solutions till attainment of steady state values. These vary with the logarithm of the molar concentration as E(st) = a(1) +/- b(1) logc Plots of the Zr electrode potential as a function of the logarithm of immersion time are linear obeying the relation E = a(2) + b(2) logt The results are discussed on the basis of oxide film thickening and repair. Fitting corrosion of Zr was examined in chloride solutions using the potentiodynamic technique. The effect of some inogranic and organic additives was' also investigated for inhibiting the pitting corrosion of Zr, and the relative performance is presented and discussed.