1/4/2023 0 Comments Pourbaix diagram of zinc pdf![]() ![]() The increased availability of zinc depleted in Zn-64 on the world market has raised the interest for zinc-injection in nuclear power plants. The latter is a y-radiator which increases the radiation level in nuclear plants. IGSCC (Inter Granular Stress Cracking Corrosion) has also been reported to decrease by zinc injection into the cooling media in LWRs (Light Water Reactors).839 However, zinc injection has a drawback as Zn-64, which has a natural abundance of 48.6%) transforms during irradiation to Zn-65. Zinc injection into the cooling media has a positive effect on reducing the build-up of radionuclides, especially Co-60, in the passive layers of the construction materials of nuclear reactors.le7 Co-60 is a strong y-radiator with a long half life (T1’2= 5.272 y) and causes health problems for maintenance personnel. INTRODUCTION The increasing interest in zinc in the nuclear power industry is due to several reasons. However, at concentrations z lO_‘.’ M zinc passivates by formation of ZnO, which is stable in the temperature interval investigated. The calculations show that the hydroxide of zinc does not passivate at the concentration of 10K6M, due to the uncharged zinc(I1) complex, Zn(OH)z(aq). Extrapolation of thermochemical data to elevated temperatures has been performed with the revised model of Helgeson-Kirkham-Flowers, which also allows uncharged aqueous complexes, such as Zn(OH)z(aq), to be handled. The diagrams were calculated for three concentrations, 10V5, 10K6 and lOpa molal, the latter for use in high purity water such as in nuclear power reactors. T Studsvik Material AB, S-61 1 82 Nykoping, Sweden $ Studsvik Eco and Safety AB, S-61 1 82 Nykoping, Sweden Abstract-Pourbaix diagrams (potential/pH diagrams) for zinc at 25300☌ have been revised. 107-l 14, 1997 CopyriElsevier Science Ltd Printed in Great Britain. ![]()
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