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Localized oxidation of Zr alloys in nuclear reactor environments
Localized oxidation of Zr alloys in nuclear reactor environments
Zr-based alloys, owing to their low thermal neutron absorption cross-section, are used in fuel clad and core components of water cooled nuclear reactors. We studied the nodular corrosion susceptibility of Zr-based fuel cladding materials (Zircaloy-2, Zircaloy-4 and Zr-1Nb) and Zr-2.5Nb pressure tube material since localized enhanced corrosion has been observed in these alloys under different water chemistry conditions. The effect of dissolved oxygen level, exposure time and exposure type was assessed using single-step and two-step accelerated autoclave exposure tests. Based on results, we reported insights into the mechanism and prevalence of nodular corrosion in these alloys.
Publication: M Kiran Kumar, S Aggarwal, D Beniwal, AK Dey, H Singh, V Kain, Localized oxidation of zirconium alloys in high temperature and pressure oxidizing environments of nuclear reactors, Materials and Corrosion, 65 (2014) 244-249
Research carried out at: Corrosion Science Section, Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Corrosion of SS304L in nitric acid and effect of halide ions
Corrosion of SS304L in nitric acid and effect of halide ions
Austenitic stainless steels passivate easily in nitric acid and SS304 low-carbon nitric-acid grade is used as structural material in nuclear spent-fuel reprocessing plants for handling nitric acid process streams. In boiling/near-boiling nitric acid containing oxidizing ions (corrosion and fission products), inter-granular corrosion is observed even in non-sensitized conditions. We studied the corrosion behaviour of SS304L NAG under different nitric acid concentrations and different applied potentials in transpassive potential regime. We also observed the effect of chloride and fluoride ions which tend to promote pitting corrosion.
Publication: D Beniwal, M Kiran Kumar, V Kain, VS Raja, Corrosion Behaviour of Austenitic Stainless Steels in Nitric Acid Containing Single/Mixed Halides in Transpassive Regime, International Corrosion Prevention Symposium for Research Scholars (CORSYM-2014), Mumbai, India, February 2014. (Awarded as best poster presentation)
Research carried out at: (a) Corrosion Science Section, Materials Science Division, BARC, Trombay, Mumbai, India; and (b) Aqueous Corrosion Lab, IIT Bombay, Mumbai, India
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