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Corrosion of Zirconium Alloys in Nuclear Applications – A Review

With the recent demands for higher fuel discharge burn up towards better fuel utilisation and higher heat ratings and coolant temperatures for better thermal efficiency, interest on corrosion of zirconium alloys has been rekindled even though a large amount of work has been carried out to understand various aspects of corrosion of zirconium and its alloys in relation to their behaviour under nuclear operating conditions in the last 40 years or so. Though it seems that there exists some scope for further development of these alloys, which may need better understanding of the various corrosion mechanisms/micromechanisms, in the present paper an attempt has been made to highlight a few corrosion aspects related to zirconium, however mainly zircaloys. Investigations carried out in this laboratory as well as elsewhere have been discussed keeping in view the aim of advancing the present knowledge so as to be able to meet the future requirements in terms of corrosion resistance as expected from this alloy system.