Nodular corrosion of zirconium alloys in gaseous environment containing different contaminants

•Nodules formed on Zr-2.5Nb and Zr-2.5Nb-0.5Cu in CO2+2%O2 mixture with contaminants•Ethylene present in the gas mixture led to nodular corrosion only with radiation•Presence of HNO3, Cl2, HCOOH and cold moisture led to nodules without radiation•The severity and extent of nodular corrosion varied am...

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Bibliographic Details
Published in:Journal of nuclear materials 2021-03, Vol.545, p.152640, Article 152640
Main Authors: Nouduru, Sai Karthik, Mandapaka, Kiran K., Roychowdhury, S., Gumma, Saradhi, Sharma, Rishi, Verma, Rajesh, Kain, Vivekanand
Format: Article
Language:English
Subjects:
Acids
Alloys
Carbon dioxide
Chlorine
CO2
Contaminant
Contaminants
Corrosion
Corrosion environments
Corrosion mechanisms
Ethylene
Formic acid
Gaseous oxidation
Localized film damage
Nitric acid
Nodular corrosion
Nodules
Radiation
Sulfuric acid
Zirconium
Zirconium alloys
Zirconium base alloys
Zr-2.5Nb
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Summary:•Nodules formed on Zr-2.5Nb and Zr-2.5Nb-0.5Cu in CO2+2%O2 mixture with contaminants•Ethylene present in the gas mixture led to nodular corrosion only with radiation•Presence of HNO3, Cl2, HCOOH and cold moisture led to nodules without radiation•The severity and extent of nodular corrosion varied among contaminants•Nodular corrosion with all contaminants explained by the global mechanism in gas The nodular corrosion susceptibility of two zirconium alloys, namely Zr-2.5Nb and Zr-2.5Nb-0.5Cu, in CO2 + O2 containing different contaminants is established. The contaminants used were ethylene, chlorine, formic acid, nitric acid, sulphuric acid and moisture. Nodules formed on both alloys in presence of each contaminant with varied extent except for sulphuric acid. The presence of ethylene resulted in nodular corrosion only in presence of radiation. The occurrence and extent of nodular corrosion is discussed in light of the “global mechanism” for nodular corrosion of zirconium alloys in gaseous environments. [Display omitted]
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2020.152640