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Impact of Additives on Zirconium Oxidation by Water: Mechanistic insights from first principles

Mikaela Lindgren (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Itai Panas (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
RSC Advances (2046-2069). Vol. 3 (2013), 44, p. 21613-21619.
[Artikel, refereegranskad vetenskaplig]

Zirconium alloys are widely used as cladding materials employed to contain the fission fuel in nuclear power plants. A limiting factor for fuel longevity is the corrosion property of the zirconium alloys. In the reactor, the main corrodent is water. The oxide forms thermodynamically during hydrogen evolution. Due to the corrosion mechanism, a fraction of the hydrogen is transferred to the alloy. It has long been known that the alloying elements actually control the hydrogen pick-up fraction, HPUF. A mechanism that explains these observations by means of density functional theory calculations is presented and validated. A hydroxylated grain boundary model decorated by various transition metal, TM, ions is employed to study the dependence of the hydrogen evolution reaction, HER, on the choice of TM ion and spin state along the hydride-proton recombination pathway. The efficiency of the system to utilize the overpotential for hydrogen evolution, originating from the overall corrosivity of the alloy, is found to be decisive for the HPUF. A dual origin of the detrimental effects of Co and Ni additives on the HPUF is identified.



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Denna post skapades 2013-09-12. Senast ändrad 2016-03-22.
CPL Pubid: 183151

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Ytor och mellanytor
Elektronstruktur
Materialkemi
Kvantkemi
Katalys
Korrosionsteknik
Nanoteknik

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