Impact of Additives on Zirconium Oxidation by Water: Mechanistic insights from first principles
Artikel i vetenskaplig tidskrift, 2013

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.

Författare

Mikaela Lindgren

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Itai Panas

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

RSC Advances

2046-2069 (ISSN)

Vol. 3 44 21613-21619

Styrkeområden

Nanovetenskap och nanoteknik

Energi

Materialvetenskap

Ämneskategorier

Kemiska processer

Materialkemi

Teoretisk kemi

Nanoteknik

Korrosionsteknik

Den kondenserade materiens fysik

DOI

10.1039/C3RA42941E