The stress corrosion cracking performance of pure zirconium and zirconium alloys in highly oxidizing nitric acid

Nagano, Hiroo; Kajimura, Haruhiko

doi:10.1016/0010-938x(95)00166-h

Cited by 23 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The susceptibility of zirconium to SCC in HNO 3 evaluated by the critical potential for SCC coincides with the transition potential from the passive to transpassive potential region [10]. Also film weakening or roughening was observed on zirconium surfaces at potentials above the critical potential [10]. Hence polarization behaviour and surface characteristics of passive films formed at transition potentials are useful in understanding the susceptibility of zirconium alloys to SCC in nitric acid medium.…”

Section: Introductionmentioning

confidence: 88%

“…Ti-5Ta and Ti-5Ta-1.8Nb alloy has shown good passivation with wide passive range whereas the polarization curve for zircaloy-4 exhibited transition potential/breakdown of passivity. The susceptibility of zirconium to SCC in nitric acid occurs above the transition potential from passivity to transpassivity [10]. Thus anodic polarization curve with higher transition potential from passivity to transpassivity shows a higher SCC resistance.…”

Section: Potentiodynamic Anodic Polarisationmentioning

confidence: 98%

“…The only concern with the use of zirconium for reprocessing plant applications is its susceptibility to corrosion fatigue and stress corrosion cracking (SCC) reported in highly concentrated nitric acid medium [7][8][9]. The susceptibility of zirconium to SCC in HNO 3 evaluated by the critical potential for SCC coincides with the transition potential from the passive to transpassive potential region [10]. Also film weakening or roughening was observed on zirconium surfaces at potentials above the critical potential [10].…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Electrochemical and surface studies on zircaloy-4 exposed to concentrated nitric acid medium

Shankar

Mudali

2009

Trans Indian Inst Met

View full text Add to dashboard Cite

Zircaloy-4 has been considered as a candidate material for dissolver and evaporators in nuclear fuel reprocessing plants involving nitric acid of high concentrations at high temperatures. The present work deals with the electrochemical studies and surface analysis of passive films on zircaloy-4 and its welds in 11.5 M nitric acid medium. Potentiodynamic polarization technique was employed to study the corrosion behaviour of the alloy in both base and welded (Manual TIG and electron beam (EB) welding) conditions. The polarization curves for zircaloy-4 and its welds exhibited a distinct breakdown of passivity at 1.5 V (SCE) and repassivation, after showing a region of stable passivation. The characterization of passive films by SEM, XRD and LRS, grown at different potentials in 11.5 M nitric acid are presented. The surface morphology and phase analysis of passive films grown at higher potentials showed the presence of monoclinic ZrO 2 . The phases present in the passive film grown electrochemically in 11.5 M nitric acid at 2.0 V and by autoclaving are found to be similar. The presence of characteristic 1040 cm -1 Raman peak from the sample passivated at 1.2 V indicate that the oxide present consist of nanometer size grains of monoclinic zirconia.

show abstract

Section: Introductionmentioning

confidence: 88%

Section: Potentiodynamic Anodic Polarisationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Electrochemical and surface studies on zircaloy-4 exposed to concentrated nitric acid medium

Shankar

Mudali

2009

Trans Indian Inst Met

View full text Add to dashboard Cite

show abstract

“…7,9,11) The general corrosion resistance of zirconium is superior to that of Ti-5Ta alloy and niobium on immersion tests. The chemical stability of passive film of zirconium is given in the polarization curve of Fig.…”

Section: Relation Between Scc and Corrosion Fatiguementioning

confidence: 99%

“…1,2) Ti-5Ta alloy and niobium have little susceptibility to stress corrosion cracking (SCC) in boiling nitric acid solution, 3,4) however zirconium has the SCC susceptibility. [4][5][6][7][8][9][10][11] Recently, zirconium and Ti-5Ta alloy have been applied to the equipment of nuclear spent fuel reprocessing plants, 12,13) where a large amount of nitric acid is used. And so the fatigue behavior should be evaluated for the reliability of spent fuel reprocessing plant components made of these materials by considering the cyclic stress due to the practical operation.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Fatigue of Refractory Materials in Boiling Nitric Acid

Motooka

Kiuchi

2002

Mater. Trans.

View full text Add to dashboard Cite

Refractory materials such as zirconium, niobium and titanium alloys with excellent corrosion resistance in boiling nitric acid have been selected for use as structural materials of spent fuel reprocessing equipment. In this study, the fatigue crack growth rates of these materials were investigated by load control tests as a function of the stress intensity factor range in boiling 3 kmol/m 3 nitric acid and in air at room temperature. The fracture surfaces were observed by scanning electron microscopy. The fatigue crack growth rates of zirconium and niobium were enhanced in boiling nitric acid compared with those in air at room temperature. Acceleration effect due to corrosion fatigue was not observed in the crack growth of Ti-5Ta alloy. The fracture surfaces of Ti-5Ta alloy showed the ductile striation in both environments. On the other hand, the fracture surfaces of niobium represented the fatigue striation in air and the brittle striation due to corrosion in nitric acid. The fracture surfaces of zirconium in nitric acid showed brittle fracture and the ductile fracture related to stress corrosion cracking.

show abstract

ChemInform Abstract: Stress Corrosion Cracking Performance of Pure Zirconium and Zirconium Alloys in Highly Oxidizing Nitric Acid.

Nagano¹,

Kajimura²

1996

ChemInform

View full text Add to dashboard Cite

show abstract

The stress corrosion cracking performance of pure zirconium and zirconium alloys in highly oxidizing nitric acid

Cited by 23 publications

References 10 publications

Electrochemical and surface studies on zircaloy-4 exposed to concentrated nitric acid medium

Electrochemical and surface studies on zircaloy-4 exposed to concentrated nitric acid medium

Corrosion Fatigue of Refractory Materials in Boiling Nitric Acid

ChemInform Abstract: Stress Corrosion Cracking Performance of Pure Zirconium and Zirconium Alloys in Highly Oxidizing Nitric Acid.

Contact Info

Product

Resources

About