Corrosion crack enhancement during the cathodic activation of zirconium AB2 alloys

Zerbino, J. O.; Visintín, Arnaldo; Triaca, Walter Enrique

doi:10.1007/s10008-007-0331-3

Cited by 4 publications

(4 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zirconium and its alloys are widely used in the nuclear industry as fuel cladding agent and in the chemical industry and in the biomedical implants as an alloying component (1)(2)(3)(4). The wide acceptance of this metal and alloy is due to its superior mechanical strength and resistance towards corrosion and H2 embrittlement (6)(7).…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Analysis of Zr Dissolution in Acidic Fluoride Media Using Electrochemical Impedance Spectroscopy

2017

View full text Add to dashboard Cite

The mechanism of dissolution of Zr in 10 mM HF was investigated using potentiodynamic polarization and electrochemical impedance spectra acquired at various dc potentials. The surface morphological changes in the active and passive regions were studied using atomic force microscopy. The EIS spectra acquired at various dc potentials were modeled using electrical equivalent circuit fitting. A four step mechanism which consists two intermediates and a chemical and electrochemical dissolution steps was used to explain the polarization and EIS results. The model predicts the active-passive transitions in the polarization curve and qualitatively matches the patterns of EIS spectra observed in active and passive regions. The changes of the surface coverage and the dissolution rates with over potential were estimated.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanistic Analysis of Zr Dissolution in Acidic Fluoride Media Using Electrochemical Impedance Spectroscopy

2017

View full text Add to dashboard Cite

show abstract

“…Ti is used in aerospace industry, biomedical implantations, and in several chemical industries due to its low density, high mechanical strength and corrosion resistance (1,(3)(4)(5)(6)(7). Zr is mainly used as a fuel cladding material in nuclear industries and in chemical industries due to its high resistance to corrosion and hydrogen embrittlement (8)(9)(10). Although these materials exhibit high corrosion resistance in harsh acidic and alkaline environment, they readily dissolve in acidic fluoride media.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Corrosion Behavior of Ti and Zr in HF Media

Amrutha

Ramanathan

2017

ECS Trans.

View full text Add to dashboard Cite

The corrosion behavior of Ti and Zr in varying concentrations of acidic fluoride media was studied. Corrosion current was estimated using Tafel extrapolation of potentiodynamic polarization data and polarization resistance was estimated using potentiodynamic polarization, linear polarization and electrochemical impedance spectroscopic data. The effect of various species formed due to the HF dissociation to the corrosion current was estimated using linear regression analysis.-2 HF and HF are the species which impact the corrosion of Ti and Zr. The results show that in pure HF solutions, Ti offers better corrosion resistance than Zr.

show abstract

“…[1][2][3][4] The wide acceptance of this metal and its alloys is due to their superior mechanical strength, and high resistance toward corrosion, and H 2 embrittlement. [5][6][7][8] These properties are due to the formation of a stable, protective passive film of ZrO 2 .…”

mentioning

confidence: 99%

“…Zirconium and alloys containing Zr are extensively used in the nuclear power industry as fuel cladding agents, in chemical industries as an alloying component, and in biomedical implants. [1][2][3][4] The wide acceptance of this metal and its alloys is due to their superior mechanical strength, and high resistance toward corrosion, and H 2 embrittlement. [5][6][7][8] These properties are due to the formation of a stable, protective passive film of ZrO 2 .…”

mentioning

confidence: 99%

Mechanistic Analysis of Anodic Dissolution of Zr in Acidic Fluoride Media

Amrutha

Rao

Ramanathan

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Anodic dissolution of Zr in 10 mM HF was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. The surface state of the electrode was analyzed using X-ray photon spectroscopy, and the surface morphology was characterized using atomic force microscopy. EIS data acquired at multiple dc potentials were subjected to mechanistic analysis. Reaction mechanism analysis approach reveals that at least four intermediates are required to describe the observed results. The intermediates are likely to be Zr sub-oxides, oxyfluorides and ZrO 2 . The proposed mechanism successfully predicts the major features observed in polarization and impedance spectra. At low overpotentials, the fractional surface coverage of Zr 3+ species is higher than that of Zr 4+ species, and the electrochemical dissolution rate is higher than the chemical dissolution rate. As the overpotential increases, the surface is covered with Zr 4+ species and chemical dissolution rate becomes comparable to electrochemical dissolution rate. Although the surface is covered with Zr 4+ species at higher overpotentials, significant chemical and electrochemical dissolution processes continue to occur and hence Zr is not protected in acidic fluoride media under anodic conditions. © The Author Zirconium and alloys containing Zr are extensively used in the nuclear power industry as fuel cladding agents, in chemical industries as an alloying component, and in biomedical implants.1-4 The wide acceptance of this metal and its alloys is due to their superior mechanical strength, and high resistance toward corrosion, and H 2 embrittlement.5-8 These properties are due to the formation of a stable, protective passive film of ZrO 2 .9-11 Although Zr exhibits excellent corrosion resistance in most of the harsh environments, it readily dissolves in acidic fluoride media. 6,7,12,13 Earlier scientific reports on Zr dissolution are mostly based on conventional techniques, such as weight loss measurements, 14 measurement of volume of H 2 gas evolved, 7 and steady-state polarization techniques.15 Prono et al. 16 have analyzed the polarization of Zr in 0.12 M NaF + 7 M HNO 3 and proposed a seven-step mechanism comprising three competitive paths to describe the dissolution. This analysis was limited to the modeling of polarization data obtained at a single concentration. In our previous work, Zr anodic dissolution mechanism in the acidic fluoride medium was studied using the mechanistic analysis of current potential polarization data in various HF solutions.17 A mechanism containing two adsorbed intermediates and two dissolution steps, shown in Eq. 1, was proposed. The model successfully predicted the major characteristics of the polarization curves, and the results predicted that the chemical and the electrochemical dissolution steps were affected by the concentration of HF − 2 and HF, respectively. Anodic dissolution of other valve metals such as Ti 18,19 and Nb 20 have been characterized using potentiodynamic polarization and electrochemical imped...

show abstract

Corrosion crack enhancement during the cathodic activation of zirconium AB2 alloys

Cited by 4 publications

References 55 publications

Mechanistic Analysis of Zr Dissolution in Acidic Fluoride Media Using Electrochemical Impedance Spectroscopy

Mechanistic Analysis of Zr Dissolution in Acidic Fluoride Media Using Electrochemical Impedance Spectroscopy

Comparison of Corrosion Behavior of Ti and Zr in HF Media

Mechanistic Analysis of Anodic Dissolution of Zr in Acidic Fluoride Media

Contact Info

Product

Resources

About