Oxidation characteristics of basal () plane and prism () plane in HCP Zr

Kim, Hyun Gil; Kim, To Hoon; Jeong, Yong Hwan

doi:10.1016/s0022-3115(02)01226-6

Cited by 63 publications

(21 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For many metals and alloys, the corrosion rate has been found to exhibit strong dependence on crystallographic orientation [1][2][3][4][5]. Assessing anisotropic corrosion properties by using single crystal samples limits the number of facets tested [3,4,6,7].…”

Section: Corrosion Dependence On Crystallographic Orientation For Varmentioning

confidence: 99%

“…Moreover, significant differences in findings as well as interpretation of crystal orientation effects on corrosion often occur [1][2][3][4][5][6][7][8][9][10][11][12][13]. For body-centered cubic (bcc) stainless steel in 0.6 M NaCl, the highest percentage of pitting events was observed on planes oriented ~25° away from {001} [8] while in contrast the {100} orientation was reported to have the highest corrosion rate in H 2 SO 4 [2] and NO 3 - [9].…”

Section: Corrosion Dependence On Crystallographic Orientation For Varmentioning

confidence: 99%

“…The EIS determined oxide thickness has been achieved for other material systems, such as Ni-Cr-Mo [44], Al [45,46] and the hcp Zr [5] but further analysis in the Mg system is needed. The circuit diagram for accurate EIS determination in Mg has been recently suggested in other work respective to the oxide growth ( Figure 2) [43].…”

Section: Opportunity To Ascertain Crystallographic Dependence Of Simumentioning

confidence: 99%

See 2 more Smart Citations

Effect of Crystallographic Orientation on the Corrosion of Magnesium: Comparison of Film Forming and Bare Crystal Facets using Electrochemical Impedance and Raman Spectroscopy

Bland

Gusieva

Scully

2017

Electrochimica Acta

120

View full text Add to dashboard Cite

The corrosion rate of Mg indicates a strong crystallographic dependence in chloride-containing, alkaline environments that correlates inversely with oxide film thickness. In contrast, a different crystallographic orientation dependency is observed initially during open circuit corrosion in non-chloride containing, near neutral pH buffered, chelating environments such as Tris(hydroxymethyl)aminomethane (TRIS) and Ethylenediaminetetraacetic (EDTA) which minimize air-formed MgO oxides. The origins of the differences in the rates of the coupled corrosion processes as a function of crystallographic orientation were investigated utilizing electrochemical impedance spectroscopy (EIS) and Raman vibrational spectroscopy. High frequency constant phase elements (CPEs) were exploited to determine oxide thicknesses as a function of crystal orientation. In unbuffered NaCl, open circuit corrosion was faster on basal planes while lower corrosion rates were observed on low index, prismatic and pyramidal planes. This variation in rate with crystallographic orientation in 0.6 M NaCl was interpreted to depend on the MgO and Mg(OH) 2 film thicknesses as a function of orientation. In particular, crystal planes with a lower MgO/Mg(OH) 2 thickness corroded at higher rates as assessed in-situ by EIS and suggested by Raman spectroscopy. The crystallographic orientation dependence of corrosion seen initially upon exposure in the buffered neutral pH environments corresponded with crystal facet surface energy for bare Mg but this trend disappeared with exposure time and Mg(OH) 2 films were then detected.

show abstract

Section: Corrosion Dependence On Crystallographic Orientation For Varmentioning

confidence: 99%

Section: Corrosion Dependence On Crystallographic Orientation For Varmentioning

confidence: 99%

Section: Opportunity To Ascertain Crystallographic Dependence Of Simumentioning

confidence: 99%

See 1 more Smart Citation

Effect of Crystallographic Orientation on the Corrosion of Magnesium: Comparison of Film Forming and Bare Crystal Facets using Electrochemical Impedance and Raman Spectroscopy

Bland

Gusieva

Scully

2017

Electrochimica Acta

120

View full text Add to dashboard Cite

show abstract

“…It is not clear yet what role the suboxide region has on the oxide growth process. Also recent studies have indicated a role of oxide-metal epitaxy in the oxide structure [40], while others have shown little epitaxy [26]. The role of epitaxy needs to be investigated further.…”

Section: At the Beginning Of The Oxidation Small Oxide Grains Nucleamentioning

confidence: 97%

Microstructure and Growth Mechanism of Oxide Layers Formed on Zr Alloys Studied with Micro-Beam Synchrotron Radiation

Motta

Yilmazbayhan

Comstock

et al. 2005

Zirconium in the Nuclear Industry: Fourteenth International Symposium

View full text Add to dashboard Cite

The structures of oxides formed in water and lithiated water on three Zr-based alloys with varied corrosion behavior were studied with micro-beam synchrotron radiation and optical microscopy. Micro-beam synchrotron radiation (0.2 µm spot) has a unique combination of high elemental sensitivity (ppm level) and fine spatial resolution that allowed the determination of various oxide characteristics such as phase content, texture, grain size, and composition as a function of distance from the oxide-metal interface. Micro-beam X-ray fluorescence shows that the oxides formed in lithiated water have increased levels of Fe absorbed from the autoclave environment indicating greater oxide porosity in these oxides. The phase content, texture, and grain size of oxides were studied in detail using synchrotron radiation micro-beam diffraction for samples corroded in water and lithiated water. A remarkable periodicity was observed in the oxide structures using various techniques including X-ray peak intensities for both monoclinic and tetragonal zirconia, texture, and optical microscopy. The periods were similar to the transition period and were less visible in the oxides that behaved worse in lithiated water. These results are discussed in terms of models of oxide growth and of the differences between alloys.

show abstract

“…A number of studies have investigated the oxidation behavior of HCP Zr and its alloys, and suggest improvements. [4,7,8,9,10,11] Experimental as well as theoret- 25 ical studies have shown that the Zr basal (0001) surface has lower energy and higher oxidation resistance than the prismatic (1010) surface [12,13,14,15], suggesting that a textured Zr surface should improve resistance to oxidation. Nie and Xiao used first principle calculations to study the adsorption of water molecule on a metal-doped Zr surface [16] and found that certain elements in the 4th and 5th period of the peri-30 odic table could enhance the oxidation resistance of zircaloys by repelling the water molecules.…”

Section: Introductionmentioning

confidence: 99%

First principles calculations of beryllium stability in zirconium surfaces

Jain

Trinkle

2017

Acta Materialia

View full text Add to dashboard Cite

High-temperature oxidation of zircaloys poses a serious safety risk for nuclear fuel cladding applications, thus driving the search for oxidation resistant alloys. Ellingham diagrams suggest preferential oxidation of beryllium over zirconium, but the atomicscale behavior of Be near Zr surfaces is unknown. We perform first principle calculations using density functional theory to investigate the stability of Be at possible sites in the Zr surfaces and bulk. Our calculations predict that Be favors substitutional sites and prefers to segregate to the surface layers. Charge density analysis shows charge redistribution around the solute atom in substitutional sites which leads to increased bonding and explains the high stability of these sites. The calculated surface segregation energy suggests that Be migrates towards the surface at high temperatures, which could enhance oxidation resistance.

show abstract

Oxidation characteristics of basal () plane and prism () plane in HCP Zr

Cited by 63 publications

References 16 publications

Effect of Crystallographic Orientation on the Corrosion of Magnesium: Comparison of Film Forming and Bare Crystal Facets using Electrochemical Impedance and Raman Spectroscopy

Effect of Crystallographic Orientation on the Corrosion of Magnesium: Comparison of Film Forming and Bare Crystal Facets using Electrochemical Impedance and Raman Spectroscopy

Microstructure and Growth Mechanism of Oxide Layers Formed on Zr Alloys Studied with Micro-Beam Synchrotron Radiation

First principles calculations of beryllium stability in zirconium surfaces

Contact Info

Product

Resources

About