Characterization of initial intergranular oxidation processes in alloy 600 at a sub-nanometer scale

Persaud, S.Y.; Langelier, Brian; Korinek, Andreas; Ramamurthy, S.; Botton, Gianluigi A.; Newman, R. C.

doi:10.1016/j.corsci.2018.01.020

Cited by 31 publications

(27 citation statements)

References 40 publications

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“…10d reveals that the intergranular oxidation propagates along the Ni-rich zone-matrix interface but not through the Ni-rich zone. Similar results have also been reported in the literature and the Ni-rich zone observed ahead of the tip has been proved to be GB migration (GBM) [13,14,19,20,23,42,44,45].…”

Section: Oxidation Around Igscc Crack Tipsupporting

confidence: 90%

Section: Comparison Between Surface and Crack Tip Oxidationsupporting

confidence: 72%

“…IOZ has been observed by many researchers and is reported to be associated with the formation of a Ni-rich region [13,14,19,20,23,42,44,45,65]. The Ni-rich region is also observed in front of the crack tips examined in this work, which is believed to be associated with the GBM [13,14,19,20,23,42,44,45,65]. Since the Nirich region is depleted in Cr and Fe, the formation of GBM is believed to be due to outward diffusion of Cr and Fe, which is referred to as diffusion induced GBM (DIGM) in the literature [13,19,20,23,42,44,45,65].…”

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 88%

“…Since the signal intensity of Ni in the Ni-rich zone is greater than the unaffected matrix, it suggests that Ni expulsion has occurred in this region. The formation of this Ni-rich zone has been reported to be due to grain boundary migration [13,19,20,24].…”

Section: Intragranular Oxidationmentioning

confidence: 96%

“…Thereafter, despite the fact that a large number of laboratory studies have been performed and several possible models proposed to explain the IGSCC phenomenon [2][3][4][5][6], the exact failure mechanisms driving IGSCC propagation remain unclear. To date, plenty of parameters have been reported to have influence on SCC, including temperature, alloy composition, cold-work, electrochemical potential, and stress [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The problem is further convoluted as the parameters listed above are not independent.…”

Section: Introductionmentioning

confidence: 99%

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A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Chen

Shen

2020

Corrosion Science

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Surface, stagnant grain boundary (GB), and crack tip oxidation of Alloy 600 were studied. The mirror-finished surface oxide has a duplex structure and the formation mechanisms of each layer are discussed. A more compact oxide film is observed on the cold-worked surface, while the nano-GBs are preferentially oxidized. The crack tip oxidation rate is around four orders of magnitude faster than that of the stagnant GB, and their oxidation mechanisms are believed to be the same. Diffusion-induced grain boundary migration (DIGM) is observed around the crack and oxidized GB tips. The role of Ni expulsion on the DIGM is discussed.

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Section: Oxidation Around Igscc Crack Tipsupporting

confidence: 90%

Section: Comparison Between Surface and Crack Tip Oxidationsupporting

confidence: 72%

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 88%

Section: Intragranular Oxidationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Chen

Shen

2020

Corrosion Science

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Combining AFM imaging and elementally resolved spectroelectrochemistry for understanding stability and quality of passive films formed on Alloy 600

Dworschak

Bishara

Cheng

et al. 2022

Materials & Corrosion

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Understanding elemental corrosion currents and visualizing corroding topographies provides a detailed insight into corrosion mechanisms at the nanoscale. Here, we develop a strategy to understand the elemental composition, corrosion resistivity, and local stability of passive materials. Specifically, we utilize a pulse voltammetry approach in a novel electrochemical atomic force microscopy (AFM) cell and complement this data by real-time dissolution currents based on spectroelectrochemical online analysis in an inductively coupled plasma mass spectroscopy (ICP-MS) flow cell. We study the oxide properties and their protective behavior when formed under different applied potentials using Alloy 600 as a model sample. Both AFM and ICP-MS data show that passive films formed on Alloy 600 at around +0.3 to +0.4 V in neutral 1 mM NaCl solution are most stable during anodic corrosion at +1.0 V, while AFM further demonstrates that local dissolution occurs, indicating locally varying defect levels in the passive film. In combination with both techniques, our approach provides real-time elementally resolved and localized information of passive film quality under corrosive conditions, and it may prove useful for other corroding materials.

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Advanced Characterization of Oxidation Processes and Grain Boundary Migration in Ni Alloys Exposed to 480 °C Hydrogenated Steam

Persaud

Langelier

Eskandari

et al. 2017

The Minerals, Metals &Amp; Materials Series

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Characterization of initial intergranular oxidation processes in alloy 600 at a sub-nanometer scale

Cited by 31 publications

References 40 publications

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Combining AFM imaging and elementally resolved spectroelectrochemistry for understanding stability and quality of passive films formed on Alloy 600

Advanced Characterization of Oxidation Processes and Grain Boundary Migration in Ni Alloys Exposed to 480 °C Hydrogenated Steam

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