Parameters to estimate the metal dusting attack in different gases

Schlereth, Clara; Hack, Klaus; Galetz, Mathias C.

doi:10.1016/j.corsci.2022.110483

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…Samples of 602 CA, 699 XA, 601 and 690 were exposed in gas 1. In a previous study using the same condition, [ 26 ] samples ground to P1200 grit showed pit formation starting in the first 240 h (602 CA), 240 h (601), and 480 h (690). 699 XA, also ground to P1200 grit, was not attacked in this gas even after 1507 h. This confirms the better performance of 699 XA in comparison with the attacked samples of 602 CA, 601, and 690, all ground to P1200 grit in Figure 2.…”

Section: Discussionmentioning

confidence: 95%

Influence of surface treatment on metal dusting resistance of welds

Schlereth,

White,

Lepple

et al. 2023

Materials & Corrosion

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Welds of the commercial Ni‐based alloys 602 CA, 699 XA, 601 and 690 were exposed under harsh metal dusting conditions. The pit formation was compared for as‐welded, brushed, ground, glass bead blasted, steel shot peened and dry cathodic pickled surfaces. Surface treatments were applied by industrial partners. When (stainless) steels were involved in the surface treatment, Fe contaminations acted as catalyst sites for pit initiation. A fast metal dusting attack was also observed on dry cathodic pickled samples. A beneficial effect was attributed to deformation of the sub‐surface zone, as it provides diffusion paths for oxide formers (by grinding and glass bead blasting). In the same region, formation of α‐Cr (BCC) precipitates was observed. The best performance was found for samples where the weld bead was fully flattened by grinding to P40 grit. In addition, it was demonstrated that on‐site slurry aluminization further enhances the resistance against metal dusting attack.

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Section: Discussionmentioning

confidence: 95%

Influence of surface treatment on metal dusting resistance of welds

Schlereth,

White,

Lepple

et al. 2023

Materials & Corrosion

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“…The thermodynamic stabilities of Fe-and Mn-oxides and carbides are shown in Fig. 6 In addition, the C-activity ac of the MD gas used in the conducted experiments and calculated after [14] and the oxygen partial pressure p(O2) of the MD gas are marked. Concerning the used conditions, MnO is stable in case of Mn alloying at 550 °C and Fe3O4 is stable in case of Fe alloying.…”

Section: Thermodynamic Stabilitiesmentioning

confidence: 99%

Decreased Metal Dusting Resistance of Ni-Cu Alloys by Fe and Mn Additions

Ulrich,

Kasatikov,

König

et al. 2024

Preprint

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Ni-Cu alloys are promising for application at temperatures between 400–900°C and reducing atmospheres with high C-contents. Typically, under such conditions, metallic materials in contact with the C-rich atmosphere are degraded by a mechanism called MD. Ni-Cu-alloys do not form protective oxide scales, but their resistance is attributed to Cu, which catalytically inhibits the C-deposition on the surface. Adding other alloying elements, such as Mn or Fe, was found to enhance the MD attack of Ni-Cu alloys again. In this study, the effect of the Mn and Fe is divided into two affected areas: the surface and the bulk. The MD attack on binary Ni-Cu alloys, model alloys with Fe and Mn additions, and commercial Monel Alloy 400 is experimentally demonstrated. The surface electronic structure causing the adsorption and dissociation of C-containing molecules is investigated for model alloys. Analytical methods such as scanning electron microscopy combined with energy-dispersive X-ray spectroscopy, electron probe microanalysis combined with wavelength-dispersive X-ray spectroscopy, X-ray diffraction analysis, and near-edge X-ray absorption fine structure measurements were used. The results are correlated to CALPHAD calculations and atomistic simulations combining density functional theory calculations and machine learning. It is found that the Cu content plays a significant role in the surface reaction. The effect of Mn and Fe is mainly attributed to oxide formation. A mechanism explaining the enhanced attack by adding both Fe and Mn is proposed.

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“…In this research, the concept of carbon erosion (CE) of bulk metal precursors is utilized. This concept is based on the phenomenon of metal dusting under the action of a reactive medium [51][52][53]. Recently, the approach was reported to be a promising technique for the synthesis of composite materials [54,55].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ni-Cu-CNF Composite Materials via Carbon Erosion of Ni-Cu Bulk Alloys Prepared by Mechanochemical Alloying

et al. 2023

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The unique physical and chemical properties of composite materials based on carbon nanofibers (CNFs) makes them attractive to scientists and manufacturers. One promising method to produce CNFs is catalytic chemical vapor deposition (CCVD). In the present work, a method based on carbon erosion (CE) of bulk microdispersed Ni-Cu alloys has been proposed to prepare efficient catalysts for the synthesis of CNF-based composites. The initial Ni-Cu alloys were obtained by mechanochemical alloying (MCA) of metallic powders in a planetary mill. The effect of MCA duration on the phase composition of Ni-Cu samples was studied by X-ray diffraction analysis and temperature-programmed reduction in hydrogen. It has been also revealed that, during such stages as heating, reduction, and short-term exposure to the reaction mixture (C2H4/H2/Ar) at 550 °C, the formation of a Ni-based solid solution from the initial Ni-Cu alloys takes place. The early stages of the CE process were monitored by transmission electron microscopy combined with energy-dispersive X-Ray analysis. It was found that the composition of the catalytic particles is identical to that of the initial alloy. The morphological and structural features of the prepared Ni-Cu-CNF composites were studied by scanning and transmission electron microscopies. The textural characteristics of the composites were found to be dependent on the reaction time.

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Parameters to estimate the metal dusting attack in different gases

Cited by 8 publications

References 42 publications

Influence of surface treatment on metal dusting resistance of welds

Influence of surface treatment on metal dusting resistance of welds

Decreased Metal Dusting Resistance of Ni-Cu Alloys by Fe and Mn Additions

Synthesis of Ni-Cu-CNF Composite Materials via Carbon Erosion of Ni-Cu Bulk Alloys Prepared by Mechanochemical Alloying

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