A novel ultrafine-grained Ni3Al with increased cyclic oxidation resistance

Xiao, Peng; Li, M.; Wang, F.

doi:10.1016/j.corsci.2011.01.043

Cited by 41 publications

(5 citation statements)

References 39 publications

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“…After oxidation for 25 h, the results of EDS in Table 1 show that the island‐like oxide region is rich in Al and O elements and the atomic ratio of Al and O is about 2 : 3, and according to the result of XRD analysis at 800 °C, it can be concluded that the island‐like oxides are mainly Al 2 O 3 . From the enlarged view in the upper right corner of Figure 3e, it can be seen that whisker‐like Al 2 O 3 crystals appear in the island‐like oxides, and it is a typical shape of θ‐Al 2 O 3 which is often observed in the initial stage of oxidation of NiAl based alloys or coatings [9,12–15] . The metastable θ‐Al 2 O 3 is generally transformed to steady‐state α‐Al 2 O 3 in the late stage of oxidation [16] .…”

Section: Resultsmentioning

confidence: 94%

“…From the enlarged view in the upper right corner of Figure 3e, it can be seen that whisker-like Al 2 O 3 crystals appear in the island-like oxides, and it is a typical shape of θ-Al 2 O 3 which is often observed in the initial stage of oxidation of NiAl based alloys or coatings. [9,[12][13][14][15] The metastable θ-Al 2 O 3 is generally transformed to steady-state α-Al 2 O 3 in the late stage of oxidation. [16] In addition, the number of pores in the islandlike oxides is greatly reduced.…”

Section: Microscopic Morphology and Composition Of Oxide Filmmentioning

confidence: 99%

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Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

Song

et al. 2022

ChemistrySelect

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The oxidation behavior and oxidation kinetics of NiCrAl alloy were studied by XRD, SEM and the thermogravimetric analysis method. The adhesion strength of the films was characterized by micron scratch tester. The results show that the oxide film has not formed at 600 °C and 700 °C, and an oxide layer of Al2O3 has formed at 800 °C. Moreover, an oxide layer composed of Cr2O3 and Al2O3 has formed at 900 °C. After oxidation at 800 °C for 100 h, partial θ‐Al2O3 has transformed to steady‐state α‐Al2O3 and a dense oxide film of Al2O3 with the thickness of about 620 nm has formed on the surface of the NiCrAl alloy. The oxidation kinetics curve of the alloy obeys the parabolic law and there are two oxidation rate constants in the oxidation process. The oxidation rate constant of 1.58×10−4 mg2⋅cm−4⋅h−1 in the early oxidation period (0∼12 h) and the oxidation rate constant of 1.04×10−4 mg2⋅cm−4⋅h−1 in the late oxidation period (12∼100 h) indicate that the oxidation resistance ability of the alloy increases with the extension of oxidation time. With the increase of the oxidation time, the interface bonding strength between the oxide film and the substrate can be improved and reaches 5.21 N at 800 °C for 100 h.

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Section: Resultsmentioning

confidence: 94%

Section: Microscopic Morphology and Composition Of Oxide Filmmentioning

confidence: 99%

Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

Song

et al. 2022

ChemistrySelect

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“…Electrodeposition of the pure Ni coatings was performed at 2 A/dm 2 current density from a Ni-sulphate bath containing 150 g/L NiSO 4 .6H 2 O, 5 g/L NH 4 Cl, 15 g/L H 3 BO 3 , 0.1 g/L C 12 H 25 Na-SO 4 ). The Ni-28wt.%Al composite coatings were fabricated at the same current density by introducing appropriate amount of 1 µm-size Al particles into the Ni-sulphate bath [9]. After each deposition, coatings were rinsed with distilled water, ultrasonically cleaned in acetone, and oven-dried at 105 o C for 2 h.…”

Section: Materials Preparationmentioning

confidence: 99%

“…In dry corrosion environments, electrodeposited Ni containing up to 28wt.% of Al particles exhibited greater oxidation resistance than pure Ni coating, because of the ability to enrich the NiO scale with a slowgrowing, thermodynamically stable and highly resistant Al 2 O 3 scale [8]. With subsequent vacuum annealing treatment, the Ni grains and Al particles in the NiAl composite can react to form γ-Ni 3 Al intermetallic compounds in a resultant ultra-fine grain alloy coating which exhibits greater oxidation resistance and better oxide scale formation mechanism, compared with a conventional coarse grain γ / -Ni 3 Al alloy [9]. Unfortunately, however, reports on the characterization of the electrochemical corrosion behaviour of Ni-Al composite coatings are still lacking in the literature, thus, limiting the application of the Ni-Al composite coatings in wet environments.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Electrochemical Corrosion Behaviour of a Ni–28wt.%Al Composite Coating in 3.5% NaCl Solution

Onyeachu¹,

Peng²,

Oguzie³

et al. 2015

Port. Electrochim. Acta

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The electrochemical corrosion behaviour of an electrodeposited Ni-28wt.%Al composite coating was characterized after 24 h and 72 h immersion periods in 3.5% NaCl solution, using electrochemical and surface probe techniques. Open circuit potential (OCP) and potentiodynamic polarization revealed that the Al particles modify the electrochemical corrosion behaviour of the Ni coating by shifting its E OCP more negatively and increasing its anodic dissolution current density, after 24 h immersion in 3.5% NaCl solution. Compared with the Ni coating, the composite can exhibit wellreduced anodic current density and slightly increased cathodic current with immersion up to 72 h. XPS characterization showed that a high rate of water adsorption and rapid formation of a continuous Ni(OH) 2 initially occurs on the composite surface which, however, readily thickens during prolonged immersion time and promotes the corrosion product enrichment with Al 2 O 3 . This greatly decreased the rate of corrosion and susceptibility to pitting for the Ni-28wt.%Al composite after 72 h immersion in 3.5% NaCl solution.

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“…Surface modification through nano-crystallization of grain size, which has been achieved through various sputtering and deposition techniques, has been reported to greatly improve the corrosion resistance of these metallic materials [1][2][3][4][5][6][7][8][9][10]. Nanocrystalline Ni metal and its alloys have gained wide industrial application, especially because of the good corrosion resistance of Ni.…”

Section: Introductionmentioning

confidence: 99%

Ni Corrosion Product Layer During Immersion in a 3.5% NaCl Solution: Electrochemical and XPS Characterization

Onyeachu¹,

Oguzie²,

Ukaga³

et al. 2017

Port. Electrochim. Acta

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Long term wet corrosion resistance of metals depends on the stability of their corrosion product layer. With immersion corrosion tests, such stability can be predicted. EIS and potentiodynamic polarization were complemented with XPS to investigate the characteristics of Ni corrosion product layer formed after 1 hr. and 72 hr. immersion in 3.5% NaCl solution. Two time constants with decreasing Nyquist semi-circle size and phase angle maxima, based on EIS characterization during the immersion times, indicated the formation of an increasingly porous and less adherent corrosion product layer. The product formation shifted the Ni corrosion potential more negatively and increased cathodic and anodic current densities, during potentiodynamic polarization. XPS characterization suggested that a rapid nucleation of NiO could increase H2O adsorption, subsequently triggering the formation of different forms of Ni(OH)2 in the corrosion product layer. Consequently, the corrosion resistance of the Ni coating decreased after 72 hr. immersion in 3.5% NaCl solution.

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A novel ultrafine-grained Ni3Al with increased cyclic oxidation resistance

Cited by 41 publications

References 39 publications

Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

Characterizing the Electrochemical Corrosion Behaviour of a Ni–28wt.%Al Composite Coating in 3.5% NaCl Solution

Ni Corrosion Product Layer During Immersion in a 3.5% NaCl Solution: Electrochemical and XPS Characterization

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