Enhancing the Oxidation Resistance of NiCrAlY Bond Coat by High-Current Pulsed Electron Beam Irradiation

Mei, Xianxiu; Zhang, Xiaonan; Zhang, Lisong; Li, Na; Zhang, Peng; Guo, Yuting; Koval, N. N.

doi:10.3390/coatings11080912

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…The Cr 2 O 3 coating exhibited cracks (Figure 3(b)) due to residual stress during solidification [31] and cooling of the coating [32]. Additionally, there were pores observed between the top and bonding layers (Figures 3(b) and 3(c)) resulting from unmelted or partially melted particles, attributed to the difference in melting points of the powders (Cr 2 O 3 : 2435 °C [33] and NiCrAlY: 1356 °C [31], as reported by Abbasi et al [11], Nu et al [4], and Gerald et al [34]. Figure 3(c) shows that the Cr 2 O 3 coating displayed alternate dark and lighter splats with some unmelted particles.…”

Section: Surface Morphologies and Particle Sizes Of The Powdersmentioning

confidence: 99%

Corrosion Behaviour of a Cr2O3 Coating on Mild Steel in Synthetic Mine Water

Hango,

Cornish,

van der Merwe

et al. 2024

International Journal of Corrosion

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The Cr2O3 coating on the surface of ASTM A516 Grade 70 mild steel substrates was developed using the thermal plasma spraying process for protection against corrosion and wear. The microstructural behaviours for both coating and substrate were analysed using SEM and XRD techniques. The corrosion behaviours of the coatings and substrate in synthetic mine water with varying pH values (6, 3, and 1) were evaluated according to ASTM standards for potentiodynamic polarisation measurements. Tafel plots were drawn to determine the corrosion rates. Vickers hardness of the coatings and substrate were measured. The Cr2O3 coating exhibited cracks due to the solidification and cooling process, as well as some pores between the top and bonding layers caused by unmelted or partially melted particles. The corrosion tests revealed that a decrease in pH levels led to increased corrosion rates in both samples. The Cr2O3 coating demonstrated superior corrosion resistance, ranging from 0.036±0.003 mm/year to 0.110±0.004 mm/year, compared to the mild steel substrate, which ranged from 0.262±0.021 mm/year to 0.336±0.026 mm/year, across all pH values. Moreover, it exhibited significantly greater hardness (1260±77 HV3) than the mild steel substrate (180±14 HV3). The lower corrosion rates and higher hardness of Cr2O3 coating than the mild steel substrate make it a suitable coating in applications where corrosion resistance and high hardness properties are essential.

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Section: Surface Morphologies and Particle Sizes Of The Powdersmentioning

confidence: 99%

Corrosion Behaviour of a Cr2O3 Coating on Mild Steel in Synthetic Mine Water

Hango,

Cornish,

van der Merwe

et al. 2024

International Journal of Corrosion

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“…Scientists have produced a significant amount of research on high-temperature protection coatings of nickel and nickel alloys, including the selection of coating materials [7,8], coating preparation [9,10], coating modifications [11,12], properties [13,14], and oxidationresistance mechanisms [15,16]. These research results have promoted the development of high-temperature protection fields and also provided guidance for the development of this project.…”

Section: Introductionmentioning

confidence: 99%

Study on High-Temperature Oxidation Behavior of Platinum-Clad Nickel Composite Wire

Chen

Saibei

Zhao

et al. 2023

Metals

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Platinum-clad nickel composite wires with platinum layer thicknesses of 5 μm and 8 μm were prepared by a cladding drawing process. Oxidation experiments were performed using a muffle furnace at temperatures of 500 °C, 600 °C, 700 °C, and 800 °C for 1 h, 2 h, and 3 h. The oxidized samples were examined for high-temperature oxidation behavior using scanning electron microscopy (SEM) with an energy-dispersive X-ray (EDX) spectrometer attached. The results showed that the interface bond between the platinum cladding and the nickel core wire was serrated and that the thickness of the platinum cladding was not uniform. At low temperatures (500 °C and 600 °C), the diffusion rate of the nickel was low. The composite wire could be used for a short time below 600 °C. When the temperature reached 700 °C and above, the nickel diffused to the surface of the composite wire and was selectively oxidized to form a nickel oxide layer. The research results provide a theoretical reference for the selection of a service temperature for platinum-clad nickel composite wires used as the lead material for thin-film platinum resistance temperature sensors.

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