Hot corrosion behavior of Pt+Hf co-modified NiAl coating in the mixed salt of Na2SO4-NaCl at 900 °C

Yang, Yuyi; Liu, Z.L.; Ren, Peijia; Wang, Q.W.; Zhang, Bao; Zhu, Shunni; Li, W.

doi:10.1016/j.corsci.2020.108527

Cited by 25 publications

(3 citation statements)

References 34 publications

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“…When they studied the thermal corrosion of Ni-Al coating in Na 2 SO 4 + NaCl at 900 °C, Yang. et al [21] believed that Cl was oxidized first, and then reacted with metal elements in the form of Cl 2 to generate gaseous chloride, which diffused outward and then was oxidized, increasing the internal holes of the oxide film and accelerating the oxidation. Accordingly, we can judge that sufficient NaCl reacts with O 2 .…”

Section: Roughnessmentioning

confidence: 99%

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

et al. 2022

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The corrosion of cobalt-based DZ40M and nickel-based K452 superalloy at 900 °C was investigated by NaCl salt coating. Accordingly, the differences in hot corrosion behavior were analyzed considering the development methods and elementary composition by comparing the two alloys’ failure. Then, the corrosion mechanism induced by NaCl was proposed by comparing oxidation and hot corrosion behavior. The relatively continuous Al2O3 and TiO2 formed on K452 superalloy with higher content of Al and Ti have lower solubility and less damage in Na2O. Thus, the hot corrosion rate of K452 is lower than that of DZ40M with higher content of C, Cr, and W.

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Section: Roughnessmentioning

confidence: 99%

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

et al. 2022

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“…In order to mitigate or prevent hot corrosion, the preparation of protective coatings on the surface of materials is a highly economical and universally applicable method [7][8][9][10]. Currently, most researchers have aimed to investigate the hot corrosion resistance of MCrAlY (M = Fe, Ni, Co, and Pt) coatings [11][12][13]. However, there is almost no available research concerning the high-temperature hot corrosion resistance of high-entropy alloy (HEA) coatings.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi2.1 High-Entropy Alloy Coating by Laser Cladding

Zhang,

Ji,

Yang

2023

Materials

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Both crack-free AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) and Y and Hf co-doping AlCoCrFeNi2.1 EHEA (YHf-EHEA) coatings were prepared by laser cladding. The solidification microstructure, thermal stability, and hot corrosion performance of the coatings at 900 °C under 75% Na2SO4 + 25% NaCl molten salts were investigated. The experimental results showed that the structure of the as-deposited coatings consisted of FCC and BCC/B2 phases. After heat treatment, an Al-rich L12 phase was precipitated in the FCC phase of all coatings. The grain sizes of the EHEA and YHf-EHEA coatings after heat treatment at 900 °C for 10 h increased by 27.5% and 15.7%, respectively, compared to the as-deposited coatings. Meanwhile, after hot corrosion, the spallation areas of the YHf-EHEA and EHEA coatings accounted for 14.98% and 5.67% of the total surface area, respectively. In this study, the Y and Hf co-doping did not change the microstructure morphology and phase structure of the coatings but did improve the thermal stability and resistance of the hot corrosion oxide scale spallation, providing a certain amount of data and theoretical support for the application of EHEA coatings as high-temperature protective coatings.

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“…Ni-based superalloy has excellent creep resistance, high rupture strength, and corrosion resistance, so it is a perfect material for key components of aeroengines (He et al, 2015;Sun et al, 2015). They must be subjected to high temperature oxidation and hot corrosion by O 2 or other corrosive substances, for example, sulfur (Kosieniak et al, 2012;Yang et al, 2020). In heavy air pollution or coastal working environment, the metallic sulfates, such as Na 2 SO 4 , will be deposited on the surface of key components and accelerate their degradation (Eliaz et al, 2002;Wang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Zhang

Song

et al. 2021

Front. Mater.

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Aluminide coating is prepared on K438 Ni-based superalloy by pack cementation. The hot corrosion test of as-received and pre-oxidation aluminide coating in Na2SO4 salt are carried out at 1050°C. The coating morphologies, phase composition, and corrosion products are characterized by XRD, SEM, EDS, and TEM. The conclusion is that the pre-oxidation aluminide coating has excellent hot corrosion properties. After hot corrosion, the oxide scale of pre-oxidation aluminide coating is the thinnest and maintains good integrity. However, the oxide scale of as-received aluminide coating fluctuates greatly and there are corrosion cavities. CrS is formed in the alloy immediately below the oxide scale for the two coating systems.

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Hot corrosion behavior of Pt+Hf co-modified NiAl coating in the mixed salt of Na2SO4-NaCl at 900 °C

Cited by 25 publications

References 34 publications

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi2.1 High-Entropy Alloy Coating by Laser Cladding

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

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Hot corrosion behavior of Pt+Hf co-modified NiAl coating in the mixed salt of Na2SO4-NaCl at 900 °C

Cited by 25 publications

References 34 publications

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi2.1 High-Entropy Alloy Coating by Laser Cladding

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

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Hot corrosion behavior of Pt+Hf co-modified NiAl coating in the mixed salt of Na2SO4-NaCl at 900 °C