Hot Corrosion Behaviour of CNT Reinforced Zirconium Yttrium Coatings in Molten Salt Environment

Kumar, Sandeep; Bhatia, Rakesh; Singh, Harmanpreet

doi:10.1007/s40735-020-00378-3

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The scale was removed in the form of tiny flakes after the cracks were formed on the surface of uncoated sample. The intense spallation of oxide scale was also observed by Kumar et al , 2020b; Goyal et al (2019) and Katiki et al (2014). The macrograph of uncoated corroded specimen showed major cracks on the surface.…”

Section: Discussionsupporting

confidence: 54%

“…Thus, CNT plays a vital role in the reduction of hot corrosion. The voids, cracks and micro holes in the coating microstructure were filled with the CNT, which acts as a barrier to the corrosive elements (Kumar et al , 2020a, 2020b; Alia et al , 2017b; Gell et al , 2018). Therefore, based on the present research work, it can be concluded that CNT reinforcement in ZrO 2 Y 2 O 3 coatings was able to provide better corrosion resistance than the conventional coatings for boiler alloy steel at an elevated working temperature.…”

Section: Discussionmentioning

confidence: 99%

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Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Kumar

Bhatia²,

Singh³

2021

ACMM

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Purpose In Indian thermal power plants, the main cause of boiler tube failure is the presence of molten sulphates and vanadates, which deteriorate the tube material at high temperatures. To combat the hot corrosion failure of metals, thermal spray technology is adopted. This study aims to investigate and study the effect of hot corrosion behaviour of carbon nanotube (CNT)-reinforced ZrO2-Y2O3 composite coatings on T-91 boiler tube steel in a molten salt environment at 900 °C for 50 cycles. Design/methodology/approach A plasma spray technique was used for development of the coatings. The samples were exposed to hot corrosion in a silicon tube furnace at 900 °C for 50 cycles. After testing, the test coupons were analysed by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and cross-sectional analysis techniques to aid understanding the kinetics of the corrosion reaction. Findings CNT-based reinforced coatings showed lower weight gain along with the formation of protective oxide scales during the experimentation. Improvement in protection against hot corrosion was observed with increase in CNT content in the coating matrix. Originality/value It is pertinent to mention here that the high temperature behaviour of CNT-reinforced ZrO2-Y2O3 composite on T-91 steel at 900°C temperature in molten salt environment has never been studied. Thus, the present research was conducted to provide useful results for the application of CNT-reinforced composite coatings at elevated temperature.

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Kumar

Bhatia²,

Singh³

2021

ACMM

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“…26 Kumar et al reported on CNT reinforced coatings achieving lower weight gain due to carbon nanotubes having nano-sizes distributed equally in between the coating matrix, leading to an obtained uniform microstructure. 27 Goyal et al investigated hot corrosion and discovered that CNT-reinforced chromium oxide coatings improve hot corrosion stability, reduce pores in coatings, and prevent corrosive species penetrating to the substrate surface. 28 Hetzner et al investigated tungsten-modified hydrogenated amorphous carbon coatings deposited on high-speed steel.…”

Section: Introductionmentioning

confidence: 99%

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method

Kuruba¹,

Gaikwad²,

Shivalingappa³

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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The thermal power plant boiler tubes experience degradation of their surfaces due to oxidation and molten salt corrosion while working at elevated temperatures. The formation of protective coating layers can overcome such surface degradation. In the current research, protective coated layers composed of Cr3C2-25% NiCr/Carbon nanotube coatings are deposited on the ASTM SA-213T12 boiler tube substrate by the High-Velocity Oxy-Fuel (HVOF) thermal method. The coating powder Cr3C2-25%NiCr is reinforced with 3, 5 and 7 wt% of Multi-Wall Carbon Nano-Tube (MWCNT) prior to deposition. The uncoated and coated specimens are evaluated for hot corrosion behaviour in the molten salt environment (Na2SO4 + 60%V2O5) for 50 cycles, constituting 1 h of heating at 600 °C. Thermogravimetric analysis is used to investigate the kinetics of hot corrosion behaviour in both coated and uncoated samples. Coatings are characterized with the help of X-ray diffraction and Scanning Electron Microscope/Energy Dispersive Spectroscopy (SEM/EDS) techniques. Microstructural investigations with the help of SEM/EDS and X-ray diffraction of coated and uncoated samples revealed that 7 wt% of CNT coated samples minimized the voids and pores of the coatings, leading to better interlocking with the substrate surface. Furthermore, it is observed in the studies that the appreciable corrosion resistance of 7 wt% of CNT composite coatings is higher than 3 and 5 wt% of CNT-coated and uncoated samples.

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Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

Hariharan¹,

Anderson²,

Ravikumar³

2022

Recent Advances in Thermofluids and Manufacturing Engineering

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Hot Corrosion Behaviour of CNT Reinforced Zirconium Yttrium Coatings in Molten Salt Environment

Cited by 6 publications

References 24 publications

Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method

Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

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Hot Corrosion Behaviour of CNT Reinforced Zirconium Yttrium Coatings in Molten Salt Environment

Cited by 6 publications

References 24 publications

Hot corrosion behaviour of CNT-reinforced ZrO2-Y2O3 composite coatings on boiler tube steel at 900°C

Hot corrosion behaviour of CNT-reinforced ZrO2-Y2O3 composite coatings on boiler tube steel at 900°C

Hot-corrosion behaviour of CNT reinforced Cr3C2-NiCr coatings working under high-temperature sprayed by HVOF method

Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

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Resources

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Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Hot corrosion behaviour of CNT-reinforced ZrO₂-Y₂O₃ composite coatings on boiler tube steel at 900°C

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method