Hot Corrosion behaviour of Nanostructured Cermet based Coatings Deposited by Different Thermal Spray Techniques: A Review

Saini, Himanshu; Kumar, Devendra; Shukla, Vaibhav Kumar

doi:10.1016/j.matpr.2017.01.055

Cited by 12 publications

(2 citation statements)

References 20 publications

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“…Hot corrosion is of two types: Type 1 (occurs above the melting point of Na 2 SO 4 ) 850°C to 950°C and Type 2 (occurs between 650°C and 750°C) (Singh et al , 2016; Cheng et al , 2019; Uusitalo et al , 2004; Adamiec, 2009). Hot corrosion not only increases the repair and maintenance cost but also threats the safe operation of the power plant (Singh et al , 2019, 2021; Liu et al , 2018; Mahajan and Chhibber, 2019; Kumar et al , 2019; Saini et al , 2017). The corrosion problem cannot be eliminated completely, but using various techniques, the related cost can be reduced by more than 30%.…”

Section: Introductionmentioning

confidence: 99%

High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment

Goyal

Singh

et al. 2023

ACMM

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Purpose This paper aims to investigate the high temperature corrosion behaviour of ZrO2-reinforced Cr2O3 matrix-based composite coatings on ASTM-SA213-T-22 steel at 900°C in molten salt environment. The different coatings were deposited by high velocity oxy fuel (HVOF) method. Design/methodology/approach Hot corrosion studies were conducted in simulated boiler environment in silicon carbide tube furnace at 900°C for 50 cycles on bare and HVOF-coated boiler steel specimens. Each cycle consisted 50 h of heating in the simulated boiler environment followed by 20 min of cooling in air. The weight change measurements were performed after each cycle to establish the kinetics of corrosion using thermogravimetric technique. X-ray diffraction and scanning electron microscopy techniques were used to analyse the corroded specimens. Findings The addition of 20 Wt.% ZrO2 in Cr2O3 helped reduce corrosion rate by 89.25% as compared to that of uncoated specimen. The phase analysis revealed the presence of Cr2O3 and ZrO2 phases in composite coating matrix, which may have prevented the base metal from interacting with the corrosive elements present in the highly aggressive environment and thus had increased the resistance to hot corrosion. Originality/value It should be mentioned here that high temperature corrosion behaviour of thermally sprayed ZrO2–Cr2O3 composite coatings has never been studied, and to the best of the authors’ knowledge, it is not available in the literature. Hence, present investigation can provide valuable information for application of ZrO2-reinforced coatings in high temperature fuel combustion environments.

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Section: Introductionmentioning

confidence: 99%

High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment

Goyal

Singh

et al. 2023

ACMM

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“…Erosion resistance is often an additional important requirement for the coatings operating in the hot sections of gas turbines. Thermal-sprayed [9], chromium-based cermet coatings represent a viable option when it is necessary to provide high hardness and corrosion resistance at temperatures up to 900 • C [10][11][12]. Corrosion resistance and toughness are provided by the metallic matrix, while the wear resistance is mainly offered by the dispersed (usually carbide-based), ceramic phase.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

et al. 2019

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Hot corrosion affects the components of diesel engines and gas turbines working at high temperatures, in the presence of low-melting salts and oxides, such as sodium sulfate and vanadium oxide. Thermal-sprayed coatings of nickel-chromium-based alloys reinforced with ceramic phases, can improve the hot corrosion and erosion resistance of exposed metals, and a sealing thermal, post-treatment can prove effective in reducing the permeability of aggressive species. In this study, the effect of purposely-optimized high-power diode laser reprocessing on the microstructure and type II hot corrosion resistance of cermet coatings of various compositions was investigated. Three different coatings were produced by high velocity oxy-fuel and was tested in the presence of a mixture of Na 2 SO 4 and V 2 O 5 at 700 • C, for up to 200 h: (i) Cr 3 C 2 -25% NiCr, (ii) Cr 3 C 2 -25% CoNiCrAlY, and (iii) mullite nano-silica-60% NiCr. Results evidenced that laser sealing was not effective in modifying the mechanism, on the basis of the hot corrosion degradation but could provide a substantial increase of the surface hardness and a significant decrease of the overall coating material consumption rate (coating recession), induced by the high temperature corrosive attack.

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Evaluation of Corrosion Resistance and Characterization of Ni-Cr Coated Structure Using Plasma Spray Coating for Marine Hulls

Singh¹,

Franco²,

Binoj³

et al. 2018

Plasmonics

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Hot Corrosion behaviour of Nanostructured Cermet based Coatings Deposited by Different Thermal Spray Techniques: A Review

Cited by 12 publications

References 20 publications

High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment

High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Evaluation of Corrosion Resistance and Characterization of Ni-Cr Coated Structure Using Plasma Spray Coating for Marine Hulls

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Hot Corrosion behaviour of Nanostructured Cermet based Coatings Deposited by Different Thermal Spray Techniques: A Review

Cited by 12 publications

References 20 publications

High temperature corrosion behaviour of ZrO2 reinforced Cr2O3 composite coatings in molten salt environment

High temperature corrosion behaviour of ZrO2 reinforced Cr2O3 composite coatings in molten salt environment

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Evaluation of Corrosion Resistance and Characterization of Ni-Cr Coated Structure Using Plasma Spray Coating for Marine Hulls

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High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment

High temperature corrosion behaviour of ZrO₂ reinforced Cr₂O₃ composite coatings in molten salt environment