Corrosion resistance by HVOF coating on gas turbine materials of cobalt based superalloy

Prabhakaran, D.; Jegadeeswaran, N.; Somasundaram, B.; Raju, B.S.

doi:10.1016/j.matpr.2019.10.102

Cited by 4 publications

(5 citation statements)

References 9 publications

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“…Finally, the loose and porous Cr 2 O 3 is formed at the airmolten salt interface. The pores and defects formed in the corrosion film promote the inward transport of Cl 2 and O 2 in Formulas ( 2)-( 4) and the outward diffusion and oxidation of gaseous chloride in Formulas ( 7)- (9). A large amount of CoO and NiO are generated in the outer layer of the corrosion product layer, and the thickness of Cr 2 O 3 is also significantly increased.…”

Section: Roughnessmentioning

confidence: 99%

“…Part of the research aimed at the hot corrosion caused by Na 2 SO 4 and NaVO 3 molten salt, affecting inland gas turbine blades. The investigations believe that the equilibrium phase of Na 2 O and SO 3 produced by Na 2 SO 4 decomposition leads to alkaline or acidic dissolution of oxide film [8][9][10]. For example, D. Prabhakaran et al [9] studied the hot corrosion behavior of SuperCo-605 in this environment and found that the oxidation products were mainly Cr 2 O 3 , MnO, NiO, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The investigations believe that the equilibrium phase of Na 2 O and SO 3 produced by Na 2 SO 4 decomposition leads to alkaline or acidic dissolution of oxide film [8][9][10]. For example, D. Prabhakaran et al [9] studied the hot corrosion behavior of SuperCo-605 in this environment and found that the oxidation products were mainly Cr 2 O 3 , MnO, NiO, etc. Hu et al [10] studied the hot corrosion behavior of Ni-Cr coating in pure Na 2 SO 4 molten salt.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…However, mild steel is susceptible to corrosion and wear when exposed to harsh environments, leading to surface damage and poor performance [6]. To mitigate these issues, various techniques such as thermal plasma spraying, high-velocity oxy-fuel spraying (HVOF), chemical vapour deposition, magnetron sputtering, and ion implantation have been used to provide corrosion and wear-resistant surfaces for mild steel under different operating conditions [7][8][9]. Plasma coating is considered the most reliable method as it produces coatings with high bond strength, thicknesses ranging from ~100 to 300 μm, and are free from oxides and porosity [3,10,11].…”

Section: Introductionmentioning

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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“…The hot-end components of modern aero-engines are exposed to complex working conditions during operations, e.g., in sulfur-containing gases at temperatures over 1000 °C [ 1 , 2 ]. To protect the hot-end components, thermal barrier coatings (TBCs) are extensively applied [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of High Al Content on the Phase Constituents and Thermal Properties in NiCoCrAlY Alloys

Zhang,

Nie,

Tan

et al. 2024

Materials

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MCrAlY (M = Ni and/or Co) metallic coatings are essential for the protection of hot-end components against thermal and corrosion damage. Increasing the Al content is considered a feasible solution to improve the high-temperature performance of MCrAlY coatings. In this paper, the effects of high Al contents (12–20 wt.%) on the phase constituents and cast microstructures in MCrAlY alloys were studied by high-energy X-ray diffraction and electron microscopy techniques combined with phase equilibria calculations. High Al content improved the stability of β, σ, and α phases. Meanwhile, an evolution of the cast microstructure morphology from a dendrite structure to an equiaxed grain structure was observed. The thermal properties were analyzed, which were closely related to the phase constituents and solid-to-solid phase transitions at evaluated temperatures. This work is instructive for developing high-Al-content MCrAlY coatings for next-generation thermal barrier applications.

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Corrosion resistance by HVOF coating on gas turbine materials of cobalt based superalloy

Cited by 4 publications

References 9 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

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

Effects of High Al Content on the Phase Constituents and Thermal Properties in NiCoCrAlY Alloys

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