The high temperature corrosion behaviour of Hf modified chromo-aluminised coatings produced by a single step process

Du, Hailiang; Kipkemoi, J.; Τσιπάς, Δ.; Datta, P.K.

doi:10.1016/s0257-8972(96)03027-7

Cited by 38 publications

(20 citation statements)

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“…Therefore, understanding of the influence of the modifier elements on the coating structure and properties leads to an increase in their application capacities. In the past two decades, many research works were inclined to the Cr-and Pt-aluminide coatings [4][5][6][7][8][9] and there is less publication regarding Si-modified aluminide coatings. [10][11][12] This paper presents laboratory experimental results on the effect of silicon on the structure evolution and high temperature corrosion behavior of slurry aluminide coatings on the Ni-base superalloy In-738LC.…”

Section: Introductionmentioning

confidence: 99%

The role of Silicon on Microstructure and High Temperature Performance of Aluminide Coating on Superalloy In-738LC

et al. 2002

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The microstructures of slurry Si-modified aluminide coatings on Ni-base superalloy In-738LC have been investigated using SEM, TEM, EDS and XRD. The corrosion performance of the coatings has been also investigated by hot corrosion and cyclic oxidation tests. In order to evaluate the hot corrosion performance, the anodic polarization curves were measured in Na 2 SO 4 -25 mol%NaVO 3 -5 mol%NaCl at 1053 K. The cyclic oxidation test was carried out by exposure to alternate conditions of air atmosphere at 1373 K and room temperature. The analyses of SEM, EDS and XRD were also used to characterize attack morphologies of the coatings exposed to the test conditions. The results showed that the heat-treated slurry Si-modified aluminide coating was composed of β-NiAl phase including fine precipitates, which were found to be complex silicides. The results of hot corrosion tests indicated that at least 10-13 mass%Si in the coating layer is needed to improve the corrosion resistance of the aluminide coating. The coatings that met this criterion also showed a good cyclic oxidation resistance.

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Section: Introductionmentioning

confidence: 99%

The role of Silicon on Microstructure and High Temperature Performance of Aluminide Coating on Superalloy In-738LC

et al. 2002

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“…Hot corrosion resistance of aluminide coatings is improved by the addition of modifying elements like Pt [67,68], Cr [69,70] and Si [72].…”

Section: Hot Corrosion Ofpt-modified Alloys/coatings and Mcraly-basedmentioning

confidence: 99%

“…The hot corrosion resistance of Pt-modified 3-NiAl coating depends upon the substrate and their behavior has been studied on various substrates by researchers over the past 30 years. Addition of Cr has been shown to improve hot corrosion resistance of aluminide coatings at both low and high temperatures [69,70]. In addition, Cr can be beneficial by decreasing the amount of Al in the alloy required to form a protective A1 2 0 3 scale layer [ 17].…”

Section: Hot Corrosion Ofpt-modified Alloys/coatings and Mcraly-basedmentioning

confidence: 99%

“…During the past two decades, a reasonable amount of research focused on Cr-and Pt-modified P-NiAl coatings for improved hot corrosion resistance [69,72,73]. Since Cr and Si additions improve hot The results for the low-Pt-modified (up to 1 Oat %) y+y' alloys suggest that the Cr content should be either equal to or greater than Pt content for improved hot-corrosion resistance.…”

Section: ] Type I Hot Corrosion (900qc)mentioning

confidence: 99%

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Optimizing the Hot-Corrosion Resistance-of-Novel gamma-Ni+gamma-prime-Ni3A1-Based Alloys and Coatings

Gleeson¹

2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT ABSTRACTHigh temperature degradation by hot corrosion (650-1000 C) and/or oxidation (>1000 C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. There are currently no coatings that provide adequate protection to both hot corrosion and oxidation. This study assesses and advances the performance of novel modified gamma-Ni + gamma-prime Ni3AI alloys and coatings. Significant progress was achieved in this study towards the targeted goal of establishing a metallic coating that is highly resistant to both hot corrosion and high temperature oxidation. High temperature degradation by hot corrosion (650-1000'C) and/or oxidation (>1000°C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. However, as is shown in this study, the resistance of state-of-the-art commercial Pt-modified P3-NiA1 diffusion aluminides and CoCrAIY-based overlay coatings against both Type I (i.e., 900 0 C) and Type II (i.e., 705TC) hot corrosion is limited. Thus, there are currently no coatings that provide adequate protection to both hot corrosion and oxidation. There is indeed a particular need for such protective coatings because many advanced aero, marine, and industrial gas-turbines operate in both hot corrosion and oxidation regimes in their duty cycle. Gleeson et al. [1] recently reported that a wide range Pt+Hf-modified y'-Ni 3 Al + yNi alloy compositions form a thin, planar, adherent, and slow growing A1 2 0 3 scale. In fact, the results reported suggest that Pt+Hf-modified y'+y coatings offer a viable superior alternative to P-NiAl(Pt)-based coatings. Thus, a main aim of the present study was to establish and assess optimum target y' +y...

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“…Many papers have been published on the properties of the boride and aluminide layers on alloy steels. [9][10][11][13][14][15] In this paper, the codeposition of boron and aluminium on P91 heat resistant steel, applying a onestep pack cementation process, was investigated. The morphology of the layers formed within the coating, as well as the distribution of the diffused B and Al in the coating and the interface, was analysed using scanning electron microscopy (SEM) and X-ray diffraction (XRD).…”

Section: Introductionmentioning

confidence: 99%

Boro-aluminising of P91 steel by pack cementation for protection against steam oxidation

Omar

Tsipas

Maragoudakis

et al. 2011

Corrosion Engineering, Science and Technology

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High performance alloys are often the materials used for various components exposed to high temperature environments. In many cases, protective coatings are applied in these alloys, providing higher corrosion and oxidation resistance, compared to the base material. This study investigates the feasibility to apply boro-aluminising treatment on P91 steel by pack cementation process, to increase the steel high temperature properties in oxidising and corrosive environments. Packs activated by AIC 3 ,NHCI and KBF 4 were used to carry out the coating deposition at a temperature of 715ºC for 6 h. The coating formed was analysed by means of SEM and XRD, and the compounds formed were identified. Cyclic steam oxidation for a total of 1008 h at 650ºC revealed an oxide scale of 50 µm for the uncoated P91 steel, while the coated steel shows

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The high temperature corrosion behaviour of Hf modified chromo-aluminised coatings produced by a single step process

Cited by 38 publications

References 10 publications

The role of Silicon on Microstructure and High Temperature Performance of Aluminide Coating on Superalloy In-738LC

The role of Silicon on Microstructure and High Temperature Performance of Aluminide Coating on Superalloy In-738LC

Optimizing the Hot-Corrosion Resistance-of-Novel gamma-Ni+gamma-prime-Ni3A1-Based Alloys and Coatings

Boro-aluminising of P91 steel by pack cementation for protection against steam oxidation

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