Structure and Hot Corrosion Behavior of an Al-Co-Y Co-deposited Coating on TiAl Alloy

Wei, Zekun; Li, Xuan; Lv, Wei; Bai, Ming; Li, Yongquan; Liu, Xing; Lai, Shaoyong; Liu, Fuhua

doi:10.1007/s11665-022-07481-1

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…During hot corrosion process, there was an external diffusion of Al element from TiAl2 inner layer of the Si-Co-Y coating. Under the synergistic effect of Co and Y, a continuous and dense corrosion product scale mainly composed of Al2O3 layer was formed, Zhou et al [33] found that the addition of Y can promote the diffusion of Co in during coating formation process, resulting in an even distribution of Co. Wei et al [5] also have found that Co has the ability to delay the diffusion of S, which slows down the sulfidation-oxidation rate, thereby improving the hot corrosion resistance of the coating.…”

Section: Morphology Of Hot Corrosion Productsmentioning

confidence: 99%

“…Unfortunately, TiAl alloys exhibit relatively poor anti-hot corrosion resistance, as they prone to react with corrosive substances such as oxygen, Cland SO2 at high temperatures. The formed corrosion products are loose, porous, and easy to peel off, significantly compromising safety and service life [4,5]. Therefore, enhancing the hot corrosion resistance of TiAl alloy is imperative to enable their use as hot end components.…”

Section: Introductionmentioning

confidence: 99%

“…In recent decades, various methods have been utilized to prepare protective coatings for TiAl alloys, such as aluminide coatings (TiAl3, TiAl2, etc.) [5], M-CrAlY (M=Ni, Co or NiCo) coatings [6,7], ceramic coatings [8,9], silicide coatings [10][11][12] and composite coatings doped with noble metals [13]. Among the these coating systems, silicide coatings exhibit excellent thermal stability and can form a flowable and self-healing SiO2 protective scale at high temperatures, making them suitable for load-bearing applications in TiAl alloys [14].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

Li,

Lv,

Xie

et al. 2023

High Temperature Corrosion of mater.

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Si-Co-Y diffusion coatings were deposited on TiAl-Nb alloy using pack cementation process. The influence of activators and deposition temperatures on the coating structures was investigated, alongside the coating formation process and hot corrosion performance of the optimized coating in molten salt of 25%NaCl+75%K2SO4 at 850 ℃. The results show that a dense and compact Si-Co-Y diffusion coating can be prepared on TiAl-Nb alloy, with a multi-layered structure including an outmost layer of (Ti,X)Si2 (X represents Co, Al, Nb, Y), an outer layer composed of TiSi2+Ti5Si4+Ti5Si3 mixtures, a middle layer of Ti5Si3, and an inner layer of TiAl2. The coating prepared with AlCl3•6H2O and NH4Cl had many pores. Increase in deposition temperature led to a higher coating growth rate within the range of 1050-1100 o C, but temperature exceeding 1100 ℃ caused the formation of intensive holes in the coating. Hot corrosion tests at high temperatures proved that the Si-Co-Y diffusion coating prepared on TiAl-Nb alloy exhibited excellent hot corrosion resistance in 25%NaCl-75%K2SO4 molten at 850 o C. A protective hot corrosion product scale composed of a TiO2+Na2SiO3+Na2TiO3 outer layer and an Al2O3 middle layer, formed on coating after hot corrosion for 50 h. The scale can effectively inhibit the inward diffusion of corrosion medial of O, Cl and S elements.

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Section: Morphology Of Hot Corrosion Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

Li,

Lv,

Xie

et al. 2023

High Temperature Corrosion of mater.

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The Chemical Compatibility Between an Innovative Superhydrophobic and Oleophobic Ultrafine Dry Powder Extinguishing Agent and Representative Aerospace Aluminum Alloy

Liu,

Chen,

Wang

et al. 2025

J. of Materi Eng and Perform

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Microstructure and hot corrosion property of a Si-Co-Y diffusion coating deposited on TiAl-Nb alloy

Li,

Lv,

Xie

et al. 2023

Preprint

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Si-Co-Y diffusion coatings were deposited on TiAl-Nb alloy using pack cementation process. The influence of activators and deposition temperatures on the coating structures was investigated, alongside the coating formation process and hot corrosion performance of the optimized coating in molten salt of 25%NaCl+75%K2SO4 at 850 ℃. The results show that a dense and compact Si-Co-Y diffusion coating can be prepared on TiAl-Nb alloy, with a multi-layered structure including an outmost layer of (Ti,X)Si2 (X represents Co, Al, Nb, Y), an outer layer composed of TiSi2+Ti5Si4+Ti5Si3 mixtures, a middle layer of Ti5Si3, and an inner layer of TiAl2. The coating prepared with AlCl3·6H2O and NH4Cl had many pores. Increase in deposition temperature led to a higher coating growth rate within the range of 1050-1100 oC, but temperature exceeding 1100 ℃ caused the formation of intensive holes in the coating. Hot corrosion tests at high temperatures proved that the Si-Co-Y diffusion coating prepared on TiAl-Nb alloy exhibited excellent hot corrosion resistance in 25%NaCl-75%K2SO4 molten at 850 oC. A protective hot corrosion product scale composed of a TiO2+Na2SiO3+Na2TiO3 outer layer and an Al2O3 middle layer, formed on coating after hot corrosion for 50 h. The scale can effectively inhibit the inward diffusion of corrosion medial of O, Cl and S elements.

show abstract

Structure and Hot Corrosion Behavior of an Al-Co-Y Co-deposited Coating on TiAl Alloy

Cited by 4 publications

References 25 publications

Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

The Chemical Compatibility Between an Innovative Superhydrophobic and Oleophobic Ultrafine Dry Powder Extinguishing Agent and Representative Aerospace Aluminum Alloy

Microstructure and hot corrosion property of a Si-Co-Y diffusion coating deposited on TiAl-Nb alloy

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