CYCLIC OXIDATION AND HOT CORROSION BEHAVIORS OF A GRADIENT NiCoCrAlYSi COATING

doi:10.11900/0412.1961.2016.00013

Acta Metall Sin

2016, Vol. 52

Issue (5): 625-631 DOI: 10.11900/0412.1961.2016.00013

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CYCLIC OXIDATION AND HOT CORROSION BEHAVIORS OF A GRADIENT NiCoCrAlYSi COATING

Xin PENG^1,²,Sumeng JIANG³,Xudong SUN¹(

),Jun GONG³,Chao SUN³

1 Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 AVIC Shenyang Liming Aero-engine (Group) Corporation Ltd., Shenyang 110043, China
3 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Xin PENG, Sumeng JIANG, Xudong SUN, Jun GONG, Chao SUN. CYCLIC OXIDATION AND HOT CORROSION BEHAVIORS OF A GRADIENT NiCoCrAlYSi COATING. Acta Metall Sin, 2016, 52(5): 625-631.

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Abstract

MCrAlY (M=Ni and/or Co) coatings are widely used as overlays or bond coats for thermal barrier coatings due to their good performance against high temperature oxidation and hot corrosion. Usually, high Al content in the MCrAlY coatings can benefit the performance and lifetimes of the coatings. However, MCrAlY coatings usually contain only restricted Al content because high Al content might lead to brittleness and potential crack. Design of gradient coating can be used to solve the problem, since it can provide a balance between high Al content and high stress bearing ability. Therefore, much attention has been paid to coatings with gradient structures, and these coatings show good oxidation and corrosion resistance. In this work, a gradient and a conventional NiCoCrAlYSi coating were prepared by arc ion plating technique and subsequent annealing treatment. Cyclic oxidation tests of the two coatings were carried out between room temperature and 1000 ℃. The hot corrosion tests of the coatings were performed in two different mixed salts of 75%Na₂SO₄+25%K₂SO₄ and 75%Na₂SO₄+25%NaCl (mass fraction) at 900 ℃. The results indicated that the gradient coating possessed a graded distribution of Al-rich outer layer and Cr-rich inner layer after annealing treatment, and it showed better performance of re-healing alumina scale due to its possession of more β phase as Al reservoir during the cyclic oxidation. The degradation process of the gradient coating was favorably retarded by the formation of Cr(W, Re)-rich precipitates in the interdiffusion zone. In sulphates, the two coatings showed good corrosion resistance. The presence of NaCl aggravated the corrosion extent of the two coatings. Compared with the conventional coating, the gradient coating postponed the formation of internal oxidation and sulfidation, resulting from the gradient distribution of Al-enriched outer layer and Cr-enriched inner layer.

Key words: gradient coating arc ion plating cyclic oxidation hot corrosion

Received: 06 January 2016

ZTFLH:

Fund: Supported by National Natural Science Foundation of China (No.51001106)

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	Xin PENG
	Sumeng JIANG
	Xudong SUN
	Jun GONG
	Chao SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00013 OR https://www.ams.org.cn/EN/Y2016/V52/I5/625

Table 1 Nominal compositions of Ni-based alloy and NiCoCrAlYSi target (mass fraction / %)

Fig.1 XRD spectra of as-annealed conventional and gradient NiCoCrAlYSi coatings

Fig.2 Cross-sectional BSE images of as-annealed conventional (a) and gradient (b) NiCoCrAlYSi coatings (TCP—topologically close pack)

Fig.3 Element concentration profiles through the thickness of gradient NiCoCrAlYSi coating after annealing

Fig.4 Cyclic oxidation kinetic curves of conventional and gradient NiCoCrAlYSi coatings from 1000 ℃ to room temperature

Fig.5 XRD spectra of conventional and gradient NiCoCrAlYSi coatings after cyclic oxidation from 1000 ℃ to room temperature for 200 cyc

Fig.6 Cross-sectional BSE images of conventional (a) and gradient (b) NiCoCrAlYSi coatings after cyclic oxidation from 1000 ℃ to room temperature for 200 cyc

Fig.7 Corrosion kinetic curves of conventional and gradient NiCoCrAlYSi coatings in 75%Na₂SO₄+25%K₂SO₄ (a) and 75%Na₂SO₄+25%NaCl (b) at 900 ℃

Fig.8 XRD spectra of conventional and gradient NiCoCrAlYSi coatings after corrosion in 75%Na₂SO₄+25%K₂SO₄ at 900 ℃

Fig.9 Cross-sectional BSE images of conventional (a) and gradient (b) NiCoCrAlYSi coatings after corrosion for 100 h in 75%Na₂SO₄+25%K₂SO₄ at 900 ℃

Fig.10 XRD spectra of conventional and gradient NiCoCrAlYSi coatings after corrosion for 100 h in 75%Na₂SO₄+25%NaCl at 900 ℃

Fig.11 Cross-sectional BSE images of conventional (a) and gradient (b) NiCoCrAlYSi coatings after corrosion for 100 h in 75%Na₂SO₄+25%NaCl at 900 ℃

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