Comparative Study of Hot Corrosion Behavior of theEnamel Based Composite Coatings and the ArcIon Plating NiCrAlY on TiAl Alloy

doi:10.11900/0412.1961.2018.00293

Acta Metall Sin

2019, Vol. 55

Issue (2): 229-237 DOI: 10.11900/0412.1961.2018.00293

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Comparative Study of Hot Corrosion Behavior of theEnamel Based Composite Coatings and the ArcIon Plating NiCrAlY on TiAl Alloy

Yimin LIAO¹, Min FENG¹, Minghui CHEN¹(

), Zhe GENG², Yang LIU³, Fuhui WANG¹, Shenglong ZHU³

1 Shenyang National Key Laboratory for Materials Science, Northeasten University, Shenyang 110819, China
2 Department of Precision Manufacturing Engineering, Suzhou Institute of Industrial Technology, Suzhou 215104, China
3 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Yimin LIAO, Min FENG, Minghui CHEN, Zhe GENG, Yang LIU, Fuhui WANG, Shenglong ZHU. Comparative Study of Hot Corrosion Behavior of theEnamel Based Composite Coatings and the ArcIon Plating NiCrAlY on TiAl Alloy. Acta Metall Sin, 2019, 55(2): 229-237.

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Abstract

TiAl intermetallic alloys have attracted great attention for its potential application in preparing low pressure turbine blades in aircraft engine. However, its poor oxidation and corrosion resistance becomes a challenge at temperatures above 800 ℃, which leads to the developing of protective coatings. Enamel coating is considered as one of the candidates that match the TiAl alloy well, meanwhile provide corrosion protection. Enamel coating has many advantages such as high thermochemical stability, adjustable thermal expansion coefficient and simple preparation process. This study comparatively investigates hot corrosion behavior of the Ti-45Al-2Mn-2Nb alloy, the traditional NiCrAlY coating and the enamel based composite coating in (75%Na₂SO₄+25%NaCl, mass fraction) melted salt. Results indicate that after 80 h of hot corrosion, the bare alloy has completely destroyed. For the NiCrAlY coating, it protects the underlying alloy well by forming a protective Al₂O₃ scale initially. However, serious interdiffusion between coating and substrate results in the degeneration of the coating as well as the scale. At the same time, the basic dissolution of Al₂O₃ film accelerates corrosion. So obvious spallation takes place after 60 h corrosion. The enamel based composite coating shows excellent thermal stability and low corrosion rate. During the whole hot corrosion test, it still retains its original blue glazing color and luster. Furthermore, the enamel coating suppresses the inward diffusion of oxygen and corrosive ions into the alloy substrate, and thus, it protects the TiAl alloy well from corrosion of the molten (75%Na₂SO₄+25%NaCl, mass fraction) salt.

Key words: enamel coating hot corrosion NiCrAlY coating TiAl alloy

Received: 01 July 2018

ZTFLH:

TG174.4

Fund: Supported by National Natural Science Foundation of China (Nos.51471177 and 51871051), Fundamental Research Funds for the Central Universities (No.N160205001), Natural Science Foundation of Jiangsu Province of China (No.BK20160353) and Natural Science Foundation of Jiangsu Higher Education Institutions (No.16KJB460032)

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	Yimin LIAO
	Min FENG
	Minghui CHEN
	Zhe GENG
	Yang LIU
	Fuhui WANG
	Shenglong ZHU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00293 OR https://www.ams.org.cn/EN/Y2019/V55/I2/229

Fig.1 Hot corrosion kinetics curves of TiAl alloy, NiCrAlY coating and the enamel based composite coating at 850 ℃

Fig.2 Macrographs of bare TiAl alloy (a), NiCrAlY coating (b) and the enamel based composite coating (c) after hot corrosion at 850 ℃ for different time

Fig.3 Hot corrosion kinetics curve of the enamel based composite coating at 850 ℃

Fig.4 XRD spectra of TiAl alloy (a), NiCrAlY coating (b) and the enamel based composite coating (c) before (as fired) and after hot corrosion at 850 ℃

Fig.5 Low (a, c, e) and high (b, d, f) magnified surface morphologies of bare TiAl alloy (a, b), NiCrAlY coating (c, d) and the enamel based composite coating (e, f) respectively after hot corrosion 80 h (a, b) and 180 h (c~f) at 850 ℃ (Insets show the amplified characteristic regions)

Table 1 EDS analyses of positions a and b in Fig.6f

Fig.6 Low (a, c, e) and high (b, d, f) magnified cross-sectional morphologies of bare TiAl alloy (a, b), NiCrAlY coating (c, d) and the enamel based composite coating (e, f) respectively after hot corrosion 80 h (a, b) and 180 h (c~f) at 850 ℃

Fig.7 Element depth profiles (analyzed by EDS) of TiAl alloy with NiCrAlY coating (a) and the enamel based composite coating (b) after hot corrosion at 850 ℃ for 180 h

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