Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy

doi:10.11900/0412.1961.2020.00246

Acta Metall Sin

2021, Vol. 57

Issue (6): 780-790 DOI: 10.11900/0412.1961.2020.00246

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Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy

WANG Di¹^,²(

), WANG Dong², XIE Guang², WANG Li², DONG Jiasheng², CHEN Lijia¹

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

WANG Di, WANG Dong, XIE Guang, WANG Li, DONG Jiasheng, CHEN Lijia. Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy. Acta Metall Sin, 2021, 57(6): 780-790.

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Abstract

Pt-Al coating has been widely used in engine rotor blades because of its ability to improve the oxidation and hot corrosion resistance of Ni-based superalloys. However, the effect exerted by Pt on S and other refractory elements, as well as the rupture mechanisms, is under debate. To investigate the influence of Pt-Al coating on the corrosion resistance of single-crystal superalloy at high temperature, the hot corrosion test utilized Na₂SO₄ salt coated on the surface of the Pt-Al coating samples and the uncoated ones were carried out at 900^oC, respectively. Using several techniques, such as XRD, SEM, EDS, and EPMA, the influence of Pt-Al coating on the hot corrosion behaviors of a Ni-based single-crystal superalloy was analyzed. Moreover, the hot corrosion kinetics, hot corrosion products, and microstructure evolution during the process were analyzed. The results reveal that the hot corrosion resistance of the substrate alloy was enhanced by Pt-Al coating. The hot corrosion rate of the Pt-Al coating sample was lower than that of the uncoated one. Thus, it can be inferred that Pt-Al coating exhibited better hot corrosion resistance. Pt prevented the diffusion of S into the β-(Ni, Pt)Al phase. The S atom was present at the oxide-metal interface, which reduced the hot corrosion rate of the substrate alloy. The presence of Pt in the β-(Ni, Pt)Al obstructed the great mass of Ta in the inter diffusion zone, which led to the diffusion of only a small quantity of Ta atoms into the oxide, and reduced the formation of Ta₂O₅. Finally, Pt-Al coating was also found to restrain to some extent the void formation at the oxide-metal interface.

Key words: Pt-Al coating hot corrosion single-crystal superalloy Ni-based alloy

Received: 09 July 2020

ZTFLH:

TG174.31

Fund: National Key Research and Development Program of China(2016YFB0701403);National Science and Technology Major Project(2017-Ⅵ-0019-0091);National Natural Science Foundation of China(51771204)

About author: WANG Di, Tel: (024)23748876, E-mail: diwang@imr.ac.cn

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	Di WANG
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	Guang XIE
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	Lijia CHEN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00246 OR https://www.ams.org.cn/EN/Y2021/V57/I6/780

Fig.1 BSE image of cross-sectional microstructure of Pt-Al coating (IDZ—inter diffusion zone)

Fig.2 Macroscopic surfaces of uncoated (a) and Pt-Al coating (b) samples in atmosphere furnace at 900^oC for 140 h hot corrosion test

Fig.3 Mass change curves of uncoated and Pt-Al coating samples in atmosphere furnace at 900^oC hot corrosion test

Fig.4 XRD spectra of surface of uncoated and Pt-Al coating samples in atmosphere furnace at 900^oC for 140 h hot corrosion test

Fig.5 BSE images of surface morphologies of uncoated (a) and Pt-Al coating (b) samples in atmosphere at 900^oC for 140 h hot corrosion test

Fig.6 BSE images of cross-sectional microstructures of uncoated (a) and Pt-Al coating (b) samples in atmosphere furnace at 900^oC for 140 h hot corrosion test (SRZ—secondary reaction zone)

Table 1 EDS results of different positions of uncoated and Pt-Al coating samples in Fig.6

Table 2 Statistics of thicknesses of cross-sectional structure of Pt-Al coating sample intial and after hot corrosion test

Fig.7 SEM images and EPMA element distributions of uncoated (a) and Pt-Al coating (b) samples cross-section in atmosphere furnace at 900^oC for 140 h hot corrosion test

Table 3 Changes in the standard Gibbs free energy (ΔG_f) for products at 827 and 927^oC^[28]

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