Short-term Hot Corrosion Behavior of Nickel-based Single Crystal Superalloy N5 and its Nanocrystalline Coating

doi:10.11902/1005.4537.2025.104

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (1): 252-260 DOI: 10.11902/1005.4537.2025.104

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Short-term Hot Corrosion Behavior of Nickel-based Single Crystal Superalloy N5 and its Nanocrystalline Coating

YANG Xiaowen, CHEN Zehao, YANG Shasha, WANG Qunchang, WANG Jinlong(

), CHEN Minghui, WANG Fuhui

State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China

Cite this article:

YANG Xiaowen, CHEN Zehao, YANG Shasha, WANG Qunchang, WANG Jinlong, CHEN Minghui, WANG Fuhui. Short-term Hot Corrosion Behavior of Nickel-based Single Crystal Superalloy N5 and its Nanocrystalline Coating. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 252-260.

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Abstract

The nanocrystalline coatings of Ni-based single crystal superalloy N5 with and without addition of 0.5%(mass fraction) Y were prepared on the superalloy N5 by magnetron sputtering technology, and then their short-term hot corrosion behavior was studied beneath deposit films of 75%Na₂SO₄ + 25% K₂SO₄ at 850 ^oC, and 75%Na₂SO₄ + 25%NaCl (in mass fraction) at 900 ^oC in air. The results showed that the bare N5 exhibited poor corrosion resistance. Although, the N5 alloy with nanocrystalline coatings showed excellent corrosion resistance to the mixed salts, but, the enhanced corrosion resistance to the NaCl containing salts was not obvious for the N5 nanocrystalline coating and the Y-modified ones. Besides, scale spallation and internal corrosion occurred for the coatings after 5 h corrosion test. The corrosion resistance of nanocrystalline coatings can be significantly improved by proper pre-oxidation at 1000 ^oC for 20 h, the pre-formed oxide scale was able to suppress the attack of the molten salts to certain extent and thus delay the corrosion.

Key words: superalloy nanocrystalline coating hot corrosion pre-oxidation corrosion behavior

Received: 30 March 2025 32134.14.1005.4537.2025.104

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	YANG Xiaowen
	CHEN Zehao
	YANG Shasha
	WANG Qunchang
	WANG Jinlong
	CHEN Minghui
	WANG Fuhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.104 OR https://www.jcscp.org/EN/Y2026/V46/I1/252

Fig.1 Fracture morphology (a), cross-sectional SEM image (b), cross-sectional TEM image (c) and phase constituents of the as-deposited sputtered nanocrystalline (SN) coating (d)

Table 1 WDS results of the areas marked by blue numbers in Fig.1b

Fig.2 Kinetic curves of N5 alloy and nanocrystalline coating after hot corrosion in molten mixed sulfates

Fig.3 XRD patterns of N5 alloy and SN coating after hot corrosion in molten mixed sulfates

Fig.4 Surface morphologies of N5 alloy (a, b) and SN coating (c, d) after hot corrosion in molten mixed sulfates and corresponding EDS results

Fig.5 Cross-sectional morphologies and corresponding EDS line scanning results of N5 alloy (a, c, e) and SN coating (b, d, f) after hot corrosion in molten mixed sulfates

Fig.6 XRD patterns of N5 alloy and SN coatings after hot corrosion for 5 h

Fig.7 Micro morphologies of N5 alloy (a, b) and SN coating (c, d) after hot corrosion for 5 h

Table 2 EDS results of the points marked in Fig.7 and 11

Fig.8 Cross-sectional morphologies of Y-modified na-nocrystalline coating after preoxidation at 1000 ^oC for 1 (a) and 20 h (b)

Fig.9 Macrographs of SNY coatings after hot corrosion for 5 h (a) and 20 h (b, c) with preoxidation 1 (b) and 20 h (c)

Fig.10 XRD patterns of SNY coatings after hot corrosion

Fig.11 Hot corrosion micro morphologies of SNY (a, b), preoxidation for 1 h (c, d) and preoxidation for 20 h (e, f)

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