Stripping and Refurbishment of (Ni, Pt)Al Coating After Service for Different Oxidation Durations

doi:10.11902/1005.4537.2024.226

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 201-208 DOI: 10.11902/1005.4537.2024.226

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Stripping and Refurbishment of (Ni, Pt)Al Coating After Service for Different Oxidation Durations

ZHANG Caiyun¹^,², LI Shuai², BAO Zebin¹^,²(

), ZHU Shenglong¹^,², WANG Fuhui¹

1 Corrosion and Protection Center, Northeastern University, Shenyang 110819, China
2 Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

ZHANG Caiyun, LI Shuai, BAO Zebin, ZHU Shenglong, WANG Fuhui. Stripping and Refurbishment of (Ni, Pt)Al Coating After Service for Different Oxidation Durations. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 201-208.

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Abstract

The stripping and refurbishment of single-phase (Ni, Pt)Al coating after oxidation for different times was investigated, especially in terms of the microstructure evolution of coating and substrate. The (Ni, Pt)Al coating was prepared on a Ni-based single crystal superalloy N5 firstly via electro-deposition of a thin Pt-film and followed by above-pack aluminizing. Afterwards, the prepared (Ni, Pt)Al coating/N5 alloy was oxidized in air at 1100 ^oC for 300, 1000 and 3000 h, respectively, where in all cases Al₂O₃ was the exclusive oxide product on all the test coatings. Moreover, with the increase of oxidation time, the coating degraded severely and coarse TCP precipitates emerged out beneath the coating. The (Ni, Pt)Al coatings after oxidation for various times were successfully removed with mixed solution of HCl and C₆H₈O₇·H₂O. Finally, a fresh (Ni, Pt)Al coating was refurbished again on the alloy of the deteriorated coating being removed. During the stripping with mixed acids, the dissolution of coating is mainly ascribed to corrosion of grain boundaries, while the dissolution rate decreases with the reduction of Al-content. However, the microstructure of the refurbished (Ni, Pt)Al coating is little different from those prepared on the as received alloy, nevertheless, it is observed that the coarse precipitates of TPC phase emerged on the alloy side after long time oxidation.

Key words: superalloy (Ni, Pt)Al coating high-temperature oxidation stripping refurbishment

Received: 26 July 2024 32134.14.1005.4537.2024.226

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(52301116; 51671202)

Corresponding Authors: BAO Zebin, E-mail: zbbao@imr.ac.cn

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	ZHANG Caiyun
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https://www.jcscp.org/EN/10.11902/1005.4537.2024.226 OR https://www.jcscp.org/EN/Y2025/V45/I1/201

Fig.1 Surface (a) and cross-sectional (b) morphologies, and XRD pattern (c) of the as-prepared (Ni, Pt)Al coating

Fig.2 XRD patterns of (Ni, Pt)Al-O300, (Ni, Pt)Al-O1000 and (Ni, Pt)Al-O3000 coating samples

Fig.3 Surface morphologies of (Ni, Pt)Al-O300 (a), (Ni, Pt)Al-O1000 (b) and (Ni, Pt)Al-O3000 (c) coating samples

Fig.4 Cross-sectional morphologies of (Ni, Pt)Al-O300 (a, d), (Ni, Pt)Al-O1000 (b, e) and (Ni, Pt)Al-O3000 (c, f) coating samples

Table 1 EDS determined chemical compositions of the marked areas in Fig.4

Fig.5 Surface (a-c) and cross-sectional (d) morphologies of (Ni, Pt)Al-O300 coating sample after stripping

Table 2 EDS analysis results of the marked areas in Fig.5

Fig.6 Cross-sectional morphologies of (Ni, Pt)Al-O300 (a, b) (Ni, Pt)Al-O1000 (c, d) and (Ni, Pt)Al-O3000 (e, f) samples after immersion in stripping solution for 9 min (a), 35 min (b), 35 min (c), 70 min (d), 35 min (e) and 100 min (f)

Fig.7 XRD patterns of (Ni,Pt)Al-R300, (Ni,Pt)Al-R1000 and (Ni, Pt)Al-R3000 coatings

Fig.8 Surface (a1-c1) and cross-sectional (a2-c2) morphologies of (Ni, Pt)Al-R300 (a), (Ni, Pt)Al-R1000 (b) and (Ni, Pt)Al-R3000 (c) coating samples

Fig.9 EBSD images of (Ni, Pt)Al-R300 (a), (Ni, Pt)Al-R1000 (b) and (Ni, Pt)Al-R3000 (c) coatings

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