Preparation and High Temperature Corrosion Behavior of Aluminized Nanocrystalline Coating on DD98M Alloy

doi:10.11902/1005.4537.2018.026

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 59-67 DOI: 10.11902/1005.4537.2018.026

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Preparation and High Temperature Corrosion Behavior of Aluminized Nanocrystalline Coating on DD98M Alloy

Hao CHEN^1,²,Qing CHEN¹,Li XIN²(

),Long SHI¹,Shenglong ZHU²,Fuhui WANG^3,⁴

1. College of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
4. Shenyang National Laboratory for Materials Science, Shenyang 110016, China

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Abstract

A nanocrystalline coating of DD98M was firstly deposited on the surface of high temperature alloy DD98M via magnetron sputtering, then a thin layer of Al-5.2Si (mass fraction, %) was next deposited via multi-arc ion plating on top of the nanocrystalline coating, which was further subjected to vacuum diffusion treatment at 870 ℃ for 3 h, finally a two-layered aluminide coating composed of an outer β-NiAl layer and an inner γ'-Ni₃Al layer was obtained on the DD98M alloy. The isothermal oxidation behavior at 1050 ℃ in air and hot corrosion performance in molten salts Na₂SO₄+25%K₂SO₄ at 900 ℃ of the plain DD98M alloy, the nanocrystalline coating or the two-layered aluminide coating coated DD98M alloy were comparatively investigated. Results revealed that after isothermal oxidation at 1050 ℃, mixed oxides of NiO, α-Al₂O₃, Ta_0.8O₂, CrTaO₄ and NiAl₂O₄ formed on the surface of DD98M alloy, and the oxide scale cracked and spalled seriously. An oxide scale composed of α-Al₂O₃ with a small amount of NiAl₂O₄ formed on the surface of the nanocrystalline coating of DD98M alloy. A dense oxide scale of simplex α-Al₂O₃ formed on the surface of the two-layered aluminide coating. It seems that the bilayered aluminide coating prepared with tri-step process can significantly enhance the oxidation resistance of the DD98M alloy. In molten salts Na₂SO₄+25%K₂SO₄ at 900 ℃, catastrophic corrosion occurred for the plain DD98M alloy only after 20 h corrosion. The as-deposited and pre-oxidation nanocrystalline coating can improved the corrosion resistance of the alloy to certain extent. However, the two-layered aluminide coating can apparently improve the corrosion resistance of the DD98M alloy.

Key words: DD98M alloy nanocrystalline coating AlSi coating vacuum diffusion treatment Isothermal oxidation hot corrosion

Received: 14 February 2018

ZTFLH:

TG174

Fund: Supported by National Natural Science Foundation of China(U1537107)

Corresponding Authors: Li XIN E-mail: xli@imr.ac.cn

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Cite this article:

Hao CHEN,Qing CHEN,Li XIN,Long SHI,Shenglong ZHU,Fuhui WANG. Preparation and High Temperature Corrosion Behavior of Aluminized Nanocrystalline Coating on DD98M Alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 59-67.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.026 OR https://www.jcscp.org/EN/Y2019/V39/I1/59

Fig.1 Cross section (a) and fracture (b) morpholo-gies of as-deposited nanocrystalline/AlSi coating

Fig.2 Cross section (a) and XRD pattern (b) of nanocrysta-lline/AlSi coating annealed at 870 ℃ in vacuum for 3 h

Fig.3 Oxidation kinetics of DD98M alloy, nanocrystalline coating and duplex coating at 1050 ℃ in air

Fig.4 XRD patterns of DD98M alloy, nanocrystalline coat-ing and duplex coating after 100 h oxidation at 1050 ℃

Fig.5 Surface (a, c, e) and cross-sectional (b, d, f) morphologies of DD98M alloy (a, b), nanocrystalline coating (c, d) and duplex coating (e, f) after 100 h oxidation in air at 1050 ℃

Fig.6 Corrosion kinetics of DD98M alloy, two types of nanocrystalline coating and duplex coating in Na₂SO₄+25%K₂SO₄ salt at 900 ℃

Fig.7 Surface (a, c, e, g, i) and cross-sectional (b, d, f, h, j) morphologies of DD98M alloy (a, b), as-deposited coating (c, d), pre-oxidized coating (e~h) and duplex coating (i, j) after hot corrosion at 900 ℃ in Na₂SO₄+25%K₂SO₄ salt for 20, 80, 100 and 100 h, respectively

Fig.8 XRD patterns of DD98M alloy (a), as-deposited coating (b), pre-oxidized coating (c) and duplex coating (d) after hot corrosion at 900 ℃ in Na₂SO₄+25%K₂SO₄ salt for 20, 80, 100 and 100 h, respectively

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