Corrosion Resistance of K444 Alloy without and with CVD Aluminized Coatings Beneath NaCl Deposit in Air at 750 ℃

doi:10.11902/1005.4537.2022.129

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 321-328 DOI: 10.11902/1005.4537.2022.129

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Corrosion Resistance of K444 Alloy without and with CVD Aluminized Coatings Beneath NaCl Deposit in Air at 750 ℃

LIU Shuyu, GENG Shujiang(

), MA Yimeng, WANG Jinlong, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

Aluminized coatings were prepared on high temperature alloy K444 by chemical vapor deposition (CVD) at 850, 950 and 1050 ℃, respectively. All the prepared coatings are two layered structure, the outer layer is NiAl phase, and the inner layer is interdiffusion zone. The thickness of the aluminized coating increases with the increase of deposition temperature. The thickness of the aluminized coating prepared at three deposition temperatures is 6.2, 12.5 and 30.3 μm, respectively. The corrosion behavior of K444 alloy without and with CVD aluminized coatings beneath NaCl deposit in air at 750 ℃ was studied. The results show that the bare K444 alloy is seriously corroded by oxidation and chlorination due to the presence of NaCl. However, a protective Al₂O₃ scale is formed on the surface of the CVD aluminized coatings, and thus their corrosion resistance is enhanced. The CVD aluminized coating prepared at 1050 ℃ has the strongest corrosion resistance.

Key words: nickel-based superalloy CVD aluminized coating NaCl corrosion

Received: 28 April 2022 32134.14.1005.4537.2022.129

ZTFLH:

TG172

Fund: National Key R&D Program of China(2020YFB2010404)

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	LIU Shuyu
	GENG Shujiang
	MA Yimeng
	WANG Jinlong
	WANG Fuhui

Cite this article:

LIU Shuyu, GENG Shujiang, MA Yimeng, WANG Jinlong, WANG Fuhui. Corrosion Resistance of K444 Alloy without and with CVD Aluminized Coatings Beneath NaCl Deposit in Air at 750 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 321-328.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.129 OR https://www.jcscp.org/EN/Y2023/V43/I2/321

Fig.1 SEM cross-sectional morphologies with EDS elements mapping of CVD aluminized coatings prepared at different deposition temperatures: (a) 850 ℃, (b) 950 ℃, (c) 1050 ℃

Fig.2 XRD patterns of CVD aluminized coatings deposited at three temperatures

Fig.3 Corrosion kinetic curves of K444 alloy and CVD aluminized coatings at 750 ℃-NaCl+Air

Fig.4 SEM cross-sectional morphologies with EDS elements mapping of K444 alloy after 1 h (a) and 10 h (b) corrosion at 750 ℃-NaCl+Air

Fig.5 XRD patterns of K444 alloy after corrosion at 750 ℃-NaCl+Air

Fig.6 SEM cross-sectional morphologies with EDS elements mapping of CVD aluminized coatings prepared at different deposition temperatures after 1 h corrosion at 750 ℃-NaCl+Air: (a) 850 ℃, (b) 950 ℃, (c) 1050 ℃

Fig.7 XRD patterns of CVD aluminized coatings prepared at different deposition temperatures after 1 h corrosion at 750 ℃-NaCl+Air

Fig.8 SEM cross-sectional morphologies with EDS elements mapping of CVD aluminized coatings prepared at different deposition temperatures after 10 h corrosion at 750 ℃-NaCl+Air: (a) 850 ℃, (b) 950 ℃, (c) 1050 ℃

Fig.9 XRD patterns of CVD aluminized coatings prepared at different deposition temperatures after 10 h corrosion at 750 ℃-NaCl+Air

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