High Temperature Oxidation and Solid Na2SO4 Induced Corrosion of CVD Aluminide Coating on K444 Alloy in Air

doi:10.11902/1005.4537.2022.241

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 553-560 DOI: 10.11902/1005.4537.2022.241

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High Temperature Oxidation and Solid Na₂SO₄ Induced Corrosion of CVD Aluminide Coating on K444 Alloy in Air

LIU Shuyu¹, GENG Shujiang¹(

), WANG Jinlong¹, WANG Fuhui¹, SUN Qingyun², WU Yong², DUAN Haitao², XIA Siyao², XIA Chunhuai²

^1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Wuhan Research Institute of Materials Protection, Wuhan 430030, China

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Abstract

Aluminide coating was prepared on Ni-base superalloy K444 by chemical vapor deposition (CVD). The oxidation behavior in air at 750, 850 and 950 ℃, and solid Na₂SO₄ induced corrosion in air at 750 ℃ were investigated for K444 alloys without and with CVD aluminide coating respectively. The kinetic curves were obtained. The cross-section morphology and composition of oxidized and corroded samples were characterized by SEM/EDS and XRD. The results show that a continuous and dense Al₂O₃ scale can form on the surface of CVD aluminide coating during oxidation and corrosion, which inhibits the outward diffusion of metal elements, correspondingly, slows down the oxidation reaction and solid Na₂SO₄ induced corrosion, and therefore, significantly enhances the resistance to the high temperature oxidation in air at 750-950 ℃, as well as to the solid deposits of Na₂SO₄ induced corrosion in air at 750 ℃ of K444 alloy.

Key words: nickel-based superalloy CVD aluminized coating high-temperature oxidation corrosion of solid Na₂SO₄

Received: 24 July 2022 32134.14.1005.4537.2022.241

ZTFLH:

TG174

Fund: National Key R&D Program of China(2020YFB2010404);Key Research and Development Program of Hubei Provincial(2021BAA210)

Corresponding Authors: GENG Shujiang, E-mail: gengsj@smm.neu.edu.cn

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	Articles by authors
	LIU Shuyu
	GENG Shujiang
	WANG Jinlong
	WANG Fuhui
	SUN Qingyun
	WU Yong
	DUAN Haitao
	XIA Siyao
	XIA Chunhuai

Cite this article:

LIU Shuyu, GENG Shujiang, WANG Jinlong, WANG Fuhui, SUN Qingyun, WU Yong, DUAN Haitao, XIA Siyao, XIA Chunhuai. High Temperature Oxidation and Solid Na₂SO₄ Induced Corrosion of CVD Aluminide Coating on K444 Alloy in Air. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 553-560.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.241 OR https://www.jcscp.org/EN/Y2023/V43/I3/553

Fig.1 SEM cross-sectional morphologies with EDS elements mapping of CVD aluminide coating

Fig.2 XRD patterns of CVD aluminide coating

Fig.3 Oxidation kinetics of K444 alloy and CVD aluminide coating at 750 ℃ (a), 850 ℃ (b) and 950 ℃ (c)

Fig.4 SEM cross-sectional morphologies and EDS elements mapping of K444 alloy (a, c, e) and CVD aluminide coating (b, d, f) at 750 ℃ (a, b), 850 ℃ (c, d) and 950 ℃ (e, f) after 300 h oxidation

Fig.5 XRD patterns of K444 alloy and CVD aluminide coating oxidation at 750 ℃ (a), 850 ℃ (b) and 950 ℃ (c)

Fig.6 Corrosion kinetics of K444 alloy and CVD aluminized coating at 750 ℃-Na₂SO₄+Air

Fig.7 SEM cross-sectional morphologies with EDS elements mapping of K444 alloy (a) and CVD aluminide coating (b) after 50 h corrosion at 750 ℃-Na₂SO₄+Air

Fig.8 XRD patterns of CVD aluminized coating after 50 h corrosion at 750 ℃-Na₂SO₄+Air

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