K444合金表面CVD铝化物涂层的高温氧化和固态Na<sub>2</sub>SO<sub>4</sub>诱导的空气腐蚀

doi:10.11902/1005.4537.2022.241

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 553-560 CSTR: 32134.14.1005.4537.2022.241 DOI: 10.11902/1005.4537.2022.241

研究报告

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K444合金表面CVD铝化物涂层的高温氧化和固态Na₂SO₄诱导的空气腐蚀

刘姝妤¹, 耿树江¹(

), 王金龙¹, 王福会¹, 孙清云², 吴勇², 段海涛², 夏思瑶², 夏春怀²

^1.东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819
^2.武汉材料保护研究所有限公司武汉 430030

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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摘要:

采用化学气相沉积 (CVD) 技术在镍基高温合金K444表面制备了渗铝涂层，对比研究了K444合金及其CVD渗铝涂层在不同温度下 (750、850和950 ℃) 的高温氧化行为和750 ℃-Na₂SO₄+Air条件下的腐蚀行为，获得了氧化和腐蚀动力学。利用SEM/EDS和XRD对氧化和腐蚀后的表面膜截面形貌和组成进行了观察和分析。结果表明，CVD渗铝涂层氧化及腐蚀时表面均能生成连续致密的Al₂O₃薄膜，抑制了金属元素的外扩散，减缓了氧化反应和与固态Na₂SO₄的反应，显著提升了K444合金的抗氧化能力和750 ℃下抗固态Na₂SO₄腐蚀的能力。

关键词 ：镍基高温合金, CVD渗铝涂层, 高温氧化, 固态Na₂SO₄腐蚀

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

收稿日期: 2022-07-24 32134.14.1005.4537.2022.241

ZTFLH:

TG174

基金资助:国家重点研发计划(2020YFB2010404);湖北省重点研发计划(2021BAA210)

通讯作者: 耿树江，E-mail：gengsj@smm.neu.edu.cn，研究方向为高温腐蚀与防护

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

作者简介: 刘姝妤，女，1999年生，硕士生

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引用本文:

刘姝妤, 耿树江, 王金龙, 王福会, 孙清云, 吴勇, 段海涛, 夏思瑶, 夏春怀. K444合金表面CVD铝化物涂层的高温氧化和固态Na₂SO₄诱导的空气腐蚀[J]. 中国腐蚀与防护学报, 2023, 43(3): 553-560.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.241 或 https://www.jcscp.org/CN/Y2023/V43/I3/553

图1 CVD渗铝涂层SEM截面形貌及EDS元素面分布

图2 CVD渗铝涂层的XRD谱

图3 K444合金及其CVD渗铝涂层在750，850和950 ℃的氧化动力学

图4 K444合金及CVD渗铝涂层在750，850和950 ℃下氧化300 h的SEM截面及元素的EDS面分布

图5 K444合金及其CVD渗铝涂层在750, 850 and 950 ℃下氧化300 h的XRD谱

图6 K444合金及其CVD渗铝涂层在750 ℃-Na2SO4+Air条件下的腐蚀动力学

图7 K444合金及其CVD渗铝涂层在750 ℃-Na2SO4+Air条件下腐蚀50 h的SEM截面及元素的EDS面分布

图8 CVD渗铝涂层在750 ℃-Na2SO4+Air条件下腐蚀50 h的XRD谱

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