Inconel 718及其渗铝涂层在Na2SO4 + 5%NaCl混合盐膜下的热腐蚀行为

doi:10.11902/1005.4537.2023.221

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 623-634 CSTR: 32134.14.1005.4537.2023.221 DOI: 10.11902/1005.4537.2023.221

研究报告

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Inconel 718及其渗铝涂层在Na₂SO₄ + 5%NaCl混合盐膜下的热腐蚀行为

胡琪¹, 耿树江¹(

), 王金龙¹, 王福会¹, 孙清云², 吴勇², 夏思瑶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.中国机械总院集团武汉材料保护研究所有限公司武汉 430030

Hot Corrosion Behavior of Inconel 718 Without and With Aluminide Coating in Air Beneath a Thin Film of Salt Mixture of Na₂SO₄ + 5%NaCl

HU Qi¹, GENG Shujiang¹(

), WANG Jinlong¹, WANG Fuhui¹, SUN Qingyun², WU Yong², XIA Siyao²

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

引用本文:

胡琪, 耿树江, 王金龙, 王福会, 孙清云, 吴勇, 夏思瑶. Inconel 718及其渗铝涂层在Na₂SO₄ + 5%NaCl混合盐膜下的热腐蚀行为[J]. 中国腐蚀与防护学报, 2024, 44(3): 623-634.
Qi HU, Shujiang GENG, Jinlong WANG, Fuhui WANG, Qingyun SUN, Yong WU, Siyao XIA. Hot Corrosion Behavior of Inconel 718 Without and With Aluminide Coating in Air Beneath a Thin Film of Salt Mixture of Na₂SO₄ + 5%NaCl[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 623-634.

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摘要:

采用化学气相沉积(CVD)工艺在镍基高温合金Inconel 718上制备了铝化物涂层，研究了Inconel 718合金及其渗铝涂层在750，850和950℃空气中Na₂SO₄ + 5% (质量分数)NaCl混合盐膜下的热腐蚀行为。结果表明：基体表现出较差的抗腐蚀性能，且温度越高腐蚀越严重；腐蚀初期表面腐蚀产物主要由Cr₂O₃和Fe₂O₃组成，而随着腐蚀时间增加，尖晶石为主要腐蚀产物。此外，基体合金在850和950℃时的腐蚀膜疏松多孔，观察到开裂和剥落，抗腐蚀能力差；而渗铝涂层表现良好，腐蚀期间表面会形成Al₂O₃膜，极大提高了基体合金的抗腐蚀性能。虽然当腐蚀温度升高或腐蚀时间增加时，涂层会发生明显退化，且会导致腐蚀膜出现裂纹、孔洞等缺陷，其与涂层结合不紧密，但仍能在很大程度上有效保护基体。

关键词 ： Inconel 718, CVD渗铝涂层, Na₂SO₄ + 5%NaCl, 热腐蚀

Abstract：

Aluminide coating was prepared on Inconel 718 superalloy by chemical vapor deposition (CVD). The hot corrosion behavior of Inconel 718 without and with aluminide coating beneath a thin film of salt mixture of Na₂SO₄ (95%) + NaCl (5%) in air at 750, 850 and 950^oC was studied respectively. The results indicate that Inconel 718 alloy shows poor corrosion resistance, and the higher the temperature, the more serious the corrosion. In the early stage of hot corrosion, the surface corrosion products are mainly composed of Cr₂O₃ and Fe₂O₃. As the corrosion time increases, spinel oxide becomes the main corrosion products. In addition, the scale on Inconel 718 alloy formed at 850 and 950^oC is loose and porous, while cracking and peeling were observed. For the aluminide coated alloy, it performs well with enhanced corrosion resistance, while an Al₂O₃ scale is formed on the coating surface during corrosion. Although the coating underwent significant degradation with the increasing corrosion temperature and/or corrosion time. Besides, the formed corrosion scale is not tightly boned to the coating, while the defects such as cracks or voids are observed. Even so, the coating can still protect the substrate effectively to a great extent.

Key words： Inconel 718 CVD aluminide coating Na₂SO₄ + 5%NaCl hot corrosion

收稿日期: 2023-07-13 32134.14.1005.4537.2023.221

ZTFLH:

TG174

基金资助:国家重点研发计划(2020YFB2010400);湖北省重点研发计划(2021BAA210)

通讯作者: 耿树江，E-mail: gengsj@smm.neu.edu.cn，研究方向为金属材料的高温腐蚀与防护

Corresponding author: GENG Shujiang, Email: gengsj@smm.neu.edu.cn

作者简介: 胡琪，男，1996年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.221 或 https://www.jcscp.org/CN/Y2024/V44/I3/623

图1 沉积态涂层的形貌与相组成

图2 Inconel 718合金和CVD渗Al涂层在750，850和950℃下Na2SO4 + 5%NaCl混合盐膜下的热腐蚀50 h的质量变化曲线

图3 Inconel 718合金和渗Al涂层在750，850和950℃的Na2SO4 + 5%NaCl混合盐膜下热腐蚀1 h的表面形貌

表1 对应图3不同区域的EDS分析 (atomic fraction / %)

图4 Inconel 718合金和CVD渗Al涂层在750，850和950℃的Na2SO4 + 5%NaCl混合盐中热腐蚀1 h的截面形貌

图5 Inconel 718合金和CVD渗Al涂层在不同温度热腐蚀1 h后的XRD谱

图6 Inconel 718合金和渗Al涂层在750，850和950℃的Na2SO4 + 5%NaCl混合盐中热腐蚀50 h后的表面形貌

表2 对应图6不同区域的EDS分析 (atomic fraction / %)

图7 Inconel 718合金和CVD渗Al涂层在750，850和950℃的Na2SO4 + 5%NaCl混合盐中热腐蚀50 h后的截面形貌

图8 Inconel 718合金和渗Al涂层在不同温度腐蚀50 h后的XRD谱

图9 主要合金元素氧化反应的Ellingham-Richardson图

图10 Na2SO4-NaCl体系简化共晶相图

图11 合金元素与熔融态Na2SO4反应的Ellingham-Richardson图

图12 合金元素与熔融态NaCl反应的Ellingham-Richardson图

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