K444合金表面CVD渗铝涂层耐高温95%Na2SO4 + 5%NaCl腐蚀行为研究

doi:10.11902/1005.4537.2024.029

中国腐蚀与防护学报

2025, Vol. 45

Issue (1): 127-136 CSTR: 32134.14.1005.4537.2024.029 DOI: 10.11902/1005.4537.2024.029

研究报告

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K444合金表面CVD渗铝涂层耐高温95%Na₂SO₄ + 5%NaCl腐蚀行为研究

王粤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 东北大学腐蚀与防护中心沈阳 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

Corrosion Resistance of CVD Aluminized Coating on K444 Alloy Beneath a Thin Deposits of 95%Na₂SO₄ + 5%NaCl at High Temperature

WANG Yue¹, GENG Shujiang¹(

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

1 Corrosion and Protection Center, Northeastern University, Shenyang 110819, China
2 Wuhan Research Institute of Materials Protection Co., Ltd., CAM, Wuhan 430030, China

引用本文:

王粤, 耿树江, 王金龙, 王福会, 孙清云, 吴勇, 夏思瑶. K444合金表面CVD渗铝涂层耐高温95%Na₂SO₄ + 5%NaCl腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(1): 127-136.
Yue WANG, Shujiang GENG, Jinlong WANG, Fuhui WANG, Qingyun SUN, Yong WU, Siyao XIA. Corrosion Resistance of CVD Aluminized Coating on K444 Alloy Beneath a Thin Deposits of 95%Na₂SO₄ + 5%NaCl at High Temperature[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 127-136.

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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。研究了K444合金及其CVD渗铝涂层表面沉积95% (质量分数) Na₂SO₄ + 5%NaCl混合盐在850和950 ℃空气中的高温腐蚀行为。结果表明，K444合金腐蚀10 h后，表现出较差的耐腐蚀性。其表面生成疏松的混合氧化物层，外层主要为Cr₂O₃和TiO₂，内层为Al₂O₃。随着温度升高腐蚀加剧，腐蚀层发生剥落。而CVD渗铝涂层表面生成保护性Al₂O₃膜，有效提高了抗腐蚀性能。

关键词 ：镍基高温合金, 热腐蚀, CVD渗铝涂层

Abstract：

Aluminized coating was prepared on the surface of nickel-based superalloy K444 by chemical vapor deposition (CVD) technique. The corrosion behavior of K444 alloy without and with CVD aluminized coating beneath a thin deposits film of 95%Na₂SO₄ + 5%NaCl was studied in air at 850 and 950 ^oC. The results indicate that K444 alloy showed poor corrosion resistance after 10 h corrosion. A scale of loose mixed oxides was formed on its surface, of which the outer layer is mainly composed of Cr₂O₃ and TiO₂, and the inner layer is Al₂O₃. With the increase of temperature, the corrosion was intensified and the spallation occurred of the corrosion products scale. In contrast, a protective Al₂O₃ scale was formed on the surface of the CVD aluminized coating, which effectively improves the corrosion resistance for the K444 alloy.

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

收稿日期: 2024-01-17 32134.14.1005.4537.2024.029

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, E-mail: gengsj@smm.neu.edu.cn

作者简介: 王粤，男，1998年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.029 或 https://www.jcscp.org/CN/Y2025/V45/I1/127

图1 CVD渗铝涂层表面微观形貌

图2 CVD渗铝涂层SEM截面形貌及EDS元素面分布

图3 CVD渗铝涂层的XRD谱图

图4 K444合金及其CVD渗铝涂层表面沉Na2SO4 + NaCl条件下的腐蚀动力学

图5 K444合金及其CVD渗铝涂层在850和950 ℃、Na2SO4 + NaCl环境中腐蚀10 h的表面形貌

图6 K444合金及其CVD渗铝涂层在850 ℃、Na2SO4 + NaCl条件下腐蚀10 h的SEM截面形貌及EDS元素面分布

图7 K444合金在850 ℃、Na2SO4 + NaCl条件下腐蚀10 h的SEM截面形貌及EDS点分析

图8 K444合金及其CVD渗铝涂层在950 ℃、Na2SO4 + NaCl条件下腐蚀10 h的SEM截面形貌及EDS元素面分布

图9 K444合金在950 ℃、Na2SO4 + NaCl条件下腐蚀10 h的SEM截面形貌及EDS点分析

图10 K444合金及其CVD渗铝涂层在850和950 ℃、Na2SO4 + NaCl条件下腐蚀10 h后表面的XRD谱

图11 Na2SO4-NaCl体系简化共晶相图

图12 合金元素氧化反应的Ellingham-Richardson图

图13 合金元素与固态Na2SO4反应的Ellingham-Richardson图

图14 合金元素与熔融态Na2SO4反应的Ellingham-Richardson图

图15 合金元素与熔融态NaCl反应的Ellingham-Richardson图

图16 金属氯化物与氧气反应的Ellingham-Richardson图

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