K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响

doi:10.11902/1005.4537.2023.182

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 612-622 CSTR: 32134.14.1005.4537.2023.182 DOI: 10.11902/1005.4537.2023.182

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K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响

徐佳新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

Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750^oC for CVD Aluminized Coatings on K452 Superalloy

XU Jiaxin¹, 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:

徐佳新, 耿树江, 王金龙, 王福会, 孙清云, 吴勇, 夏思瑶. K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(3): 612-622.
Jiaxin XU, Shujiang GENG, Jinlong WANG, Fuhui WANG, Qingyun SUN, Yong WU, Siyao XIA. Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750^oC for CVD Aluminized Coatings on K452 Superalloy[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 612-622.

全文: PDF(16822 KB) HTML

摘要:

采用化学气相沉积(CVD)技术在K452合金表面沉积渗铝涂层，沉积温度分别为850、950和1050℃。研究了沉积温度对CVD渗铝涂层在750℃空气中表面沉积Na₂SO₄及Na₂SO₄ + NaCl环境下热腐蚀行为的影响。采用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)对腐蚀前和后的试样进行截面形貌观察和物相结构分析。结果表明，在750℃下表面沉积Na₂SO₄及Na₂SO₄ + NaCl热腐蚀50 h后，3种涂层试样均表现出了较K452合金更好的抗热腐蚀性能，且涂层的抗热腐蚀性能随着涂层沉积温度的增加而增强。

关键词 ： CVD渗铝涂层, 沉积温度, Na₂SO₄腐蚀, Na₂SO₄+NaCl腐蚀

Abstract：

Aluminized coatings were deposited on K452 superalloy by chemical vapor deposition (CVD) technique at the temperatures 850, 950 and 1050^oC, respectively. The effect of deposition temperature on the corrosion behavior of K452 alloys without and with CVD aluminized coatings was comparatively investigated beneath deposits of Na₂SO₄ and Na₂SO₄ + NaCl (3 ± 0.2 mg/cm²), respectively in air at 750^oC. Then their cross-sectional morphologies and phase structures were characterized by SEM/EDS and XRD. The results showed that all the aluminized coatings exhibited better corrosion resistance to the deposits of Na₂SO₄ and Na₂SO₄ + NaCl as compared to the bare K452 alloy after 50 h of corrosion. Notably, the corrosion resistance of the coatings was increased with the increase in deposition temperatures.

Key words： CVD aluminized coatings deposition temperature Na₂SO₄-induced corrosion Na₂SO₄ + NaCl-induced corrosion

收稿日期: 2023-06-01 32134.14.1005.4537.2023.182

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: 徐佳新，女，1998年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.182 或 https://www.jcscp.org/CN/Y2024/V44/I3/612

图1 3种渗铝涂层的XRD谱

图2 3种渗铝涂层的截面形貌及EDS元素面扫描

图3 K452合金及其3种渗铝涂层表面沉积Na2SO4在750℃空气中的腐蚀动力学曲线

图4 K452合金以及3种渗铝涂层表面沉积Na2SO4盐膜条件下在750℃空气中热腐蚀50 h的截面形貌及EDS元素面扫描

图5 K452合金及其3种渗铝涂层表面沉积Na2SO4在750℃空气中热腐蚀50 h的XRD谱

图6 K452合金及其3种渗铝涂层表面沉积Na2SO4 + NaCl在750℃空气中的腐蚀动力学曲线

图7 K452合金以及3种涂层试样表面沉积Na2SO4 + NaCl在750℃空气中腐蚀50 h的截面形貌及EDS元素面扫描

图8 K452合金及3种渗铝涂层表面沉积Na2SO4 + NaCl在750℃空气中腐蚀50 h的XRD谱

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