NiCrAl-NiC封严涂层在硫氯酸盐中的热腐蚀行为
Hot corrosion behavior of NiCrAl-NiC sealing coating in thiochlorate
查看参考文献25篇
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文摘
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为探究NiCrAl-NiC封严涂层在高温熔盐环境下的腐蚀行为,使用大气等离子喷涂技术制备NiCrAl-NiC封严涂层。通过测量NiCrAl-NiC封严涂层的失重情况研究涂层的动力学变化,通过扫描电子显微镜(SEM)、X射线衍射(XRD)、激光共聚焦显微镜等方法,探讨NiCrAl-NiC封严涂层在650 ℃下混合硫氯酸盐(75% Na_2SO_4 + 25% NaCl)中的热腐蚀行为。结果表明:在进行10 h的热腐蚀实验后,NiCrAl-NiC封严涂层呈现出快速增重状态,增重速率为32.041 mg2·cm~(-4)·h~(-1)。在进行20 h的热腐蚀实验后,涂层由于表面氧化膜的脱落而发生减重现象。在热腐蚀进行了30 h后,涂层表面膜的生长覆盖了整个涂层,涂层表面形貌均匀,表面孔隙减少,可以对基体起到很好的保护作用。在完整的氧化膜的保护作用下,进行了40 h热腐蚀实验的NiCrAl-NiC封严涂层的质量变化速率为0.064 mg2·cm~(-4)·h~(-1);通过XRD测试探究涂层热腐蚀后氧化膜的组成,发现热腐蚀后涂层表面的氧化膜以NiO和NiCr_2O_4为主。在热腐蚀过程中,尖晶石结构的NiCr_2O_4对涂层的热腐蚀起到了阻碍作用,是涂层腐蚀进程缓慢的主要原因。 |
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其他语种文摘
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To investigate the corrosion behavior of NiCrAl-NiC sealing coating in high-temperature molten salt environments, NiCrAl-NiC sealing coating was prepared using atmospheric plasma spraying technology. By measuring the weight loss of NiCrAl-NiC sealing coating, the dynamic changes of the coating were studied. The thermal corrosion behavior of NiCrAl-NiC sealing coating in a mixture of thiochlorate(75% Na_2SO_4 + 25% NaCl) at 650 ℃ was discussed using scanning electron microscopy(SEM),X-ray diffraction(XRD),laser confocal microscopy,and other methods. The results show that after 10 h of hot corrosion experiments, the NiCrAl-NiC sealing coating exhibites a rapid weight gain state, with a weight gain rate of 32.041 mg2·cm~(-4)·h~(-1). After conducting a 20 h hot corrosion experiment,the coating experienced weight loss due to the detachment of the surface oxide film. After 30 h of hot corrosion,the growth of the facial mask on the coating surface covers the entire coating. The surface morphology of the coating is uniform, and the surface pores are reduced, which can play a good role in protecting the substrate. Under the protection of a complete oxide film, the mass change rate of the NiCrAl-NiC sealing coating after a 40 h hot corrosion experiment is 0.064 mg2·cm~(-4)·h~(-1). Through XRD testing,it is found that the composition of the oxide film on the surface of the coating after hot corrosion is mainly NiO and NiCr_2O_4. During the hot corrosion process,the spinel structure of NiCr_2O_4 hinders the hot corrosion of the coating,which is the main reason for the slow corrosion process of the coating. |
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来源
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航空材料学报
,2023,43(6):73-79 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2023.000033
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关键词
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封严涂层
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NiCrAl-NiC
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热腐蚀
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腐蚀机制
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地址
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沈阳理工大学环境与化学工程学院, 沈阳, 110159
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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金属学与金属工艺 |
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基金
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沈阳理工大学高水平成果建设项目
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沈阳理工大学科研创新团队支持项目
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文献收藏号
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CSCD:7642449
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