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材料工程  2016, Vol. 44 Issue (11): 45-50    DOI: 10.11868/j.issn.1001-4381.2016.11.007
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
冷喷涂CoNiCrAlY涂层在Na2SO4熔盐中的热腐蚀行为
张林伟1,2, 王鲁2, 王全胜2, 陆磊1, 宁先进2
1. 江西省科学院 应用物理研究所, 南昌 330029;
2. 北京理工大学 材料学院, 北京 100081
Hot Corrosion Behavior of Cold-sprayed CoNiCrAlY Coating in Na2SO4 Salt
ZHANG Lin-wei1,2, WANG Lu2, WANG Quan-sheng2, LU Lei1, NING Xian-jin2
1. Institute of Applied Physics, Jiangxi Academy of Science, Nanchang 330029, China;
2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
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摘要 利用冷喷涂技术制备CoNiCrAlY涂层,并对涂层进行了真空预氧化处理。结合X射线衍射,扫描电镜,能谱分析等方法研究预氧化处理前后的CoNiCrAlY涂层在900℃的Na2SO4熔盐中的热腐蚀行为。结果表明:冷喷涂CoNiCrAlY涂层含氧量为0.12%(质量分数),孔隙率小于0.28%(体积分数)。真空预氧化处理在涂层表面生成厚约0.26μm连续、致密的α-Al2O3氧化膜;喷涂态涂层和预氧化涂层在热腐蚀150h后表面均生成了以α-Al2O3为主的致密连续氧化膜,保护了基体免受腐蚀破坏;真空预氧化处理有效减缓了S和O等元素向涂层内扩散的速率,从而提高了涂层的抗Na2SO4熔盐热腐蚀性能;高温热腐蚀对涂层的破坏作用远大于高温氧化。在相同温度下,涂层在单一Na2SO4熔盐中腐蚀时,Al的消耗速率约为高温氧化时的2倍。
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张林伟
王鲁
王全胜
陆磊
宁先进
关键词 MCrAlY涂层热腐蚀冷喷涂真空预氧化高温氧化    
Abstract:CoNiCrAlY coatings were prepared by cold spray process. After deposition, the pre-oxidation treatment of the coating was performed by vacuum heat-treatment. The microstructure and phase constituent of coating were characterized by XRD, SEM and EDS. The hot corrosion behavior of as-sprayed and pre-oxidized CoNiCrAlY coatings in molten Na2SO4 at 900℃ was also studied. The results show that the as-sprayed coating presents a dense structure with low porosity (less than 0.28%, volume fraction) and low oxygen content (0.12%, mass fraction). Vacuum pre-oxidation treatment forms a continuous and dense α-Al2O3 layer on the coating surface, with an average thickness of about 0.26μm. As-sprayed and pre-oxidized coatings can protect the substrate from hot corrosion due to the formation of a continuous and dense α-Al2O3 layer. Moreover, the vacuum pre-oxidation treatment can alleviate the diffusion of S and O into coating, and thus the hot corrosion resistance of coating is improved. The damage of hot corrosion plays a more important role than high temperature oxidation. When corrosion in single Na2SO4 molten salt with the same temperature, the consumption speed of Al is two times of that in high temperate oxidation
Key wordsMCrAlY coating    hot corrosion    cold spray    vacuum pre-oxidation    high temperature oxidation
收稿日期: 2015-01-05      出版日期: 2016-11-22
中图分类号:  TG174.422  
通讯作者: 宁先进(1974-),男,博士,主要从事冷喷涂涂层制备与性能研究,联系地址:北京理工大学材料学院(100081),E-mail:nxj@bit.edu.cn     E-mail: nxj@bit.edu.cn
引用本文:   
张林伟, 王鲁, 王全胜, 陆磊, 宁先进. 冷喷涂CoNiCrAlY涂层在Na2SO4熔盐中的热腐蚀行为[J]. 材料工程, 2016, 44(11): 45-50.
ZHANG Lin-wei, WANG Lu, WANG Quan-sheng, LU Lei, NING Xian-jin. Hot Corrosion Behavior of Cold-sprayed CoNiCrAlY Coating in Na2SO4 Salt. Journal of Materials Engineering, 2016, 44(11): 45-50.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.11.007      或      http://jme.biam.ac.cn/CN/Y2016/V44/I11/45
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