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材料工程  2018, Vol. 46 Issue (8): 134-139    DOI: 10.11868/j.issn.1001-4381.2016.000772
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
一种新型钴基高温合金在900℃熔融NaCl中的热腐蚀行为
张莹, 高博, 王磊, 宋秀
东北大学 材料各向异性与织构教育部重点实验室, 沈阳 110819
Hot Corrosion Behavior of a Novel Co-base Superalloy in Molten NaCl at 900℃
ZHANG Ying, GAO Bo, WANG Lei, SONG Xiu
Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education), Northeastern University, Shenyang 110819, China
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摘要 采用浸盐法研究一种新型钴基高温合金在900℃熔融NaCl中的热腐蚀行为。结果表明:腐蚀初期合金发生选择性氧化,在表面生成Al2O3,Cr2O3和少量的TiO2。随着腐蚀时间的延长,熔融NaCl开始侵蚀表面保护性Cr2O3和Al2O3,使腐蚀性介质与基体逐渐接触,加速合金腐蚀。随着腐蚀的进行,合金内腐蚀层生成棒状Al2O3。由于基体中Al的消耗,棒状Al2O3周围易生成Co3W。Co3W与棒状Al2O3的相界面形成氧扩散的快速通道,导致80h后合金热腐蚀加剧。
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关键词 钴基高温合金熔融NaCl热腐蚀    
Abstract:Hot corrosion behavior of a new cobalt-base superalloy at 900℃ in the molten NaCl was investigated by salt-leaching method. The results show that the selective oxidation occurs at the initial stage of corrosion, and the oxidation films including Al2O3, Cr2O3 and a small amount of TiO2 are formed on the surface of the superalloy. However, the protective Cr2O3 and Al2O3 are corroded by the molten NaCl and then the substrate is exposed to the corrosive substances, so that the corrosion rate is accelerated. During the corrosion, rod Al2O3 is formed in inner corrosion layer, and then Co3W is easily formed around Al2O3 owing to the depletion of Al element in the matrix. As a result, a fast path for O diffusion is formed in the interface between Co3W and rod Al2O3 phase, resulting in the increase of hot corrosion rate after 80h.
Key wordsCo-base superalloy    molten NaCl    hot corrosion
收稿日期: 2016-06-23      出版日期: 2018-08-17
中图分类号:  TG146.1  
通讯作者: 王磊(1961-),男,教授,博士生导师,研究方向:高温合金、材料环境力学行为,联系地址:辽宁省沈阳市和平区文化路3-11号东北大学材料科学与工程学院(110819),E-mail:wanglei@mail.neu.edu.cn     E-mail: wanglei@mail.neu.edu.cn
引用本文:   
张莹, 高博, 王磊, 宋秀. 一种新型钴基高温合金在900℃熔融NaCl中的热腐蚀行为[J]. 材料工程, 2018, 46(8): 134-139.
ZHANG Ying, GAO Bo, WANG Lei, SONG Xiu. Hot Corrosion Behavior of a Novel Co-base Superalloy in Molten NaCl at 900℃. Journal of Materials Engineering, 2018, 46(8): 134-139.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000772      或      http://jme.biam.ac.cn/CN/Y2018/V46/I8/134
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