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材料工程  2016, Vol. 44 Issue (2): 69-74    DOI: 10.11868/j.issn.1001-4381.2016.02.011
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
涂覆Na2SO4-25%NaCl盐膜的Super304H的热腐蚀行为
李萍, 秦鹏, 赵杰, 李廷举, 庞胜娇
大连理工大学 材料科学与工程学院, 辽宁 大连 116024
Hot Corrosion Behavior of Super304H Coated Na2SO4-25%NaCl Film
LI Ping, QIN Peng, ZHAO Jie, LI Ting-ju, PANG Sheng-jiao
College of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
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摘要 应用增重分析法研究涂有Na2SO4-25%NaCl盐膜的Super304H在650,750℃空气中的腐蚀动力学曲线,采用XRD,SEM(EDS)和EPMA对腐蚀产物、腐蚀截面形貌和元素分布进行分析。结果表明:涂覆Na2SO4-25%NaCl盐膜的合金在650,750℃的腐蚀动力学曲线均呈"抛物线"趋势;合金表面形成了含CuFe2O4的富Fe氧化物(外层)与富Cr2O3(内层)组成的双层氧化膜以及含有孔隙的贫Cr、富Ni的腐蚀影响区;提高腐蚀温度或延长腐蚀时间均可以导致氧化膜与基体分离甚至剥落,腐蚀影响区孔隙密度增大,裂纹向基体延伸。分析认为:腐蚀初期合金发生选择性氧化,形成多层氧化膜;复合盐的熔融破坏氧化膜的完整性,加速氧化、氯化以及硫化的交互作用,导致内硫化和内氧化。
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李萍
秦鹏
赵杰
李廷举
庞胜娇
关键词 热腐蚀氯化硫化氧化    
Abstract:Corrosion kinetics curves of Super304H coated with Na2SO4-25%NaCl at 650℃ and 750℃ in the air were investigated by applying weight analysis method. The corrosion product, cross-section appearance and elements distribution were analyzed by XRD, SEM equipped with EDS, and EPMA. The results show that the corrosion kinetics curves at 650℃ and 750℃are in parabolic trend. A two-layered complex oxide film with the outer Fe rich oxide layer containing CuFe2O4 and inner Cr2O3rich layer and the poor Cr, rich Ni corrosion affected zone containing voids; Increasing the temperature or prolonging the corrosion time can result in the separation or even spalling of oxide film from the base alloy, and porosity density increases in the corrosion affected zone, cracks propagate to the base metal. Analysis shows that the selective oxidation occurs at the early corrosion stage and forms multi-layer oxide film; the molten salts destroy the integrity of the oxide film and accelerate the interaction among oxidation, chlorination and sulfuration during the corrosion processing, which results in the severe internal oxidation and sulfuration.
Key wordshot corrosion    chlorination    sulfuration    oxidation
收稿日期: 2014-12-05      出版日期: 2016-02-22
中图分类号:  TG172  
通讯作者: 李萍(1969-),女,副教授,博士,主要从事材料无损表征与评价方面研究工作,联系地址:大连理工大学材料科学与工程学院(116024),E-mail:liping69@dlut.edu.cn     E-mail: liping69@dlut.edu.cn
引用本文:   
李萍, 秦鹏, 赵杰, 李廷举, 庞胜娇. 涂覆Na2SO4-25%NaCl盐膜的Super304H的热腐蚀行为[J]. 材料工程, 2016, 44(2): 69-74.
LI Ping, QIN Peng, ZHAO Jie, LI Ting-ju, PANG Sheng-jiao. Hot Corrosion Behavior of Super304H Coated Na2SO4-25%NaCl Film. Journal of Materials Engineering, 2016, 44(2): 69-74.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.02.011      或      http://jme.biam.ac.cn/CN/Y2016/V44/I2/69
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