预涂覆碱金属硫酸盐的HR3C在含SO<sub>2</sub>气氛中的热腐蚀行为

doi:10.11868/j.issn.1001-4381.2015.000295

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摘要为了探讨HR3C耐SO₂腐蚀机制，应用XRD，SEM（EDS）和EMPA等分析方法对预涂覆碱金属硫酸盐的HR3C在不同温度与含量SO₂气氛中腐蚀行为进行研究。结果表明：腐蚀动力学曲线呈现“抛物线”趋势；腐蚀产物主要由（Fe，Cr）氧化物、少量尖晶石结构的复杂氧化物以及（Fe，Ni）硫化物组成；SO₂浓度的提高导致氧化膜明显增厚，劣化氧化膜与基体的结合；此外，腐蚀影响区的孔隙率增加，且在氧化物-腐蚀影响区界面处生成硫化物带。分析认为HR3C在SO₂气氛中的腐蚀是由合金元素的氧化与硫化所致；而且，金属氧化物的硫酸盐化与三元共晶复合盐的形成以及合金元素Fe在熔盐中的溶解也对HR3C合金腐蚀产生作用。

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	李萍
	秦鹏
	赵杰
	李廷举
	庞胜娇

关键词 ：超超临界发电, 烟侧腐蚀, 碱金属硫酸盐, 热腐蚀, 硫酸盐化

Abstract：The corrosion behaviors of HR3C pre-coated alkali metal sulphate in SO₂ atmosphere at different temperatures were investigated by means of XRD,SEM (EDS) and EMPA in order to discuss the corrosion resistance mechanism to SO₂ of HR3C.The results show that the corrosion kinetic curves follow parabolic law.The corrosion products are mainly composed of (Fe,Cr) oxides,minor compound oxides with spinel structure as well as (Fe,Ni) sulfides.The increment in SO₂ content increases significantly the oxide films in thickness,and deteriorates the adhesion to the oxide scale and matrix.In addition,the porosities in the corrosion affected zone (the interface between the oxide films and the matrix) increase and a CrS belt exits in the interface between the oxide layer and the corrosion affected zone.The analysis shows that the corrosion of HR3C in SO₂ environment is resulted from the oxidation,sulfidation of the alloy,moreover,the sulfation of metallic oxides and the formation of ternary composed alkali metal sulfate as well as the dissolution of Fe in melted salt also contribute to the corrosion.

Key words： ultra supercritical power generation fireside corrosion alkali metal sulfate hot-corrosion sulfation

收稿日期: 2015-03-17 出版日期: 2017-01-19

中图分类号:

TK224.9

通讯作者: 李萍(1969-),女,副教授,博士,现从事材料无损检测与评价方面的研究,联系地址:大连理工大学材料科学与工程学院(116023),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. 预涂覆碱金属硫酸盐的HR3C在含SO₂气氛中的热腐蚀行为[J]. 材料工程, 2017, 45(1): 43-51.
LI Ping, QIN Peng, ZHAO Jie, LI Ting-ju, PANG Sheng-jiao. Hot-corrosion Behavior of HR3C Pre-coated Alkali Metal Sulphate in SO₂ Atmosphere. Journal of Materials Engineering, 2017, 45(1): 43-51.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000295 或 http://jme.biam.ac.cn/CN/Y2017/V45/I1/43

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