Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment

doi:10.7652/xjtuxb202005023

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Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment

更新时间：2025-07-09

- Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment
- Vol. 54, Issue 5, Pages: 179-188(2020)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202005023
  CLC： TG178
- Online First：10 May 2020，
  
  Published：2020
- 稿件说明：
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Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment[J]. 2020, 54(5): 179-188.
DOI：

Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment[J]. 2020, 54(5): 179-188. DOI： 10.7652/xjtuxb202005023.

摘要

为了研究高温CO

环境下耐热合金HR6W和740H的腐蚀行为

开展了800、900、1 000 ℃CO

环境下的耐热合金腐蚀实验

并进行了腐蚀产物的微观表征。利用分析天平获取耐热合金腐蚀前后的质量变化

并计算其激活能; 应用激光拉曼光谱仪和X射线衍射仪对合金表面腐蚀产物进行表征分析; 利用扫描电子显微镜等设备观察样品的微观形貌

并分析腐蚀产物成分与分布。实验结果表明:两种耐热合金在高温CO

环境下的腐蚀动力曲线符合抛物线规律

HR6W和740H的激活能分别为-256.59、-293.35 kJ/mol; HR6W表面氧化产物为致密均匀的Cr

氧化层和MnCr

氧化层; 740H存在内氧化现象

外层氧化产物为TiO

氧化层和Cr

氧化层

内层氧化产物为非均匀的Al

及TiO

氧化物; 两种合金均无明显碳化现象; 对比腐蚀增质和氧化层厚度发现

HR6W的耐腐蚀性能优于740H的

这是由于740H中Ti元素的外扩散破坏了Cr

和Ti、Al元素的内氧化行为而造成的。

Abstract

The corrosion behaviors of heat-resistant alloys HR6W and 740H in carbon dioxide at 800

900

1 000 - were investigated. The weight gain of the alloys was obtained by the analytical balance and the activation energy was evaluated. Raman spectrometer and X-ray diffraction were used to characteri-e the surface of the alloys. Scanning electron microscope and other equipment were used to observe the micro-surface morphology of the alloys. The results show that the corrosion

kinetics of the alloys obeys a parabolic law. The activation energy of HR6W and 740H gets -256.59 kJ/mol and -293.35 kJ/mol

respectively. Dense oxide films of Cr

and MnCr

are formed on the surface of HR6W. In addition to the surface oxide films of TiO

and Cr

internal oxidation occurs on the surface of 740H. The outer layers consist of Cr

and TiO

the internal corrosion products are non-uniform A

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references

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