超临界二氧化碳环境中800H合金的均匀腐蚀行为
General Corrosion Behavior of Alloy 800H in Supercritical Carbon Dioxide
摘 要
在650 ℃、20 MPa的超临界二氧化碳(sCO2)环境中对800H合金进行了均匀腐蚀试验。运用扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)等手段对腐蚀后试样表面的氧化膜形貌、成分和结构等进行了观察和分析。结果表明:800H合金在sCO2中腐蚀1 000 h后,其质量增加了11.2 mg/dm2,腐蚀质量增加随时间的变化近似服从抛物线生长规律;表面氧化膜主要成分为Cr2O3,其结构致密且具有保护性;C元素沉积于氧化膜表面,富Al及富Si氧化物存在于氧化膜与基体交界处。
超临界二氧化碳
均匀腐蚀
800H alloy
supercritical carbon dioxide
general corrosion
Abstract
The general corrosion test of alloy 800H was carried out in a supercritical carbon dioxide (sCO2) environment at 650 ℃ and 20 MPa. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to observe and analyze the morphology, composition and structure of the oxide film on the sample surface. The results showed that the corrosion weight gain of the alloy 800H in the sCO2 was 11.2 mg/dm2 after 1 000 h of corrosion. The weight gain approximately followed a parabolic growth law with time. The oxide film on the surface was mainly composed of Cr2O3, which was dense and protective. Carbon was deposited on the surface of the oxide film, and Al-rich and Si-rich oxides were observed at the interface between the oxide film and the matrix.
中图分类号 TG172.9 DOI 10.11973/fsyfh-202311001
所属栏目 试验研究
基金项目 上海浦江人才计划项目(2020PJD022)
收稿日期 2021/12/1
修改稿日期
网络出版日期
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引用该论文: LIU Zhu,LONG Jiachen,SU Haozhan,GUO Xianglong,WANG Peng,LI Ling,ZHANG Lefu. General Corrosion Behavior of Alloy 800H in Supercritical Carbon Dioxide[J]. Corrosion & Protection, 2023, 44(11): 1
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【11】ROUILLARD F,MOINE G,TABARANT M,et al.Corrosion of 9Cr steel in CO2 at intermediate temperature II:mechanism of carburization[J].Oxidation of Metals,2012,77(1):57-70.
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