Influence of CO2 purity on the oxidation of a 12Cr ferritic-martensitic steel at 550°C and importance of the initial stage

被引:16
作者
Bouhieda, Soraya [1 ,2 ]
Rouillard, Fabien [1 ]
Wolski, Krzysztof [2 ]
机构
[1] CEA, DEN, DPC, SCCME,Lab Etud Corros Non Aqueuse, F-91191 Gif Sur Yvette, France
[2] Ecole Mines St Etienne, Lab Claude Goux, UMR 5146, CNRS,Ctr SMS, F-42023 St Etienne, France
关键词
Brayton cycle; carbon dioxide; heat exchanger; ferritic-martensitic steel; 12Cr steel; oxidation; oxygen; BI EUTECTIC ALLOY; FE-9CR-1MO STEEL; MECHANISM;
D O I
10.3184/096034012X13323581167078
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
It has been shown that ferritic-martensitic (F/M) steels with 12 wt% Cr can form a protective oxide layer depending on the CO2 purity from the first stages of oxidation. The impurities which could explain this difference could be O-2. In the case where O-2 concentration in the gas phase was significant (>ppm), a thick duplex oxide layer was observed, whereas, if the O-2 concentration was low (<ppm), a Cr rich oxide layer about hundred times thinner was formed. These results strongly suggested that O-2 reacted before CO2 on the steel surface and that the protective oxide layer was formed by reactions between chromium and O-2.
引用
收藏
页码:151 / 158
页数:8
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