Sulphur diffusion through a growing chromia scale and effects of water vapour

被引：6
|
作者：
Sha, Chuhan [1 ]
Yang, Limei [2 ,3 ]
Cairney, Julie M. [2 ,4 ]
Zhang, Jianqiang [1 ]
Young, David J. [1 ]
机构：
[1] Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
[2] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
[3] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
[4] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Camperdown, Australia
来源：
CORROSION SCIENCE | 2023年 / 222卷
基金：
澳大利亚研究理事会;
关键词：
Chromia; Sulphur; Water vapour; Grain boundaries; High temperature corrosion; FE-CR ALLOYS; HIGH-TEMPERATURE CORROSION; OXIDATION BEHAVIOR; GRAIN-BOUNDARIES; ATMOSPHERES; SEGREGATION; SULFIDATION; GROWTH; SYSTEM; CR2O3;
D O I：
10.1016/j.corsci.2023.111410
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fe-30Cr (wt%) alloy was exposed to Ar-0.5%SO2 and Ar-10%H2O-0.5%SO2 gases at 650 degrees C, forming Cr2O3 scales. In dry SO2 for 20 h, sulphur enrichment and scattered Cr-sulphides were observed at the scale-alloy interface, together with internal Cr-sulphide precipitates. After 100 h, sulphur disappeared from the interface, while more internal Cr-sulphides were produced. In wet SO2, the sulphur enrichment and Cr-sulphides were maintained in both times, but no internal sulphidation was seen. Atom probe analysis revealed sulphur enrichment on chromia grain boundaries in both gases, to a greater extent in wet SO2. These effects are discussed in terms of chromia grain boundary diffusion.
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页数：15
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