CO_(2) High Temperature Corrosion and Its Prevention of Chromia Forming Fe-base Alloys  

作　　者：张建强 Jian-qiang ZHANG(School of Materials Science&Engineering,University of New South Wales,Sydney NSW2052,Australia)

机构地区：[1]School of Materials Science&Engineering,University of New South Wales,Sydney NSW2052,Australia

出　　处：《表面技术》2021年第4期260-266,共7页Surface Technology

摘　　要：High temperature corrosion of chromia forming Fe-base alloys by CO_(2) produces not only oxidation but also carburisation.The corrosion kinetics in CO_(2)-rich gas is found to be increased compared with that in air or oxygen.As a result,higher alloy chromium levels are required to achieve protective chromia formation in CO_(2).Corrosion reaction mechanisms in CO_(2) are examined and the internal carburisation of alloys in low carbon activity CO_(2) gases are analysed based on the variation of pO_(2) at the interface of oxide and metal.Carbon penetration through chromia oxide scale has been revealed by atom probe tomography.The strategies to resist CO_(2) corrosion are reviewed by alloying of Si and/or Mn,forming additional diffusion barrier layers,and by adding sulphur to modify oxide grain boundaries to reduce carbon diffusion along the grain boundaries.

关 键 词：high temperature corrosion CO_(2) chromia-forming alloys carburisation ALLOYING 

分 类 号：TG172[金属学及工艺—金属表面处理]