Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7969348 | Materials Characterization | 2018 | 13 Pages |
Abstract
Characteristics of the oxide film formed on stainless steel weld overlay cladding aged at 400â¯Â°C for different times in high temperature water were studied. The results showed that thermal aging showed no obvious effect on the volume fraction of ferrite phase but resulted in high corrosion susceptibility of the aged ferrite phase mainly. The oxide film formed on the unaged cladding material consisted of 100-nm-thick inner oxide layer (FeCr2O4 and Cr2O3) and Fe-rich outer oxide particles (Fe3O4) with a size of <500â¯nm. By comparison, 300-nm-thick Fe-Cr inner oxide layer (FeCr2O4, Cr2O3 and Fe3O4) and outer oxide particles (Fe3O4 and FeCr2O4) with a size of <700â¯nm formed on the aged ferrite phase. Spinodal decomposition was considered as the main factor to promote the corrosion of the aged ferrite phase, and existence of carbides along phase boundary facilitated corrosion of the cladding material in high temperature water.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Xinyuan Cao, Ping Zhu, Wei Wang, Tingguang Liu, Yonghao Lu, Tetsuo Shoji,