Hydrogen- and corrosion-related defect characterization of iron and steels using a slow positron beam
Hydrogen-and corrosion -related defects of pure iron and AISI 304 and 316 stainless steels were investigated by measuring Doppler broadening energy spectra of positron annihilation. The significant increase in S-parameter after corrosion in iron was interpreted as due to the formation of defects and voids during corrosion processes. However, a decrease of the S-parameter in AISI 304 and 316 stainless steels after corrosion was interpreted as dissolution of passivity oxide film. Furthermore, similar results in iron and stainless steels after hydrogen-charging were observed. Hydrogen damage between the surface and the bulk has a significant variation with depth. The larger increase in S-parameter near the surface after hydrogen-charging mainly comes from the formation of large-size defects (e.g. voids); however the increase in S-parameter in the bulk after hydrogen-charging mainly comes from the production of small-size defects.
positron annihilation hydrogen corrosion defect steel
Y.C.Wu C.Q.Chen Y.Q.Chen Y.Hu J.Cheng S.J.Wang Y.C.Jean
Department of Physics,Wuhan University,Wuhan 430072,China Departments of Chemistry and Physics,University of Missouri-Kansas City,5009 Rockhill Road,Kansas Ci
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
111-113
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）