Hydrogen-and corrosion-related defect characterization of iron and steels using a slow positron beam

摘要：

Hydrogen-and corrosion -related defects of pure iron and AISI 304 and 316 stainless steels were investigated by measuring Doppler broadening energy spectra (DBES) of positron annihilation and positron lifetime. Defect profiles of the S-parameter from DBES as a function of positron incident energy up to 25 keV (i.e.～1 μm depth) were analysed. When the sample is treated with various potentials in 1N H2SO4 solution at room temperature, significant changes of S-parameter are observed. Under anodic polarization, an increase in the S-parameter in pure iron is observed. This corrosion process is interpreted as the presence of defects and voids of a few nanometers near the surface.

作者: Y.C.Wu C.Q.Chen Y.Q.Chen Y.Hu J.Cheng S.J.Wang Y.C.Jean

作者单位: Department of Physics,Wuhan University,Wuhan 430072,China Departments of Chemistry and Physics,University of Missouri-Kansas City,5009 Rockhill Road,Kansas Ci

会议类型: 国际会议

会议名称: 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)

会议地点: 武汉

会议语种:英文

页码: 96

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）