Hydrogen- and Corrosion-Related Defect Characterization of Iron and Steels Using a Slow Positron Beam

Abstract:

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.

• Periodical: Materials Science Forum (Volume 607)
• Pages: 111-113
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.607.111
• Online since: November 2008
• Authors: Yi Chu Wu, C.Q. Chen, Y.Q. Chen, Y. Hu, J. Cheng, Shao Jie Wang, Yan Ching Jean
• Keywords: Corrosion, Defect, Hydrogen, Positron Annihilation, Steel

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