A large number of studies of corroded samples were conducted using SEM, XPS, probe, and the TEM. Samples from the DELTA loop at LANL and from other sources were examined. Also, the investigation of 316 class stainless steel in LBE is continuing.
Corroded samples of D-9 steel have been in the process of being studies, which is a variant of 316 stainless steel that is optimized for resistance to swelling. The D-9 samples are notable for the process in which a localized failure of the protective oxide layer becomes widespread corrosion. The research group is examining the D-9 samples using a variety of surface microscopic techniques. A summary of the D-9 results was presented by Allen Johnson in March to the annual meeting of the AFCI research, and a detailed manuscript is in preparation for submission to the Journal of Nuclear Materials.
Raman spectroscopy reveals the vibrational frequencies of samples, and has the advantages of smaller spot size (down to ~1 micron) and convenient access to the lower frequency vibrations expected in inorganic materials. For example, wustite (FeO), hematite (Fe2O3) and magnetite (Fe3O4) are all iron oxides with Fe/O ratios near 1:1, but they have different vibrational frequencies.
Corrosion and anti-corrosives; Eutectic alloys; Lead-bismuth alloys; Metals—Cold working; Nuclear reactors — Materials — Testing; Steel — Corrosion
Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy
Johnson, A. L.,
Corrosion Mechanisms and Kinetics of Steels in Lead-Bismuth Eutectic: Quaterly Report.
Available at: https://digitalscholarship.unlv.edu/hrc_trp_sciences_materials/123