Effect of Lead-Bismuth Eutectic Oxygen Concentration on the Onset of Dissolution Corrosion in 316 L Austenitic Stainless Steel at 450 C

Oksana Klok, Konstantina Lambrinou, Serguei Gavrilov, Jun Lim, Iris De Graeve

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3 Citations (Scopus)

Abstract

This work focuses on the effect of dissolved oxygen concentration in liquid lead-bismuth eutectic (LBE) on the onset of dissolution corrosion in a solution-annealed 316 L austenitic stainless steel. Specimens made of the same 316 L stainless steel heat were exposed for 1000 h at 450 C to static liquid LBE with controlled concentrations of dissolved oxygen, i.e., 105, 106, and 107 mass%. The corroded 316 L steel specimens were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). A complete absence of dissolution corrosion was observed in the steel specimens exposed to liquid LBE with 105 and 106 mass% oxygen. In the same specimens, isolated “islands” of FeCr-containing oxides were also detected, indicating the localized onset of oxidation corrosion under these exposure conditions. On the other hand, dissolution corrosion with a maximum depth of 59 lm was detected in the steel specimen exposed to liquid LBE with 107 mass% oxygen. This suggests that the threshold oxygen concentration associated with the onset of dissolution corrosion in this 316 L steel heat lies between 106 and 107 mass% oxygen for the specific exposure conditions (i.e., 1000 h, 450 C, static liquid LBE).

Original languageEnglish
Article number031019
Pages (from-to)1-7
Number of pages7
JournalJournal of Nuclear Engineering and Radiation Science
Volume4
Issue number3
Early online date16 May 2018
DOIs
Publication statusPublished - 1 Jul 2018
Externally publishedYes

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