Synergistic Effect of Solid State Hydrogen and Cold Work Pretreatment on Oxide Films Grown on 316L Stainless Steel during Short Term Immersion in Deaerated High Temperature Water at 300 °C

Jiarong Ma,Xinhe Xu,Tongming Cui,Yuanjie Tang,Sergio Lozano-Perez,Tetsuo Shoji,Zhanpeng Lu,Kun Zhang

doi:10.1149/1945-7111/abc728

Abstract

The properties of the oxide films formed on solution-annealed and cold-worked 316L stainless steel (SS) specimens with and without charged hydrogen in deaerated pressurized water reactor primary water at 300 °C were investigated. The outer oxide layers of all specimens were composed of magnetite (Fe3O4) and NiFe2O4. Charged hydrogen resulted in larger outer iron-bearing oxide particles forming due to hydrogen-enhanced outward diffusion of iron cations. Prior cold-work accelerates the oxidation was observed. Charged hydrogen led to local cracks in the oxide film and enhanced the penetration oxidation beneath the metal/oxide interface. The Cr-rich inner oxide layer grown on the prior cold-worked specimen with charged hydrogen was thicker than that on the cold-work specimen or the hydrogen-charged specimen, revealing the combined effects of charged hydrogen and prior cold-work on the acceleration of the oxidation process. The working mechanism of the solid-state hydrogen effect on the oxide film was discussed.

Highlights

Synergistic Effect of Solid State Hydrogen and Cold Work Pretreatment on Oxide Films Grown on 316L Stainless Steel during Short Term Immersion in Deaerated High Temperature Water at 300 °C
Pressurized water reactor (PWR) primary circuit water contains a certain amount of dissolved hydrogen (DH), which has been applied to restrain water radiolysis and maintain a relatively low electrochemical corrosion potential
Oxidation behavior of solutionannealed 316L (SA316L).— Properties of oxide films formed on SA316L after exposure for 72 h.—Figure 4 shows the scanning electron microscope (SEM) morphologies of oxide films formed on 316-72N and 316-72H specimens after being exposed to deaerated PWR primary water at 300 °C for 72 h

Summary

Introduction

Synergistic Effect of Solid State Hydrogen and Cold Work Pretreatment on Oxide Films Grown on 316L Stainless Steel during Short Term Immersion in Deaerated High Temperature Water at 300 °C.

Results

Conclusion