Investigating the effect of Cu-rich phase on the corrosion behavior of Super 304H austenitic stainless steel by TEM

•HAADF-STEM combined with EDS is applied to clarify the evolution of Cu-rich phase.•Tiny pits left by the dissolution of Cu-rich phase are bordered by a spinel FeCr2O4.•Solid-solution state Cu is enriched in the matrix immediately beneath the oxide film. The precipitation of a fine Cu-rich phase dis...

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Bibliographic Details
Published in:Corrosion science 2018-01, Vol.130, p.143-152
Main Authors: San, X.Y., Zhang, B., Wu, B., Wei, X.X., Oguzie, E.E., Ma, X.L.
Format: Article
Language:English
Subjects:
Atomic structure
Austenitic stainless steel
Austenitic stainless steels
Chemical precipitation
Copper
Corrosion
Corrosion effects
Cu-rich phase
Dissolution
Precipitates
Scale (corrosion)
Super 304H stainless steel
TEM
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Summary:•HAADF-STEM combined with EDS is applied to clarify the evolution of Cu-rich phase.•Tiny pits left by the dissolution of Cu-rich phase are bordered by a spinel FeCr2O4.•Solid-solution state Cu is enriched in the matrix immediately beneath the oxide film. The precipitation of a fine Cu-rich phase dispersedly distributed in the austenitic matrix can impart the novel properties of Super 304H SS. However, the contributions have not been well understood due to the difficulty encountered in obtaining precise experimental information on the corrosion events introduced by the nano-sized Cu-rich precipitates. In this work, we have applied TEM and clarified the dissolution occurred in Cu-rich phase and the dissolution-induced evolution in structure and chemistry on the surface. This work enabled us glean atomic scale insights on the effect of the Cu-rich phase on the corrosion behavior of the Super 304H SS.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2017.11.001