Gradient textures induce micro-galvanic corrosion on Mg
In this study, the reason for the non-basal-plane-rich area more corrosion resistant than the basal-plane area on pure Mg in NaCl electrolyte was demonstrated based on quasi-in-situ EBSD observations. Due to the higher concentration of dissimilar crystallography orientations in the basal-plane-rich...
Saved in:
Published in | Journal of alloys and compounds Vol. 1005; p. 176119 |
---|---|
Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.11.2024
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | In this study, the reason for the non-basal-plane-rich area more corrosion resistant than the basal-plane area on pure Mg in NaCl electrolyte was demonstrated based on quasi-in-situ EBSD observations. Due to the higher concentration of dissimilar crystallography orientations in the basal-plane-rich area, the gradient textures and ‘micro-texture’ galvanic couples were promoted. This exacerbates the progression of localized corrosion in basal-plane-rich area, ultimately deteriorating the overall corrosion performance of Mg. Randomizing the gradient texture diminishes the tendency towards micro-galvanic corrosion and enhances the corrosion resistance of Mg. These findings shed light on yet another facet of complex mechanism of Mg corrosion.
•Quasi-in-situ EBSD observations were used to investigate the influence of texture on Mg corrosion.•The reason for higher corrosion resistance of non-basal-plane-rich area than basal-plane-rich area in Mg was identified.•A ‘micro-texture’ galvanic corrosion mechanism induced by gradient textures was proposed and rationalized.•The model elucidating localized corrosion mechanism affected by texture were established. |
---|---|
ISSN: | 0925-8388 |
DOI: | 10.1016/j.jallcom.2024.176119 |