An investigation of the impacts of non-isothermal aging on the microstructures and corrosion of WE43 Mg alloy

The impacts of non-isothermal aging treatment (NIA) on the microstructure and corrosion resistance of WE43 magnesium alloy was examined through weight loss experiments, hydrogen evolution experiments, electrochemical assessments, three-dimensional microscopy, potential surface measurements, and micr...

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Bibliographic Details
Main Authors: Zhi Chen, Huizhong Li, Xiaopeng Liang, Hui Tao, Yixuan Che, Ming-Chun Zhao
Format: Article
Language:English
Published: Elsevier 2023-09-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785423022196
Description
Summary:The impacts of non-isothermal aging treatment (NIA) on the microstructure and corrosion resistance of WE43 magnesium alloy was examined through weight loss experiments, hydrogen evolution experiments, electrochemical assessments, three-dimensional microscopy, potential surface measurements, and microscopic analyses. The NIA modified the WE43 magnesium alloy by decreasing the precipitation-free zone (PFZ) and disrupting the continuous arrangement of precipitates along the grain boundaries. The Volta potential at the grain boundaries of NAI specimens (with respect to the matrix) was −35 mV, significantly lower than −110 mV in T6 specimens. Due to the effect of micro-galvanic corrosion between the grain boundaries and the grain interiors couple, T6 specimens exhibited significant grain boundary corrosion. They showed grooves with a maximum depth of about 13 μm and a width of about 30 μm after the immersion test. The NAI specimens have shallower grooves at the grain boundary. The corrosion rate of the three specimens was ranked as T4> T6> NAI.
ISSN:2238-7854