Study on microstructure of rare earth Mg-9%Gd-2%Y-3%Nd -0.7%Zr alloy and properties of micro-arc oxidation films

The micro-arc oxidation protective film has been prepared on the surface of Mg-9%Gd -2%Y-3%Nd-0.7%Zr alloy by using the microarc oxidation technique of “step by step depressurization”. The microstructure of magnesium alloy substrate and micro-arc oxidation film were measured by OM, SEM and XRD, and...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-06, Vol.2478 (12), p.122038
Main Authors: Yang, Xiaoyu, Qi, Guo, Tang, Shengming, Zhang, Lijun, Chen, Gang, Dong, Jiajing, Kai, Liu, Xu, Hengqiu, Duan, Xiuchao, Wang, Yongxu
Format: Article
Language:English
Subjects:
Corrosion resistance
Film thickness
Gadolinium
Grain boundaries
Magnesium base alloys
Microcracks
Microstructure
Morphology
Oxidation resistance
Physics
Precipitates
Pressure reduction
Substrates
Zirconium base alloys
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Summary:The micro-arc oxidation protective film has been prepared on the surface of Mg-9%Gd -2%Y-3%Nd-0.7%Zr alloy by using the microarc oxidation technique of “step by step depressurization”. The microstructure of magnesium alloy substrate and micro-arc oxidation film were measured by OM, SEM and XRD, and the properties of the film were evaluated by electrochemical test of film thickness and surface morphology. The results show that the discontinuous network multiple eutectic phases are distributed in the grain boundary and there are dispersed-granular precipitates in the alloy matrix. After the micro-arc oxidation treatment, the thickness and corrosion resistance of the micro-arc oxidation film increased with the increase of oxidation time, and the surface micropore size increased first and then decreased, and the surface morphology of the micro-arc oxidation film changed from no micro-crack to micro-crack, and finally the micro-crack disappeared.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2478/12/122038