期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 273, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.125121
关键词
Crystallographic orientation; Texture; Rolled magnesium alloy; Conversion coating; Corrosion resistance
资金
- National Natural Science Foundation of China [51771050, 51531007]
- China Postdoctoral Science Foundation [2019M651128]
- Shanghai Aerospace Science and Technology Innovation Fund [SAST2020-046]
The microstructure and corrosion resistance of phosphate conversion coatings on different surfaces of rolled AZ31 magnesium alloy vary due to differences in grain orientation. The electrochemical reactivity and nucleation rate play a key role in influencing the compactness and corrosion resistance of the coatings.
In this work, the microstructure and corrosion resistance of phosphate conversion coatings on the cross-sectional surface (CS), the rolled surface (RS) and the slanted surface (SS) of rolled AZ31 magnesium alloy were compared. Results demonstrate that most grains on the rolled surface (RS) conform (0001) orientation, which renders a lowest electrochemical reactivity; while the cross-sectional surface (CS) and the slanted surface (SS) exhibited a preferential orientation of (0110) and (1210), which renders a higher electrochemical reactivity. The variation of electrochemical reactivity affects the nucleation rate of crystals, thus altering the compactness and corrosion resistance of phosphate conversion coating on different surfaces. The conversion coating on the RS exhibits the worst corrosion resistance.
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