Improved corrosion resistance of MAO coating on Mg-Li alloy by RGO modified silanization

Improved corrosion resistance of MAO coating on Mg-Li alloy by RGO modified silanization

The inherent micropores and microcracks in the micro-arc oxidation (MAO) film on the surface of Mg-Li alloy limit the corrosion resistance of the film in corrosive environments. In this work, the double-layer micro-arc oxidation/3-glycidoxypropyltrimethoxysilane (KH560) composite film was prepared o...

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Bibliographic Details
Published in:Journal of alloys and compounds Vol. 929; p. 167283
Main Authors: Huang, Jianfeng, Dun, Yuchao, Wan, Quanyi, Wu, Zirui, Zhao, Xuhui, Tang, Yuming, Zhang, Xiaofeng, Zuo, Yu
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 25-12-2022
Elsevier BV
Subjects:
Corrosion resistance
Corrosion resistant alloys
Graphene
Magnesium base alloys
Mg-Li alloy
Micro-arc oxidation
Microcracks
Oxidation
Protective coatings
Reduced graphene oxide
Silanization
Thickness
Corrosion resistance
Mg-Li alloy
Silanization
Reduced graphene oxide
Micro-arc oxidation
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Summary:The inherent micropores and microcracks in the micro-arc oxidation (MAO) film on the surface of Mg-Li alloy limit the corrosion resistance of the film in corrosive environments. In this work, the double-layer micro-arc oxidation/3-glycidoxypropyltrimethoxysilane (KH560) composite film was prepared on the surface of the LA103Z Mg-Li alloy by MAO and silanization treatments. Based on this, the modification with reduced graphene oxide (RGO) to the KH560 film was studied and the corrosion resistance of the film was investigated. The results show that the silane film prepared is uniform and complete which fills up the micropores and microcracks of the MAO film, enhancing the shielding effect of the film. Moreover, the RGO modification increases the thickness of the KH560 film and the corrosion resistance of the composite film significantly in 3.5 wt% NaCl solution. •The silane film fills up the micropores and microcracks of the MAO film, enhancing the shielding effect of the film.•The RGO increases the thickness of the KH560 film and the corrosion resistance of the composite film significantly.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.167283