Improving the Corrosion Resistance of AZ91 Magnesium Alloy by Surface Coating TiO2 Layers

This study adopts the sol-gel method to prepare a TiO2 coating on the surface of the AZ91 magnesium alloy, hydrolyse C16H36O4Ti to generate the TiO2 coating and form a film with excellent corrosion resistance on the surface of an AZ91 magnesium alloy. The composition, surface structure and microstru...

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Bibliographic Details
Published in:Metals (Basel ) 2023-08, Vol.13 (8), p.1400
Main Authors: Wan, Diqing, Tang, Hao, Sun, Yumeng, Zeng, Guilin, Dong, Shaoyun, Han, Guoliang, Wang, Yu, Yang, Fan, Wang, Yongyong
Format: Article
Language:English
Subjects:
AZ91 magnesium alloy
coating design
Corrosion resistance
Ethanol
Heat
Heat treatment
Hydrochloric acid
Hydrogen
Hydrogen evolution
Magnesium alloys
Magnesium base alloys
Nanoparticles
Protective coatings
Sol-gel processes
Sols
Surface structure
Thin film coatings
TiO2 film
Titanium
Titanium dioxide
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Summary:This study adopts the sol-gel method to prepare a TiO2 coating on the surface of the AZ91 magnesium alloy, hydrolyse C16H36O4Ti to generate the TiO2 coating and form a film with excellent corrosion resistance on the surface of an AZ91 magnesium alloy. The composition, surface structure and microstructure of the TiO2 coatings are characterised via X-ray diffraction (XRD) and scanning electron microscopy. The corrosion performance of the surface coatings was investigated through hydrogen evolution experiments and electrochemical tests. The results demonstrate that TiO2 sols prepared from a mixture of hydrochloric acid, deionised water, C16H36O4Ti and anhydrous ethanol can form stable layers on the surface of an AZ91 magnesium alloy after heat treatment. The results of hydrogen evolution experiments and electrochemical tests reveal that the TiO2 coating can effectively improve the corrosion resistance of the AZ91 magnesium alloy.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13081400