Effect of Titanium Nanoparticles in
Electrolyte on the Properties of Micro-Arc
Oxidation Coatings on AZ91D Magnesium Alloy Surface

BIAN Hao, LIANG Jun, PENG Zhen-jun, ZHOU Jian-song

doi:10.16577/j.issn.1001-1560.2023.0077

2023 , Vol. 56 >Issue 4: 1 - 9

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0077

Effect of Titanium Nanoparticles in Electrolyte on the Properties of Micro-Arc Oxidation Coatings on AZ91D Magnesium Alloy Surface

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(1.Key Laboratory of Science and Technology on Wear and Protection of Materials，Lanzhou Institute of Chemical Physics，Chinese Academy of Sciences，Lanzhou 730000，China；2.Center of Materials Science and Optoelectronics Engineering，University of Chinese Academy of Sciences，Beijing 100049，China)

Received date: 2022-09-20

Revised date: 2022-10-05

Accepted date: 2022-10-13

Online published: 2023-07-25

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Abstract

MAO coatings were prepared on AZ91D magnesium alloy surface in the phosphate electrolyte containing different concentrations of titanium nanoparticles.The effects of titanium nanoparticle concentration on the morphology,composition and properties of the as-prepared coatings were studied.Scanning electron microscope,energy dispersive spectrometer,X-ray diffractometer and X-ray photoelectron spectroscopy were employed to characterize the morphology and composition of such coatings.The corrosion resistance of coatings was tested by an electrochemical workstation,and the light absorption performance of the coatings was evaluated by a spectrophotometer.Results showed that the added titanium nanoparticles in electrolyte had little influence on voltage variation.However,the titanium nanoparticles in electrolyte could form Mg₂TiO₄in the micro-arc oxidation coatings.With the increase of the concentration of titanium nanoparticles,the small micropores on the surface of the coatings decreased first and then increased,so the corrosion resistance increased first and then decreased;furthermore,the coating's color changed from gray to light blue and then dark blue,leading to a gradual decrease of the reflectivity to simulated sunlight

Key words： micro-arc oxidation coating; titanium nanoparticle; AZ91D magnesium alloy; corrosion resistance; reflectance

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BIAN Hao, LIANG Jun, PENG Zhen-jun, ZHOU Jian-song .

Effect of Titanium Nanoparticles in Electrolyte on the Properties of Micro-Arc Oxidation Coatings on AZ91D Magnesium Alloy Surface

[J]. Materials Protection, 2023 , 56(4) : 1 -9 . DOI: 10.16577/j.issn.1001-1560.2023.0077

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