Tribological and corrosion resistance properties of graphite composite coating on AZ31 Mg alloy surface produced by plasma electrolytic oxidation

Ceramic coatings have been successfully fabricated on the surface of Magnesium alloys (AZ31D) by plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte with and without the addition of graphite. The influence of graphite on the surface morphology, microstructure, phase composition,...

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Bibliographic Details
Published inSurface & coatings technology Vol. 359; pp. 197 - 205
Main Authors Peitao, Guo, Mingyang, Tang, Chaoyang, Zhang
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.02.2019
Elsevier BV
Subjects
Ceramic coatings
Ceramic glazes
Ceramics
Chemical composition
Coating
Corrosion resistance
Graphene
Graphite
Magnesium alloys
Magnesium base alloys
Morphology
Organic chemistry
Oxidation
Phase composition
Photoelectrons
Plasma electrolytic oxidation
Protective coatings
Scanning electron microscopy
Tribological property
Tribology
X ray photoelectron spectroscopy
X-ray diffraction
Corrosion resistance
Tribological property
Coating
Plasma electrolytic oxidation
Magnesium alloys
Graphite
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Summary:Ceramic coatings have been successfully fabricated on the surface of Magnesium alloys (AZ31D) by plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte with and without the addition of graphite. The influence of graphite on the surface morphology, microstructure, phase composition, chemical composition, corrosion resistance, and tribological behavior of ceramic coatings was scrutinized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), potentiodynamic polarization, MFT-4000 multifunctional material surface performance instrument. The ceramic coating with the addition of graphene exhibits better corrosion resistance and tribological performance. •Graphite elements were distributed uniformly in the PEO coating and did not react with other elements during PEO.•The addition of many graphite particles into the PEO coating can decrease the average COF.•The addition of less graphite particles can improve the corrosion resistance of the coatings.•The graphite connected on the coating surface can form a capacitive structure with the matrix coating.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.12.073