Abstract
The interaction effect of micro arc oxidation (MAO) parameters on the microstructure and wear properties was investigated. The results showed that the electric current and oxidation time significantly influenced the thickness and grinding crack width of the ceramic coatings within the range of the selected parameters, and the interaction effect of the electrical parameters was not obvious. The surface morphology, cross-section morphology, and element distribution of the coatings were observed using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that ceramic coatings with γ-Al2O3 and α-Al2O3 formed, which enhanced the coating performance. After that, the microhardness and wear resistance were tested. Under the optimal process, the microhardness of a coating section was up to 1200 HV0.1, and the friction coefficient was just 0.3. When wear occurred, the volcanic microstructures experienced extrusion and deformation, and then peeled off under shear stress, which led to the formation of a grinding crack. The main failure modes of the micro arc oxidation coatings were abrasive wear and spalling failure.
Highlights
Micro arc oxidation (MAO) as a novel technique has been widely used to deposit ceramic coatings on metal surfaces [1,2]
Ceramic coatings were prepared on Al foil using the micro arc oxidation
Ceramic coatings were prepared on Al foil using the micro arc oxidation method
Summary
Micro arc oxidation (MAO) as a novel technique has been widely used to deposit ceramic coatings on metal surfaces [1,2]. A lot of researchers have focused on the effects of electrolyte and electrical parameters on the microstructure and properties of coatings. V.S. Rudnev [10] studied the effect of borate and silicate aqueous electrolytes on wear resistant oxide coatings. Rudnev [10] studied the effect of borate and silicate aqueous electrolytes on wear resistant oxide coatings Electrical parameters, such as the electrical current, power frequency, duty cycle, and oxidation time, play an important role in ceramic coating generation. Analyzed the effect of the deposition time on the structure and anti-corrosion properties of micro arc oxidation coatings. The interaction effect of the electric current, power frequency, duty cycle, and oxidation time on the microstructure and the wear properties of the ceramic coatings were investigated by orthogonal experiment design. The microstructure, microhardness, and wear resistance were tested, and the corresponding relationships among them were analyzed
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