[Introduction]The effect of oxidation time on micro-arc oxidation(MAO)film of silicon carbide particle reinforced aluminum matrix(SiCp/Al)composite was studied.[Method]The micro-arc oxidation of SiCp/Al composite was carried out in an aluminate electrolyte.The effect of oxidation time on microstructure,phase constitution,thickness,roughness,adhesion strength,electrical insulating property,and corrosion resistance of SiCp/Al composite was discussed.[Result]With the extending of oxidation time,the MAO film gradually became continuous,uniform,and thick.Excessively long oxidation time led to a lamination structure,accompanied by the formation of large-sized micropores and cracks,and low growth rate of the MAO film.The adhesion strength of the MAO film was increased initially and then decreased,and reached the maximum value of 39.85 N at 60 min.The MAO film prepared by oxidation for 10 min had the best electrical insulation and anticorrosion performance.Its insulation resistance was 3.11×1012 Ω at 100 V and 1.41×1012 Ω at 500 V,and its corrosion potential and corrosion current density were-0.629 8 V and 1.332×10-7 A/cm2,respectively.[Conclusion]The continuity,uniformity,and growth rate of the MAO film on SiCp/Al composite are related to the oxidation time.It is necessary to select the appropriate oxidation time to prepare continuous and uniform MAO films with excellent comprehensive properties.
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