Abstract：Micro-arc oxidation (MAO) films were fabricated on 5052 aluminum alloy by micro-arc oxidation in silicate system (Na2SiO3+KOH) solution. The morphology, elemental distribution and phase composition of MAO films were analyzed by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).The effects of oxidation time on the film thickness, surface porosity, the maximum hole diameter and the corrosion resistance of the film were analyzed emphatically. The results show that the surface of the micro-arc oxidation film has “volcano deposit” morphology, and the film thickness, surface porosity and pore diameter increase with increasing oxidation time. The film mainly with O and Al elements, is composed of γ-Al2O3 and α-Al2O3 phases, in which the content of γ-Al2O3 phase is higher. The corrosion resistance of MAO treated sample is obviously improved, the corrosion current density is decreased by at least two order of degree magnitude, and the electrochemical impedance modulus |Z| is increased at least two order of degree magnitude. With the oxidation time increasing from 10 min to 50 min, the corrosion resistance of the sample first increases and then decreases. When the oxidation time is 20 min, the sample shows the best corrosion resistance.
方雷, 马运柱, 刘文胜, 刘阳, 刘超, 颜焕元. 氧化时间对铝合金微弧氧化膜层结构及耐腐蚀性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(5): 503-510.
FANG Lei, MA Yunzhu, LIU Wensheng, LIU Yang, LIU Chao, YAN Huanyuan. Effects of oxidation time on microstructure and corrosion resistance of micro-arc oxidation film on aluminum alloy. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 503-510.
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2018, Vol. 23 
