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

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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-Al₂O₃phases, in which the content of γ-Al₂O₃phase 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.

Key words： 5052 aluminum alloy micro-arc oxidation oxidation film film structure corrosion resistance

Received: 25 March 2018 Published: 12 July 2019

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	Articles by authors
	FANG Lei
	MA Yunzhu
	LIU Wensheng
	LIU Yang
	LIU Chao
	YAN Huanyuan

Cite this article:

FANG Lei,MA Yunzhu,LIU Wensheng, et al. Effects of oxidation time on microstructure and corrosion resistance of micro-arc oxidation film on aluminum alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 503-510.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/503

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