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Effect of current density on physical and chemical properties of microarc oxidation coatings of aluminium alloy

Bai Yi-Zhen Wang Jian-Bo Lü Xian-Yi Long Bei-Hong Jin Zeng-Sun Long Bei-Yu Bi Dong-Mei Wu Han-Hua

Effect of current density on physical and chemical properties of microarc oxidation coatings of aluminium alloy

Bai Yi-Zhen, Wang Jian-Bo, Lü Xian-Yi, Long Bei-Hong, Jin Zeng-Sun, Long Bei-Yu, Bi Dong-Mei, Wu Han-Hua
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  • Received Date:  24 March 2005
  • Accepted Date:  18 July 2005
  • Published Online:  20 December 2005

Effect of current density on physical and chemical properties of microarc oxidation coatings of aluminium alloy

  • 1. (1)大连理工大学物理系,三束材料改性国家重点实验室,大连 116024; (2)吉林大学超硬材料国家重点实验室,长春 130012; (3)吉林大学物理学院,长春 130023; (4)吉林大学物理学院,长春 130023;吉林大学超硬材料国家重点实验室,长春 130012

Abstract: Ultra-hard ceramic coatings with microhardness of 42.14GPa have been synthesized on the Al alloy substrate by microarc oxidation (MAO) technique. The effects of anodic current density ja and the ratio of cathodic to anodic current density jc/ja on the mechanical property and phase composition of MAO coatings have been studied by microhardness test and x-ray diffraction, respectively. In addition, the microstructure and corrosion resistance of the coatings were analyzed by scanning electron microscopy and pitting corrosion test, respectively. The results show that the samples prepared at high anodic current density consist mainly of α-Al2O3, while the samples fabricated at low anodic current density are composed almost entirely of γ-Al2O3. Microhardness test shows that these kinds of samples have high hardness, and the microhardness of the coating prepared at ja=15A/dm2 and jc/ja=0.7 is t highest of all coatings prepared. Pitting corrosion test shows that the structure of coatings is strongly influenced by the variation in jc/ja.

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