Effects of the ratio of anodic and cathodic currents on the characteristics of micro-arc oxidation ceramic coatings on Al alloys

被引：110
作者：
Wang, Jun-Hua [1 ,2 ,3 ]
Du, Mao-Hua [1 ]
Han, Fu-Zhu [2 ,3 ]
Yang, Jing [4 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Mech & Elect Engn, Kunming 650500, Peoples R China
[2] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
[3] Beijing Key Lab Precis Ultraprecis Mfg Equipments, Beijing 100084, Peoples R China
[4] Beijing Univ Posts & Telecommun, Beijing 100876, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2014年 / 292卷
关键词：
Micro-arc oxidation; Al alloys; Cathodic current; Anodic current; Ceramic coatings; PLASMA ELECTROLYTIC OXIDATION; ALUMINUM-ALLOY; PHASE-COMPOSITION; MORPHOLOGY; BEHAVIOR;
D O I：
10.1016/j.apsusc.2013.12.028
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The micro-arc oxidation (MAO) has increasingly gained attention as a novel and unique technique for depositing thick, dense, and ultra-hard ceramic coatings on aluminum and its alloys substrates. For the MAO technology, discharge parameter, especially the cathodic current, has an important effect on the characteristics of ceramic coatings. But the effects of the ratio of anodic and cathodic currents on properties of the ceramic coatings on Al alloys are rarely studied. This work investigates the effects of the ratio of anodic and cathodic currents under the constant current density on morphology, phase composition, microstructure, and properties of ceramic coatings on 6061 Al alloys. It is found that the ceramic coatings surface roughness Ra is decreasing, and the hardness of ceramic coatings is increasing with the decrease of the ratio. The ceramic coatings are mainly composed of a large amount of alpha-Al2O3 and gamma-Al2O3. The content of alpha-Al2O3 in the ceramic coatings increases with the decrease of the ratio. (C) 2013 Elsevier B.V. All rights reserved.
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页码：658 / 664
页数：7
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