Effects of KMnO4 on microstructure and corrosion resistance of microarc oxidation coatings on 2024 aluminum alloy

被引：11
作者：
Yang Wei [1 ]
Jiang Bai-ling [1 ]
Shi Hui-ying [1 ]
Xian Lin-yun [1 ]
机构：
[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China
来源：
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2010年 / 17卷 / 02期
关键词：
2024 aluminum alloy; KMnO4; microarc oxidation; microstructure; corrosion resistance; CERAMIC COATINGS; MAGNESIUM ALLOY; PLASMA ELECTROLYSIS; WEAR-RESISTANCE; ARC OXIDATION; MECHANISM; BEHAVIOR; HARD;
D O I：
10.1007/s11771-010-0034-2
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Microarc oxidation (MAO) coatings were prepared on 2024 aluminum alloy in a Na2SiO3-KOH electrolyte with KMnO4 addition varying from 0 to 4 g/L. The microstructure and phases of the coatings were characterized by scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively. The corrosion resistance of MAO coatings was evaluated by electrochemical potentiodynamic polarization in 5% (mass fraction) NaCl solution. The results show that when KMnO4 is added into base electrolyte, the growth speed of oxide coatings is increased obviously. The main phase of oxide coatings is Al2O3, and the contents of MnO2 and Mn2AlO4 phases are increased at the top of oxide coatings with increasing the concentration of KMnO4. The solute elements participate in forming the oxide coatings. When a proper concentration of KMnO4 (2.5 g/L) is added into the base solution, the micropores of the MAO coatings are small and compact, and the corrosion resistance of oxide coatings is increased largely.
引用
收藏
页码：223 / 227
页数：5
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