Enhancing corrosion resistance and microstructure of the PEO coating layer on 6061 aluminium alloy: The role of first step voltage in plasma electrolytic oxidation

被引：7
|
作者：
Oh, G. H. [1 ,2 ]
Yoon, J. K. [1 ]
Huh, J. Y. [2 ]
Doh, J. M. [1 ]
机构：
[1] Korea Inst Sci & Technol, Mat Architecturing Res Ctr, Seoul 02792, South Korea
[2] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea
来源：
CORROSION SCIENCE | 2024年 / 233卷
关键词：
Plasma Electrolytic Oxidation; Al alloys; Corrosion resistance; Defects; Voltage; CU-LI ALLOY; MICROARC OXIDATION; CERAMIC COATINGS; AL-ALLOY; OXIDE-LAYERS; IMPEDANCE SPECTROSCOPY; DIELECTRIC-PROPERTIES; AA7075; ALUMINUM; GROWTH-BEHAVIOR; FILM THICKNESS;
D O I：
10.1016/j.corsci.2024.112123
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, a novel two-step hybrid PEO technique was used to produce an alumina(Al2O3) on an Al6061 alloy. The research emphasizes the influence of the microstructure of the initial thin layer on the amount of defects such as microcracks and micropores in the final coating. Initially, a thin alumina layer was formed at 400 similar to 600 V using a pulsed unipolar mode, followed by a thicker layer at 500 V using a pulsed bipolar mode. The results indicate that a sound PEO coating with fewer defects markedly enhances the corrosion resistance of the Al6061 alloy.
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页数：17
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