Insulation Treatment of 2A12 Aluminum Alloy Surface by Plasma Electrochemical Oxidation


Article Preview

The 2A12 aluminum alloy surface is treated by plasma electrochemical oxidation (PEO) in alkaline solution. X-ray Diffraction (XRD) is used to analyze the phases of PEO coatings. Scanning Electron Micrograph (SEM) is used to investigate the compactness of PEO coatings. High resistance meter and voltage resistance meter are used to measured Electric resistance and breakdown field strength of PEO coatings respectively. The results show that the PEO coating is composed of α-Al2O3, γ-Al2O3 , etc, and they are all well-insulated substance which is profitable to insulation of 2A12 aluminum alloy. When the thickness of PEO is more than 60μm, porosity in the PEO coating is estimated not more than 15%. Electric resistivity of PEO coatings can reach as high as 1013 Ω·cm, and breakdown field strength of the PEO coatings can reach 72 V / μm.



Edited by:

Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou




M. Liu et al., "Insulation Treatment of 2A12 Aluminum Alloy Surface by Plasma Electrochemical Oxidation", Materials Science Forum, Vol. 687, pp. 297-302, 2011

Online since:

June 2011




[1] Monfort. F, Berkani. A, Matykina. E, Skeldon. P, Thompson. G.E., Habazaki. H, Shimizu. K. Development of anodic coatings on aluminum under sparking conditions in silicate electrolyte. Corrosion science2007; 49: 672-693.


[2] Butyagin. P.I., Khokhryakov. Ye.V., Mamaev. A.I. Micro plasma systems for creating coatings on aluminum alloys. Materials letters 2003; 57: 1748-1751.


[3] Matykina. E, Arrabal. R, Monfort. F, Skeldon. P, Thompson. G.E. Incorporation of zirconia into coatings formed by DC plasma electrolytic oxidation of aluminum in nanoparticle suspensions. Applied surface science2008; 255: 2830-2839.


[4] Curran. J.A., Clyne. T.W. Porosity in plasma electrolytic oxide coatings. Acta materialia 2006; 54: 1985-(1993).


[5] Wang changzheng, Zhang Dong, Jiang Yongfeng. Growth process and wear resistance for ceramic coatings formed on Al-Cu-Mg alloy by micro-arc oxidation. Applied surface science 2006; 253: 674-678.


[6] Jin Fanya, Chu Paul. K, Tong Honghui, Zhao Jun. Improvement of surface porosity and properties od alumina films by incorporation of Fe micrograins in micro-arc oxidation. Applied surface science 2006; 253: 863-868.