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Effects of ultrasound on the evolution of plasma electrolytic oxidation process on 6061Al alloy
Dejiu Shen1, Donglei He1, Fangfei Liu2
1State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Abstract:
The plasma electrolytic oxidation (PEO) process of 6061Al alloy was carried out under the conditions with and without the assistance of ultrasound, respectively. The effects of ultrasound on the evolution of voltage, micro-discharge, morphology and composition of PEO coatings were investigated. The results show that ultrasound can greatly decrease the dielectric breakdown voltage of the coatings, increase the number of micro-discharges while decrease their average size, promote the evolution of micro-discharges, decrease the number and the average size of residual discharge pores in the coatings after 30min of the process, promote the homogeneous distribution of elements and the formation of α-Al2O3 and 3Al2O3⋅2SiO2 in the coatings.
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