The incorporation mechanism of colloidal TiOnanoparticles and their effect on properties of the coatings grown on 7075 Al alloy from silicate-based solution using plasma electrolytic oxidation
The incorporation mechanism of colloidal TiOnanoparticles and their effect on properties of the coatings grown on 7075 Al alloy from silicate-based solution using plasma electrolytic oxidation作者机构：Yekta Mobaddel Pars Co.， Science and Technology Campus， Yazd University Department of Materials Engineering， Isfahan University of Technology Dipartimento di Ingegneria， Università di Palermo
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报(英文版))
年 卷 期：2021年
核心收录：
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：Al alloy Al O -TiO coating Plasma electrolytic oxidation Potassium titanyl oxalate Corrosion resistance
摘 要：Plasma electrolytic oxidation (PEO) was applied using a pulsed unipolar waveform to produce AlO-TiOcomposite coatings from sol electrolytic solutions containing colloidal TiOnanoparticles. The sol solutions were produced by dissolving 1， 3， and 5 g·Lof potassium titanyl oxalate (PTO) in a silicate solution. Scanning electron microscopy， energy dispersive spectrometry， X-ray diffraction， and Raman spectroscopy were applied to characterize the coatings. Corrosion behavior of the coatings was investigated using polarization and impedance techniques. The results indicated that TiOenters the coating through all types of micro-discharging and is doped into the alumina phase. The higher level of TiOincorporation resulted in the decrease of surface micro-pores， while the lower incorporation showed a diverse effect. It was revealed that the higher TiOcontent made a more compact outer layer and increased the inner layer thickness of the coating. Electrochemical measurements revealed that the coating obtained from the solution containing 3 g·LPTO exhibited ～ 33 times higher corrosion performance than that obtained in the absence of PTO. The coating produced in the absence of PTO consisted of γ-AlO， δ-AlOand amorphous phases， while α-AlOwas promoted by the presence of PTO.
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