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Effect of Nanosized Silicon Dioxide Additive on Plasma Electrolytic Oxidation Coatings Fabricated on Aluminium
Huang, Zhi-quan1; Wang, Rui-qiang2; Zhan, Heng3; Shen, Xiao-jie4; Zhang, Xu-zhen1; He, Yang5; Huang, Chen5; Shen, De-jiu1; Li, Da-Long6
2020-11-01
摘要Plasma electrolytic oxidation (PEO) of AA1060 aluminium was carried out in aluminate electrolytes to develop corrosion-resistant coatings. Different concentrations (0, 2 and 4 g/L) of a SiO2 nanoparticle (n-SiO2) additive and different treatment times of 15 min and 30 min were employed in this investigation. The PEO coatings were characterized by using a scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion resistances of each coating was evaluated by electrochemical methods. Results showed that n-SiO2 hindered the formation of the alpha-Al2O3 phase and promoted the generation of the gamma-Al2O3 and mullite phases. The addition fo n-SiO(2)in the electrolytes could shorten the breakdown time of PEO, enhance the breakdown voltage, reduce the number of pores in the electrolyte/coating (E/C) interface and enlarge the internal cavity. The coating formed after 15 min in a NaAlO2 solution containing 4 g/L n-SiO2 additive showed the best corrosion resistance, exhibiting the lowest corrosion current density of similar to 8.7 x10(-10) A/cm(2).
关键词Nanosilica Plasma electrolytic oxidation Pure aluminium
DOI10.20964/2020.11.24
发表期刊INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
ISSN1452-3981
卷号15期号:11页码:11191-11202
通讯作者Li, Da-Long(lidalong613@163.com)
收录类别SCI
WOS记录号WOS:000591930300043
语种英语