The effects of anion deposition and negative pulse on the behaviours of plasma electrolytic oxidation (PEO)—A systematic study of the PEO of a Zirlo alloy in aluminate electrolytes
作者： Yingliang Cheng , Ting Wang , Shaoxian Li , Yulin Cheng , Jinhui Cao
DOI: 10.1016/J.ELECTACTA.2016.12.115
关键词: Electrolyte 、 Electrode 、 Plasma electrolytic oxidation 、 Chemistry 、 Aluminate 、 Coating 、 Microstructure 、 Organic chemistry 、 Scanning electron microscope 、 Chemical engineering 、 Sintering
摘要: Abstract Plasma electrolytic oxidation (PEO) of a Zirlo alloy has been carried out under pulsed bipolar and unipolar regimes in aluminate electrolytes with the aim to promote better understanding coating formation mechanisms role negative pulse. Real time imaging, optical emission spectroscopy (OES), gas collection, scanning electron microscopy (SEM) assisted energy dispersive X-ray (EDS) diffraction (XRD) have used characterize PEO processes resultant coatings. The results show that anion deposition process significantly affected composition, microstructure coatings plasma discharge behaviour. For formed less incorporation from electrolyte anions, predominant type is energetic penetrating discharges, usually forming pancake structure big internal pores. However, by fast species assistance “soft sparking” or “sintering arcs” occurs when was concentrated electrolytes. occurrence such discharges correlated fact required for process. hydrogen evolution associated pulse during can promoted transportation electrode surface, favoring homogenous more modified types.
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