6061 aluminium was treated by Plasma electrolytic oxidation (PEO) where a new experimental method was introduced: the applied voltage of the PEO process was quickly increased to 486 V by different voltage rise rates (13.5, 27 and 54 V/s). Scanning electrochemical microscopy (SEM) and Energy-dispersive spectrometer (EDS) and X-ray diffraction were performed to investigate the effect of different voltage rise rates on the structure and the distribution of element and the phase composition of coated 6061 aluminium. Electrochemical impedance spectroscopy (EIS) was employed to further research corrosion resistance of PEO coatings. The results show that the corrosion resistance becomes poorer and the compactness of the outer layer becomes worse with the increase of the voltage rate. As the PEO time prolonged, the inner layer of coatings with higher voltage rise rate would be destroyed.
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