Investigation and characterization of the plasma electrolytic oxidation of zirconium alloy: effect of negative duty cycle
Applied Physics A(2022)
摘要
In this investigation, the effect of negative duty cycle on the morphology and abrasion and corrosion resistance properties of plasma electrolytic oxidation (PEO)-induced coating on Zr–1%Nb alloy was investigated. X-ray diffraction (XRD), transmission electron microscopy (TEM) with electron diffraction pattern (EDP) method and scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) corrosion and pin-on-disc tests were used to examine the structure and morphology of the coatings. A dense and homogenous structure of PEO coating under negative duty cycle conditions was fabricated that included compounds of crystalline and amorphous nanostructures with fewer nanopores. The results showed that the m-ZrO 2 and t-ZrO 2 were dominant phrases. Also, the corrosion resistance properties of all PEO layers with various conditions were significantly improved. The PEO layer formed with 20% negative duty cycle and the frequency of 1 kHz showed superior corrosion resistance, which could be attributed to its pore-free morphology. The abrasion resistance of the PEO layer at a higher frequency of 4 kHz was about 0.63 which was indicated improvement of abrasion behavior. In addition, the weight loss rate for the PEO layer with the 20% negative duty cycle was about 0.0002 g. The results demonstrated that the using of 1 kHz frequency and 20% negative duty cycle led to the formation of the PEO layer on the surface of Zr–1%Nb alloy with supreme corrosion and abrasion resistance properties.
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关键词
Plasma electrolytic oxidation, Zirconium alloy, Negative duty cycle, Corrosion, Abrasion
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