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首页> 外文期刊>International Journal of Electrochemical Science >Effects of the Graphene Additive on the Corrosion Resistance of the Plasma Electrolytic Oxidation (PEO) Coating on the AZ91 Magnesium Alloy
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Effects of the Graphene Additive on the Corrosion Resistance of the Plasma Electrolytic Oxidation (PEO) Coating on the AZ91 Magnesium Alloy

机译：石墨烯添加剂对AZ91镁合金上等离子电解氧化（PEO）涂层耐蚀性的影响

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Graphene was added into the electrolyte during the preparation of plasma electrolytic oxidation (PEO)coating on the AZ91 Mg alloy. The effects of graphene additive on the surface morphology, phasecomposition and chemical composition of the PEO coating were characterized by scanning electronmicroscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS).Additionally, the effect of the graphene additive on the mechanical property of the PEO coating wasevaluated using micro-hardness tester. Furthermore, the corrosion resistance of the coatings was testedby the potentiodynamic polarization curves and the electrochemical impedance spectroscopy (EIS). Theresults show that the graphene was successfully added into the PEO coating, and the incorporation ofgraphene reduced the number and size of micro-pores and cracks in the coating. Compared with theAZ91 Mg substrate, the micro-hardness of the PEO coating increased more than 15 times, and thecorrosion current density decreased about three orders of magnitude when the amount of grapheneaddition in the electrolyte was 250 mg/L.
机译：在AZ91 Mg合金上进行等离子电解氧化（PEO）涂层的过程中，将石墨烯添加到电解质中。通过扫描电子显微镜（SEM），X射线衍射（XRD）和X射线光电子能谱（XPS）表征了石墨烯添加剂对PEO涂层的表面形态，相组成和化学组成的影响。使用显微硬度计评估了石墨烯添加剂对PEO涂层力学性能的影响。此外，通过电位动力学极化曲线和电化学阻抗谱（EIS）测试了涂层的耐腐蚀性。结果表明，石墨烯已成功添加到PEO涂层中，而石墨烯的掺入减少了涂层中微孔和裂纹的数量和大小。当电解质中石墨烯的添加量为250 mg / L时，与AZ91 Mg基材相比，PEO涂层的显微硬度提高了15倍以上，腐蚀电流密度降低了约三个数量级。

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