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利用微弧氧化技术,以硅酸盐为主要电解液成分,并通过在电解液中加入一定量的石墨烯添加剂,在镁锂合金表面制备出一层含碳的微弧氧化陶瓷层。利用扫描电镜、电子探针以及X射线衍射仪等检测了含碳陶瓷层的形貌、厚度、元素含量以及物相组成等。结果表明,加入石墨烯添加剂后制备出的含碳陶瓷层表面放电微孔尺寸较小,且无明显裂纹萌生和扩展。陶瓷层总共厚度约为17μm,主要由Li_3Mg_7、Li_3Mg_(17)和MgO等物相组成。利用电化学工作站,研究了试样在NaCl溶液中的耐蚀性能。其结果表明,含碳陶瓷层在NaCl溶液中有着较高的自腐蚀电位和较低的腐蚀电流密度,其耐蚀性能得到明显的提高。
Using micro-arc oxidation technology, silicate as the main electrolyte component, and by adding a certain amount of graphene additive in the electrolyte, a layer of micro-arc oxidation ceramic layer containing carbon is prepared on the surface of magnesium-lithium alloy. The morphology, thickness, elemental content and phase composition of the carbon-containing ceramic layer were examined by scanning electron microscopy, electron probe and X-ray diffraction. The results show that the surface discharge microcosmic size of carbon-containing ceramic prepared by adding graphene additives is small, and no obvious crack initiation and propagation. The total thickness of ceramic layer is about 17μm, mainly composed of Li3Mg_7, Li3Mg_ (17) and MgO phase. Using electrochemical workstation, the corrosion resistance of the sample in NaCl solution was studied. The results show that the carbon ceramic layer has a higher self-corrosion potential and a lower corrosion current density in NaCl solution, and the corrosion resistance of the ceramic layer is obviously improved.