石墨烯添加剂对微弧氧化陶瓷层耐蚀性能的影响

发布时间：2018-02-05 00:42

本文关键词： 镁锂合金石墨烯微弧氧化耐蚀性　出处：《材料热处理学报》2017年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:By using micro-arc oxidation technology, silicate was used as the main electrolyte component, and a certain amount of graphene additive was added to the electrolyte. A layer of carbon-containing micro-arc oxidation ceramic layer was prepared on the surface of magnesium-lithium alloy. The morphology and thickness of carbon-containing ceramic layer were measured by scanning electron microscope, electron probe and X-ray diffractometer. The results showed that the surface discharge micropore size of the carbon-containing ceramic layer was smaller after the addition of graphene additive. There is no obvious crack initiation and propagation. The total thickness of the ceramic layer is about 17 渭 m, which is mainly composed of Li _ 3mg _ 7T _ (7) and Li _ 3mg _ (17) and MgO, etc. The electrochemical workstation is used. The corrosion resistance of the sample in NaCl solution was studied. The results showed that the carbonaceous ceramic coating had higher corrosion potential and lower corrosion current density in NaCl solution. Its corrosion resistance is obviously improved.
【作者单位】：北京石油化工学院材料科学与工程学院;北京化工大学材料科学与工程学院;
【基金】：北京市自然科学基金资助项目,编号1112011 大学生研究训练计划项目(2015J00034;2015J00037)~~
【分类号】：TG174.453
【正文快照】： 镁锂合金(magnesium-lithium alloy)是在镁基体中添加锂元素,其比重介于1.4~1.6之间,密度较一般镁合金更低,在需要轻量化结构材料的交通、电子、医疗产品等领域展现出广阔的应用前景[1-3]。但由于镁锂合金的腐蚀电位较低、耐蚀性极差,使用前必须进行适当的表面改性处理[4-5]。

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