孙乐,马颖,李奇辉,王晟,王占营.纯镁表面等离子体电解渗硼与微弧氧化复合膜的制备及耐蚀性[J].表面技术,2021,50(6):64-76.
SUN Le,MA Ying,LI Qi-hui,WANG Sheng,WANG Zhan-ying.Fabrication and Corrosion Resistance of Hybrid Coatings on Pure Magnesium by Combining Plasma Electrolytic Boronizing with Micro-arc Oxidation[J].Surface Technology,2021,50(6):64-76 |
| 纯镁表面等离子体电解渗硼与微弧氧化复合膜的制备及耐蚀性 |
| Fabrication and Corrosion Resistance of Hybrid Coatings on Pure Magnesium by Combining Plasma Electrolytic Boronizing with Micro-arc Oxidation |
| 投稿时间：2021-04-08 修订日期：2021-06-09 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.006 |
| 中文关键词: 镁 等离子体电解渗硼 微弧氧化 表面改性 复合膜 耐蚀性 |
| 英文关键词:magnesium plasma electrolytic boronizing micro-arc oxidation surface modification hybrid coating corrosion resistance |
| 基金项目:甘肃省创新研究群体计划(1111RJDA011) |
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| Author | Institution |
| SUN Le | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| MA Ying | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| LI Qi-hui | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| WANG Sheng | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| WANG Zhan-ying | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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| 中文摘要: |
| 目的 在纯镁表面制备新型复合膜，以提高其耐蚀性。方法 先在硼砂系电解液中对纯镁进行等离子体电解渗硼(PEB)处理，预制表面改性层，然后在硅酸盐系电解液中对其进行微弧氧化(MAO)处理，从而获得PEB+MAO新型复合膜。分别使用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)分析膜层的微观结构、元素分布及物相组成，膜层的耐蚀性则通过动电位极化曲线和电化学阻抗谱(EIS)来表征。结果 纯镁的等离子体电解渗硼过程经历了电离、置换、吸附和扩散四个阶段，获得的PEB表面改性层由氧化层和扩散层组成。在PEB+MAO复合膜的生长过程中，膜层在其厚度方向存在重叠的现象，而不是逐层的简单堆积。等离子体电解渗透时，硼元素渗入后所形成的渗层区域降低了纯镁基体表面的化学活性，改善了其微观组织结构，进而使PEB+MAO复合膜的腐蚀电流密度较基体、单一PEB改性层和单一微弧氧化膜层分别降低了3、2、1个数量级。同时，EIS研究也表明，PEB+MAO复合膜可以提供相对较长时间的抗蚀保护。另外，分析了PEB表面改性层的生成机理以及PEB+MAO复合膜的形成过程，并建立了物理模型。结论 PEB预处理会显著影响PEB+MAO复合膜的厚度、致密性及成分，继而明显提高纯镁的耐蚀性。该新型的复合膜制备方法有望进一步推广到镁合金上，以提高其耐蚀性和承载能力。 |
| 英文摘要: |
| The aim of the research is to prepare a novel hybrid coating on the surface of pure magnesium to improve its corrosion resistance. Pure magnesium was pretreated by plasma electrolytic boronizing (PEB) in borax aqueous solution to obtain the surface modified layer, and then it was processed by micro-arc oxidation (MAO) in silicate-based aqueous solution to fabricate the PEB+MAO novel hybrid coating. The microstructure, element distribution and phase composition of the coatings were analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD), respectively. The anti-corrosion resistance of the coatings was characterized by potentiodynamic polarization curve and electrochemical impedance spectroscope (EIS). The results show that the PEB process of pure magnesium involves four stages, namely ionization, replacement, adsorption and diffusion. The obtained PEB surface modified layer consists of the oxide layer and the diffusion layer. During the growth of the PEB+MAO hybrid coating, instead of simple stacking of layers, overlapping is observed in its thickness direction. In the process of plasma electrolytic saturation, B element infiltrates and forms a layer that reduces the surface chemical activity of pure magnesium substrate but improves its microstructure, thus bringing the corrosion current density of the PEB+MAO hybrid coating down by 3, 2 and 1 orders of magnitude compared with the substrate, single PEB modified layer and single MAO coating, respectively. Meanwhile, according to EIS analysis, the PEB+MAO hybrid coating can provide relatively longer corrosion protection. In addition, the mechanism of formation of PEB surface modified layer and the PEB+MAO hybrid coating is also analyzed, and the physical models are built. In summary, PEB pretreatment has a dramatic effect on the thickness, compactness and chemical composition of the PEB+MAO hybrid coating, thus significantly enhancing the corrosion resistance of pure magnesium. This method for fabrication of the novel hybrid coating is expected to be further applied to magnesium alloys to improve its anti-corrosion ability and bearing capacity. |
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